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how battery is charge

shrutihire

but at same time when this switch is off output should low, in that case where should be the switch

shrutihire

@copilot how battery is charge

copilot

Charging a battery typically involves three main stages:

Pre-charge (or Trickle Charge) Stage: If the battery voltage is too low, a low current is applied to the battery to bring it to a minimum threshold voltage.
Constant Current (CC) Stage: The charger supplies a constant current to the battery until the battery voltage reaches the charger’s requirement. This phase ensures that the battery charges quickly but safely.
Constant Voltage (CV) Stage: When the battery reaches its target voltage, the charger switches to a constant voltage mode. The current gradually decreases while the voltage is held constant until the charging current drops to a predefined low value, at which point charging is terminated or maintained with a trickle (float) charge.

The

BQ24610

is a high-efficiency, synchronous switch-mode charger for 1- to 6-cell Li-ion, Li-polymer, and LiFePO4 batteries. Here's a brief about how the

BQ24610

can charge a battery:

Startup Sequence: When a valid input source is connected, the $BQ24610$ checks if the battery is connected and operational.
Pre-charge: If the battery voltage is too low (below a certain threshold), the $BQ24610$ enters the pre-charge stage, providing a small current to the battery to bring it up to a safe level.
Constant Current Charging: Once the battery voltage is above the pre-charge threshold, the device begins supplying a constant current to the battery. The current is set using external resistors and can be adjusted as needed.
Constant Voltage Charging: As the battery voltage approaches the regulation voltage, the charger enters the constant voltage mode. The charge current gradually tapers off.
Termination: When the charge current drops below a specific fraction of the set current, the charger terminates the charging process. If a battery is left connected, the $BQ24610$ periodically restarts the charge cycle if the battery voltage drops.

The connections needed to set up a basic

BQ24610

battery charging circuit are the following:

Connect VCC:24 to the positive terminal of the power supply.
Connect GND:17 and EPAD:25 to the negative terminal of the power supply.
Connect the battery positive terminal to BATDRV:23.
Connect the battery negative terminal to GND:17.
Connect the current sense resistor between SRP:14 and SRN:13.
Connect suitable resistors to set the charge current and voltage using the ISET1:11, ISET2:15, and VFB:12 pins.

Let me know if you need specific details about connections or configurations for the

BQ24610

charger IC.

shrutihire

how i can insert a switch so that i can control charging status of battery

copilot

To insert a switch to control the charging status of the battery with the

BQ24610

, you can use the CE (Charge Enable) pin. This pin enables or disables the charging process. Here's how you can do it:

Choose a suitable switch: You'll need a simple single-pole, single-throw (SPST) switch. Alternatively, you could use a transistor controlled by a microcontroller or another logic circuit.
Connection:
- One terminal of the switch should be connected to the GND (ground).
- The other terminal should be connected to the CE pin (Pin 4) of the $BQ24610$ via a pull-up resistor. The pull-up resistor ensures that the CE pin is high (charging enabled) when the switch is open.

Example Connection:

CE Pin (Pin 4) to a pull-up resistor (e.g., 10kΩ) which then connects to VCC.
One terminal of the switch to GND.
The other terminal of the switch to the CE Pin (Pin 4).

Steps in Flux:

Insert Resistor: Place a 10kΩ pull-up resistor between CE (Pin 4) and VCC (Pin 24).
Insert Switch: Place an SPST switch between CE (Pin 4) and GND (Pin 17).

Detailed Connections:

Connect CE:4 to one terminal of a 10kΩ resistor.
Connect the other terminal of the 10kΩ resistor to VCC:24.
Connect one terminal of the switch to CE:4.
Connect the other terminal of the switch to GND:17.

When the switch is open, the CE pin is pulled high, enabling the charging process. When the switch is closed, the CE pin is connected to GND, disabling the charging process.

Schematic Snippet:

Plaintext
    VCC (24)
      |
      |
     $$10kΩ$$
      |
      |---- CE (4)
      |
    -----
    |   |
  Switch
    |   |
    -----
      |
    GND (17)

Feel free to adjust the resistor value based on your circuit design needs. Using a pull-up resistor is important to ensure the CE pin is in a known state when the switch is open.

shrutihire

but at same time when this switch is off output should low, in that case where should be the switch

copilot

If you want the output to go low when the switch is turned off, you can use a transistor as a switch. A P-channel MOSFET would be a good choice to disconnect the battery charging circuit when the switch is off.

