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https://cdn2.flux.ai/flux-comment-files/files/commentFileId-36fccc4812a5dd205d40...
jeeva

jeeva

@copilot
Image

Image

https://cdn2.flux.ai/flux-comment-files/files/commentFileId-36fccc4812a5dd205d406669521640a76c2c067f1c3ff52f678214910d93d0b7.png?GoogleAccessId=graviton-mvp%40appspot.gserviceaccount.com&Expires=4864606722&Signature=NNvCwgqhS8NO9T4n6OsgBEL%2B67mUimufXqSNJ1wVDH8sW3ZB94cW93SzCL80a%2BDxON11v1Py%2FS5vxHNTnk7lybKvRa4DM55Mu8%2BghTY2HnS75SdTmfGCxqV4URZFzmBGEO%2BjTSYunr2v%2F0eKXUy5fjoTobVSDmRvtYgf%2F6l%2BWm8e%2BrFeJpIDmaukXDL8IA0h030TuvAIGipZZiUg%2BWBM%2FdIqEPjPgdFVJzXfQ%2Bauh1ohhFjNxjIUeUM804LVvMxkn7j4%2FHtI3Yz2ib2JzATUz5TXXQhwkoq1ym31l%2BSQOj%2FAsTWDjlw9mF3Yvcod3%2BIdJ27S720p82YAI4O1OyPH2Q%3D%3D can you explain this circuit
2y

copilot

Sure, let me explain the circuit depicted in the image.
This is a power circuit with a voltage regulator and a power switching component:
  1. Voltage regulator (U301 - LP5907MFX-3.3):
    • This is a low-dropout regulator (LDO) that outputs a regulated 3.3V from a 5V input supply (VDD 5V IN).
    • The EN (Enable) pin is controlled by VDD 3V3 PERIPH EN signal, which presumably enables or disables the regulator.
    • Pin IN is connected to the input voltage, and pin OUT provides the regulated 3.3V output (VDD 3V3 PERIPH).
    • The GND pin is connected to ground.
    • Capacitors C24 and C22 (both10uF)(both 10uF) are used for input and output decoupling, respectively.
    • Capacitor C23 (100n)(100n) across the output is likely for additional transient response filtering and noise reduction.
  2. Pull-Down Resistor (R26):
    • A 10K resistor (R26)(R26) is connected between the EN pin of the voltage regulator and ground. This ensures that the EN pin is not floating and defaults to a disable state if not actively driven high.
  3. P-channel MOSFET Switch (Q1 - BSS84):
    • The MOSFET is used as a high-side switch controlled by the VDD 3V3 SPEKTRUM signal to allow or block current flow to the SPEKTRUM POWER net.
    • When a logic high is applied to the gate $ (G) $ of the MOSFET (Q1)(Q1