Here’s a detailed way to connect a P-channel MOSFET to control the charging status of the battery:

Choose a P-channel MOSFET: It should have an appropriate current and voltage rating suitable for your battery charging needs.
Connections with MOSFET:
- Source to the positive power supply $V_{CC}$ .
- Drain to the BATDRV pin.
- Gate to ground through a pull-down resistor.
- Connect the switch between the Gate and $V_{CC}$ .

When the switch is closed, it will turn off the P-channel MOSFET by pulling the Gate to

V_{CC}

. When the switch is open, the pull-down resistor will pull the Gate to ground, turning on the MOSFET and enabling the battery charging.

Example Connection in Flux:

Source of the P-channel MOSFET to BATDRV:23.
Drain of the P-channel MOSFET to the positive terminal of the battery.
Gate to ground through a pull-down resistor (e.g., 10kΩ).
The switch is connected between the Gate and $V_{CC}:24$ .

Detailed Connections:

Connect BATDRV:23 to the Source pin of the P-channel MOSFET.
Connect the Drain pin of the P-channel MOSFET to the positive terminal of the battery.
Connect the Gate pin of the P-channel MOSFET to one terminal of a 10kΩ resistor.
Connect the other terminal of the 10kΩ resistor to GND:17.
Connect one terminal of the switch to the Gate pin of the P-channel MOSFET.
Connect the other terminal of the switch to $V_{CC}:24$ .

Schematic Snippet:

Plaintext
   VCC (24)
      |
     -----
     |   |
  Switch
     |   |
     -----
      |
    Gate (P-MOSFET)
      |
    10kΩ
      |
    GND (17)

    Source (P-MOSFET) ---- BATDRV (23)
    Drain (P-MOSFET) ---- Battery+

Operation:

When the switch is open, the Gate is pulled to ground, turning on the P-channel MOSFET and enabling the battery charging circuit.
When the switch is closed, the Gate is pulled to $V_{CC}$ , turning off the P-channel MOSFET, disconnecting BATDRV, and stopping the charging process.

This method effectively controls the charging status with a switch, making sure the output goes low when the switch is off.

shrutihire

at what point power will given to load

copilot

In a battery charging circuit, especially one controlled by the

BQ24610

, the connection point for supplying power to the load is crucial. Typically, power can be supplied to the load either directly from the battery or through the charger's power path, depending on the system design and requirements.

Here’s how power is commonly supplied to the load:

Power Path Management

Direct Battery Load Connection (Primary Scenario):
- This is the simplest and most common method. The load is connected directly to the battery terminals.
- When the charger is operating, it charges the battery and supplies power to the load simultaneously.
Connection:
- Connect the positive terminal of the battery to the load's positive input.
- Connect the negative terminal of the battery to the load's negative input.

Adding a Load Switch

If you want to control when power is given to the load (e.g., turning it off when charging begins) and ensure a seamless power path, you might want to use a MOSFET load switch or a similar switching mechanism. Here’s how you can integrate this:

Using a P-channel MOSFET Load Switch:
- The P-channel MOSFET can be used to disconnect the load from the battery during certain conditions, such as when charging is stopped.

Detailed Connections:

Source of the P-channel MOSFET connected to the positive terminal of the battery.
Drain of the P-channel MOSFET connected to the load's positive input.
Gate to ground through a pull-down resistor (e.g., 10kΩ).
Connect the control switch between the Gate and VCC (or other control logic to enable/disable the load).

Example Connection:

Connect the negative terminal of the battery to the load's negative input.
Source of the P-channel MOSFET to the battery's positive terminal.
Drain of the P-channel MOSFET to the load's positive input.
Gate of the P-channel MOSFET to ground through a 10kΩ pull-down resistor.
Connect a control switch (or a microcontroller pin, etc.) between the MOSFET's Gate and VCC.

When the Load Switch is Controlled:

When the control signal (or switch) is turned on, the Gate is pulled to $V_{CC}$ , turning off the MOSFET and disconnecting the load.
When the control signal (or switch) is turned off, the Gate is pulled to ground, turning on the MOSFET and connecting the load to the battery.

Schematic Snippet:

Plaintext
    Battery+
       |
       |---- Source (P-MOSFET)
       |
    Drain (P-MOSFET) ---- Load+
       |
      Gate
       |
    10kΩ
       |
    GND

    Control/Control Switch ---- MOSFET Gate and VCC

Load Directly from the Charger Output:

In a more integrated configuration, loads can be connected to the same node as BATDRV (or similar). This approach ensures the load gets power from the charger directly when the charger is connected and from the battery when the charger is not connected.

Simplified Scenario:

If you don’t need complex control over when the load receives power and just want a simple setup where the load is always powered when the battery is connected:

Connect the load in parallel with the battery.

Final Connections:

Connect the load's positive input to the battery's positive terminal.
Connect the load's negative input to the battery's negative terminal.

This will ensure the load is powered either by the charger (when charging) or by the battery (when not charging).

Choose the approach that best fits your application needs. If control is not vital, a direct connection is the simplest and most efficient. If control is necessary, using MOSFETs will provide the flexibility needed.

shrutihire

make a configuration such that i have to use only switch, when switch is turn on battery should start charging and load should supply from external supply source, when switch is off vout should low , and when external supply is removed then load should supllied with battery

copilot

To achieve the desired configuration where:

The switch controls whether the battery charges and whether the load is supplied from the external power source or battery.
When the switch is turned on, the battery charges, and the load is supplied from the external power source.
When the switch is turned off, the output should be low.
When the external power supply is removed, the load should be supplied by the battery.

You can use a combination of a switch, a diode or MOSFET for automatic switching between external power and battery, and control the charging enable pin of the

BQ24610

Configuration Summary

Switch controls the Charge Enable (CE) pin.
Use a Schottky diode for automatic switching between external power and battery.
Power to load is managed using a P-channel MOSFET or relay.

Here's how to do it:

Components

SPST Switch
P-Channel MOSFET
Schottky Diode (e.g., 1N5819)
Resistors (10kΩ for pull-down)
$BQ24610$ IC

Connections:

Controlling CE:
- Use the switch to control the CE pin of the $BQ24610$ .
- When the switch is on, the CE pin is pulled high (charging enabled).
- When the switch is off, the CE pin is pulled low (charging disabled).
Power Supply Selection:
- Use a Schottky diode to automatically switch between external power and battery.
- Use a P-channel MOSFET to control whether the load is powered by the external power or battery, based on the switch status.

Detailed Connections:

Switch and CE Pin:
- Connect one terminal of the switch to VCC.
- Connect the other terminal of the switch to CE.
- Add a pull-down resistor between CE and GND to ensure it goes low when the switch is off (10kΩ).
External Power Supply and Battery Connection:
- Connect the external power supply positive to the Source pin of the P-channel MOSFET.
- Connect the Source pin of the P-channel MOSFET to the anode of a Schottky diode.
- Connect the cathode of the Schottky diode to the positive terminal of the battery.
Load Connection:
- Connect the Drain pin of the P-channel MOSFET to the load's positive input.
- Connect the load's negative input directly to the battery's negative terminal.
- Add another Schottky diode between the Source pin of the MOSFET and the load to protect against reverse current when the external power is disabled.
MOSFET Gate Control:
- Connect the Gate pin to GND through a pull-down resistor (10kΩ).
- Connect a pull-up resistor (10kΩ) between the Gate pin and the external power supply positive.

Operation:

When the switch is ON:
- CE pin is high, enabling the charger.
- The external power supply powers the load via the P-channel MOSFET.
- The battery is charging.
When the switch is OFF:
- CE pin is low, disabling the charger.
- The P-channel MOSFET is turned off by the pull-down resistor, disconnecting the external power from the load.
- The load is not powered (Vout is low).
When the external supply is removed:
- The Schottky diode allows the battery to supply power to the load.

Schematic Snippet:

Plaintext
    External Supply
          |
          |
         / \
        |   | -- Anode ---- P-Channel MOSFET (Source)
         \ /                    |
          |                     |
        Load+-----------------Drain
          |                     |
          |                     |
         \ /                    |
        |   | -- Cathode ------ Battery+
         / \                    |
          |                     |
    Battery- ------------------ Load-

   Switch
     | 
    CE Pin --pull-down 10kΩ-- GND
     |
    VCC

Summary of Key Connections:

Connect Switch terminal 1 to VCC.
Connect Switch terminal 2 to CE.
Connect CE to GND via a 10kΩ pull-down resistor.
Connect External Supply Positive to Source of P-Channel MOSFET.
Connect Source of P-Channel MOSFET to Anode of Schottky Diode.
Connect Cathode of Schottky Diode to Battery+.
Connect Drain of P-Channel MOSFET to Load+.
Connect Load- to Battery-.
Connect Gate of P-Channel MOSFET to GND via 10kΩ pull-down resistor.
Connect Gate of P-Channel MOSFET to External Supply Positive via 10kΩ pull-up resistor.
A separate Schottky Diode from Source to Load+ can protect against reverse current.

With this setup, the switch will effectively control the charging process and power supply to the load based on the described conditions.

shrutihire

that external supply means supply comming to DPPM ic throught adapter which is of 28 v and battery is of 12v

copilot

Given that your external supply is from an adapter providing 28V and your battery is 12V, we need to design the circuit accordingly. Here’s an updated configuration using a switch, where:

Turning the switch ON enables battery charging and powers the load from the adapter.
Turning the switch OFF disables charging, and the load’s output is low.
If the adapter supply is removed and the switch is ON, the load will then be powered by the battery.

Components

SPST Switch
P-Channel MOSFET (suitable for 28V and required current)
Schottky Diode (e.g., 1N5819)
Resistors (10kΩ for pull-down and pull-up)
$BQ24610$ IC

Connections Overview

Switch to control the Charge Enable (CE) pin.
Use a Schottky diode for automatic switching between external power and battery for the load.
Control the power to the load using a P-channel MOSFET or relay.

Connection Steps:

Controlling the CE Pin:
- Use the switch to control the CE pin of the $BQ24610$ .
- When the switch is ON, CE pin is pulled high (charging enabled).
- When the switch is OFF, CE pin is pulled low (charging disabled).
Power Supply Selection:
- Use a Schottky diode for automatic switching between the adapter and the battery.
- Use a P-channel MOSFET (PQ1) to control whether the load is powered by the adapter or the battery.

Detailed Connections:

Switch and CE Pin:
- Connect one terminal of the switch to VCC (from the adapter).
- Connect the other terminal of the switch to CE (pin 4 of $BQ24610$ ).
- Add a pull-down resistor (10kΩ) between CE and GND (pin 17 of $BQ24610$ ).
Power Supply to Battery and Load:
- Connect the adapter (28V) positive terminal to the Anode of Schottky Diode (D1).
- Connect the Cathode of Schottky Diode (D1) to the Source of P-channel MOSFET (PQ1).
- Connect the Source of PQ1 to $VCC$ (pin 24 of $BQ24610$ ).
- Connect the Drain of PQ1 to the positive terminal of the battery (Battery+).
Battery and Load Connections:
- Connect the Source of PQ2 (P-channel MOSFET) to Battery+ (same as the drain of PQ1).
- Connect the Drain of PQ2 to Load+.
- Connect Load- to Battery-.
- Connect the Gate of PQ1 to GND through a pull-down resistor (10kΩ).
- Connect the Gate of PQ1 to the adapter's positive terminal via another resistor (10kΩ pull-up).
- Connect the Gate of PQ2 to GND through a pull-down resistor (10kΩ).
- Connect the Gate of PQ2 to the adapter's positive terminal via another resistor (10kΩ pull-up).

This arrangement allows the PQ1 MOSFET to manage the charging and load power supply from the adapter or battery as required.

Schematic Snippet:

Switch to Control CE (Charging Enable):

Plaintext
  Adapter+
      |
      |--- Switch (SPST)
      |       |
     CE Pin   |
 (pin 4 of    ---
 $$BQ24610$$)  |
      |        |
  10kΩ Pull-  GND
    Down

External Power Supply and Battery Connection:

Plaintext
  Adapter+
      |
     / \
    |   | -- Anode -------> P-channel MOSFET PQ1 (Source)
     \ /
      |
  Battery+
      |
     / \
    |   | -- Cathode ------ PQ1 (Drain)
     \ /                     |
      |                     |
     Drain                Source
     PQ1                   PQ2
      |                     |
    Load+-----------------Drain
      |                     |
      |                     |
     \ /                   \ /
    |   |                Battery+
    Schottky Diode          |
                          Battery-

MOSFET Gate Control:

Plaintext
  Adapter+
      |
     10kΩ
      |
 Gate PQ1
      |
    GND
          |
     10kΩ
      |
 Gate PQ2
      |
    GND

Operation Summary:

Switch ON (both CE pin high, charging enabled, and load supplied from the adapter):
- PQ1 is turned on, providing power from the adapter to the $BQ24610$ .
- PQ2 is turned off, preventing direct battery discharge to the load as long as the adapter is present.
- Battery is charging and the load is receiving power from the adapter.
Switch OFF (CE pin low, charging disabled, and load power disconnected):
- PQ1 is turned off, disabling the adapter power to the $BQ24610$ and the battery.
- Vout is low since PQ2 is also off.
External Adapter Removed (and switch ON):
- Schottky diode (D1) conducts, and voltage drop switches the load to battery power automatically.
- PQ2 is turned on, allowing the battery to power the load when the adapter power is absent.

By following this configuration, you can efficiently manage the power distribution between charging the battery, supplying power to the load from the adapter, or switching to battery power if the adapter is removed.

shrutihire

draw undersatndable circuit diagram

copilot

Here's the corrected text:

Circuit Diagram

Below is the complete diagram with clear connections:

Plaintext
                     ---------------------
                    |        Adapter      |
                    |      (+28V, GND)    |
                     ---------|-----------
                              |
               +28V           |
                |             |
               / \       Schottky Diode
              |   |      $(D1:1N5819)$
              \ /           |
                |           |
               --------------
               |            / \
               |           |   |-------|
              10kΩ         \ /        | | Source$(PQ1)$
               |           |         |
              Gate 1     Anode     Drain
               |           |         |
     GND-------|          Load+--- Load- $(GND)$
              Gate 2
               |           |
              10kΩ       Schottky Diode
               |           $(D2:1N5819)$
     GND-------|           |
              CE pin       |
             $(Pin 4)$       |
              |           Battery+
            Switch        12V Battery
              |           |
             VCC         Battery-
            $(+28V)$        $(GND)$

In this diagram:

Key Components:

Switch Control:
- SPST Switch connected to CE $(Pin 4)$ of the $BQ24610$
- 10kΩ Pull-down resistor to keep CE grounded when the switch is off
Power Path Management:
- Schottky Diodes $(D1$ and $D2$ $1N5819)$ are used for automatic switching
- P-Channel MOSFETs $(PQ1$ and $PQ2)$ for power management

Operation Summary:

Switch ON:
- The CE pin is pulled high, enabling the charger
- Load is powered from the adapter through $PQ1$
- Battery is charging
Switch OFF:
- The CE pin is pulled low, disabling the charger
- $PQ1$ is turned off, disconnecting the load from the adapter
- $Vout$ is low
External Adapter Removed:
- Schottky diode $D2$ allows the battery to power the load if the adapter is not present and the switch is ON

Detailed Schematic Snippet for Each Connection:

Switch Control:
- Connect VCC (28V) to one terminal of the SPST switch
- Connect the other terminal of the switch to CE $(Pin 4)$ of $BQ24610$
- Connect CE $(Pin 4)$ to ground via a 10kΩ pull-down resistor
Power Supply Control:
- Connect the External Adapter (+28V) to the Anode of Schottky Diode $(D1)$
- Connect the Cathode of $D1$ to Source of P-Channel MOSFET $(PQ1)$
- Connect the Drain of $(PQ1)$ to BATDRV$(Pin 23)$ + Load+
- Connect the Gate of $PQ1$ via 10kΩ resistor to ground and another 10kΩ resistor to Adapter+
Battery Connections:
- Connect the positive terminal of the battery to the Drain of $PQ1$ (and Load+)
- Connect the negative terminal of the battery to Load-

By following this clear schematic, you’ll be able to manage the charging and power supply to the load as required using only a switch to control the charge enable pin of the

BQ24610

shrutihire

Image

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copilot

To achieve your requirements using the application circuit of the

BQ24610

, we need to integrate a switch and some diodes for power path control. Specifically:

When the switch is ON:
- The battery starts charging.
- The load is supplied from the external adapter.
When the switch is OFF:
- The battery charging is disabled.
- The output to the load should be low.
When the external supply is removed:
- The load is powered by the battery.

In the provided application diagram, the important connections are the ACDRV (Adapter Control), BATDRV (Battery Drive), VCC, and GND pins. Let's integrate the switch and the diodes into this setup.

Key Components:

SPST Switch
Schottky Diodes (e.g., 1N5819)
P-Channel MOSFET (optional depending on exact power requirements but recommended)

Integrations: Switch and CE Control:

Connect the SPST switch:
- One terminal of the switch goes to VCC (Adapter +28V).
- The other terminal goes to CE (Pin 4) of the $BQ24610$ .
- A 10kΩ pull-down resistor should be placed between the CE pin and GND.

Automatic Power Path Control:

Schottky Diode for Battery to Load Path:
- Connect the cathode of the Schottky diode to the VCC line from the adapter.
- Connect the anode of the Schottky diode to BATDRV (which goes to the battery positive terminal).
Diode for Load Protection:
- Connect another Schottky diode (D2):
  - The anode to the battery positive terminal.
  - The cathode to the load's positive input.

P-Channel MOSFET for Load Power Switching:

Source of the P-Channel MOSFET goes to the adapter's positive terminal.
Drain of the P-Channel MOSFET goes to the load's positive input.
Gate of the P-Channel MOSFET can be controlled by the voltage from the adapter through a resistor (to ensure proper switching when the adapter is plugged in).

Here is how the integration fits into the provided application circuit:

Illustrated Connections: 1. CE Control (Enable/Disable Charging):

Plaintext
  VCC (+28V)
     |
     |
   -----
   |   |
   | Switch |
   |   |
   -----
     |
     |
    CE (Pin 4 of BQ24610)
     |
  10kΩ
     |
   GND

2. Power Path Control:

Plaintext
 External Adapter (+28V)
     |
    / \
   |   |
   \ / Schottky
     | Diode (D1)
     |
     |------- Source (P-MOSFET PQ1)
     |
    Load+ ------------------|
                |        Drain (PQ1)
                |
               / \
 Load          |   | Schottky
    +        Anode \ /       Diode (D2)
----------------| |
Battery+        |
________________|

Battery-

Simplified Schematic Showing All Connections:

Plaintext
External Adapter (+28V)
        |
    -----------
    |         |
    |         |------ Schottky Diode (D1)
    |         |      (Anode to BATDRV, Cathode to Adapter +28V)
    |         |
    |
Source (P-MOSFET PQ1)
         |
       Drain ------------- Load+
         |
Load's  positive Terminal
         |
       Schottky
         Diode (D2)
        (Cathode to Load+, Anode to Battery+)
         |
      Battery+
      (12V Battery)
         |
      Battery-
         |
        GND

Circuit Operation:

Switch ON:
- CE Pin is pulled high, enabling the charger.
- PQ1 is turned on (as Gate is pulled low by the adapter voltage), supplying power from the adapter to the load.
- The battery starts charging via the $BQ24610$ .
Switch OFF:
- CE Pin is pulled low, disabling the charger.
- PQ1 is turned off, disconnecting the load from the adapter.
- Vout is low as current to the load is prevented.
When the External Adapter is Removed:
- Schottky Diode (D2) automatically allows the battery to supply power to the load.

This setup ensures seamless power management where a simple switch controls battery charging and automatic switching from adapter to battery power.

shrutihire

so many things you told was wrong, when ce pin is low how battery will not charge cause non of the termianl of battery is coinnected to IC

shrutihire

so many things you told was wrong, when ce pin is low how battery will not charge cause non of the termianl of battery is coinnected to IC?

copilot

To address your requirements more accurately, let's directly work with the provided

BQ24610

application circuit and integrate the switch and diode logic to control the charging and load functionality as specified.

Revised Strategy:

CE Pin Control via Switch:
- When the switch is ON, the CE pin is activated and the IC starts charging the battery.
- When the switch is OFF, the CE pin is deactivated, stopping the battery charging.
Power Path Control:
- When the external adapter (28V) is present, it supplies power to the system.
- When the adapter is removed, the battery supplies power to the system.
- Ensure that output is low when the switch is off.

Updated Components:

SPST Switch
Schottky Diodes (e.g., 1N5819)
P-Channel MOSFET (to control the power path to the load)

Integrating with the Existing Application Circuit:

Switch Control for CE Pin:
- Use the SPST switch to control the CE (Pin 4) pin.
- When the switch is ON, the CE pin is pulled high (charging enabled).
- When the switch is OFF, the CE pin is pulled low through a pull-down resistor (charging disabled).
Power Path Control using P-Channel MOSFET and Schottky Diodes:
- Use diodes to ensure proper direction of current flow.
- Use a P-Channel MOSFET to control power to the load based on the presence of the external adapter.

Detailed Connections:

Switch and CE Control:
- Connect one terminal of the switch to the 28V supply (Adapter).
- Connect the other terminal of the switch to the CE pin (Pin 4) of the $BQ24610$ .
- Connect a 10kΩ pull-down resistor between the CE pin and GND to ensure it is low when the switch is off.
Power Path Control:
- Schottky Diode D1: Connect the external adapter's positive terminal to the cathode of D1, and the anode of D1 to the ACDRV pin (Pin 3) of $BQ24610$ .
- P-Channel MOSFET for Load:
  - Source to the adapter’s positive terminal.
  - Drain to the load's positive input.
  - Gate controlled through a resistor from the adapter.
- Schottky Diode D2: Connect the battery's positive terminal to the load's positive input to manage automatic switching.

Simplified Schematic Integration: 1. Switch to Control CE:

Plaintext
28V Adapter
   |
 SPST Switch
   |
  CE Pin
(pin 4 of BQ24610)
   |
  10kΩ
   |
  GND

2. Power Path Control with Diodes and MOSFET:

Plaintext
External Adapter (+28V)
        |
       / \
      |   | Schottky Diode (D1)
      \ /
        |
      ACDRV (Pin 3 of BQ24610)
        |
      Source (P-MOSFET PQ1)
        |
      Drain ------------- Load+
        |
     Load positive terminal
        |
     Schottky Diode (D2)
      \ /
      |    Anode to Battery+
      |       (12V Battery)
      |
  Battery positive terminal
      |
  Battery negative terminal
      |
     GND

Detailed Schematic:

Plaintext
                            Adapter
+28V-----o----------------------+
        |                       |
       10kΩ                     | 
        |                       |
    CE (Pin 4)           Source (PQ1)
       / \                     / 
      | Sw |--------------------------|-----------------------o: System
       \( \                            |                     Load+
        |                              |  
       GND                            Drain
                                        |
                                    Schottky
                                    Diode (D2)
                                      \ / 
                                       |                             
                                    Battery+
                                       |
                                   Battery- (GND)

This circuit ensures the following:

When the switch is ON:
- CE Pin is pulled high, enabling the charger.
- P-channel MOSFET (PQ1) turns on, providing power from the adapter to the load.
- The battery is charging through the $BQ24610$ .
When the switch is OFF:
- CE Pin is pulled low, disabling the charger.
- PQ1 is turned off, disconnecting the load from the adapter.
- Vout is low.
When the external adapter is removed:
- Schottky Diode (D2) conducts, allowing the battery to supply power to the load automatically.

This revised configuration addresses your requirements accurately with minimal components and integrates cleanly with the existing

BQ24610

application circuit.

copilot

I apologize for any confusion caused. Let me revise the explanation and make it clearer for you with the correct approach.

Objectives:

Switch ON:
- The battery starts charging.
- The load is supplied from the external adapter.
Switch OFF:
- The battery charging is disabled.
- The output to the load should be low.
External Supply Removed:
- The load is powered by the battery.

Key Components:

SPST Switch
Schottky Diodes (e.g., 1N5819)
P-Channel MOSFET (optional for load control)

Setup with the Given Application Circuit: Integrations:

Switch and CE Control:
- The CE pin of the $BQ24610$ controls whether charging is enabled.
- Use the SPST switch to control the CE pin.
Automatic Power Path Control:
- Use Schottky diodes for automatic switching between the external adapter and the battery.
- Use a P-channel MOSFET to control the power to the load.

Configuration Steps:

Control Charging via CE Pin:
- Connect one terminal of the switch to VCC (through a pull-up resistor).
- Connect the other terminal of the switch to CE (Pin 4) of the $BQ24610$ .
- Connect CE Pin 4 to GND using a 10kΩ pull-down resistor.
Power Path Management using Diodes and MOSFETs:
- Connect the external adapter (28V positive terminal) to the anode of a Schottky diode (D1).
- Connect the cathode of D1 to the positive terminal of the battery (BAT+).
- **Connect the positive terminal of the battery to the BATDRV pin on the $BQ24610$ (if not already part of the application circuit).
- **Connect the Source of a P-channel MOSFET (PQ1) to the external adapter (28V positive terminal).
- **Connect the Drain of PQ1 to the load’s positive input.
- Connect the Gate of PQ1 to VCC (28V) through a 10kΩ resistor.
- Connect the Gate of PQ1 to GND through another 10kΩ resistor.
- **Connect the negative terminal of the battery (BAT-) and load’s negative input to GND.

Circuit Diagram: 1. Switch for CE Control:

Plaintext
      VCC (28V)
        |
       [ ]   Load+
           |----------------------|
           |                      |
          GND                 Load- ---- GND
         (Battery-)

shrutihire

Go throught its datasheet and see what are the pins function of HIDIV, LOWDIV, PH and how pmos connected to BATDIV and system provides low impedeance path from battery to system

copilot

Let's go through the relevant sections of the

BQ24610

datasheet to understand the functions of the HIDRV, LODRV, PH pins, and how to connect a P-channel MOSFET to provide a low impedance path from the battery to the system.

Pins Functions:

HIDRV (Pin 21):
- High-Side Driver Output. This pin drives the gate of the high-side N-channel MOSFET, which is part of the synchronous buck converter used to regulate the charging current and voltage.
LODRV (Pin 19):
- Low-Side Driver Output. This pin drives the gate of the low-side N-channel MOSFET, which is also part of the synchronous buck converter.
PH (Pin 20):
- Phase Node Connection. This pin connects to the switching node (junction of the high-side and low-side MOSFETs) in the synchronous buck converter. The PH node is where the inductor connects, and it is a key point for power conversion from the adapter to the battery.

Understanding the P-channel MOSFET Integration:

To create a low impedance path from the battery to the system, you generally use a P-channel MOSFET (P-MOS) whose drain is connected to the load (system) and whose source is connected to the battery positive terminal (BAT+). The gate of the P-MOSFET is controlled such that it turns on when the system needs power from the battery. The BATDRV pin can be used to control the gate of the P-MOS.

Path to Low Impedance:

The BATDRV pin (Pin 23) is used to drive the gate of a P-MOSFET.
When the BATDRV pin is low, the P-MOSFET is turned on, allowing current to flow from the battery to the system, providing a low impedance path.
When the BATDRV pin is high, the P-MOSFET is turned off, disconnecting the battery from the system.

Connection Summary:

Source of P-MOSFET: Connect to the battery positive terminal (BAT+).
Drain of P-MOSFET: Connect to the system (load) positive input.
Gate of P-MOSFET: Connect to the BATDRV pin (Pin 23) via a suitable pull-up resistor (to ensure it turns off when not driven).

Detailed Schematic Integration:

Let's refine the schematic focused on providing a low impedance path using the P-MOSFET driven by the BATDRV pin.

Schematic:

Plaintext
            External Adapter (28V)
                   |
                  / \
                 |   | Schottky Diode (D1)
                 \ /
                   | Anode
                   |
                 BATDRV (Pin 23)
         Source (P-MOSFET PQ1)
                   |
                 Drain ---------------> Load+
                   |
                 System
                   |
                  GND 

                 Battery
                  +|
               (BAT+)

Explanation of Connections and Operation:

BATDRV Control:
- BATDRV Pin (Pin 23): This pin will control the gate of the P-channel MOSFET (PQ1).
- Source of PQ1: Connected to the battery positive (BAT+).
- Drain of PQ1: Connected to the load/system positive input.
- Gate of PQ1: Connected to BATDRV, controlled to turn PQ1 on/off.

Step-by-step Function:

Switch ON (Charging Enabled):
- CE pin is pulled high by the switch, enabling charging.
- The battery is charged via the $BQ24610$ .
- The system is powered by the adapter through the synchronous buck converter (HIDRV and LODRV MOSFETs are switching).
Switch OFF (Charging Disabled):
- CE pin is pulled low by the switch, disabling charging.
- BATDRV pin goes low, turning on the P-channel MOSFET (PQ1), connecting the battery to the system.
- The system is disconnected from the adapter, and Vout is low because the power supply path to the system is cut off.
External Adapter Removed:
- When the adapter is removed, the Schottky diode (D1) ensures the current path from the battery through the P-MOSFET (PQ1) to the system.
- BATDRV pin remains low, keeping PQ1 on and allowing the battery to supply power to the system.

Diagram Representation:

Below is a simplified connection diagram that combines your needs:

Plaintext
            External Adapter (+28V)
                  |
 External Supply (VCC) -----|
                  |         |
         Anode / \         / \
       D1       |   |     |   |
                 \ /     / \
                   |      |
               BATDRV (Pin 23 of BQ24610)
Source (P-MOSFET PQ1) -----|
                   |       Anode / \
                Battery+   D2   |   | ----> Load/System Positive
                   |        \ /
                 BAT-V      |

Summary:

Using the above setup, you achieve a low impedance path from the battery to the system ensuring that the P-MOSFET is properly controlled using the BATDRV pin of the

BQ24610

IC. This manages charging when the switch is on, and automatically switches power from the battery to the system effectively when the external adapter is removed.

Someone is typing...

TTC

*PG

VCC

ACSET

*BATDRV

ISET2

GND

VREF

SRN

BTST

STAT2

ACP

EPAD

STAT1

ACN

VFB

ISET1

*ACDRV

LODRV

REGN

SRP

HIDRV

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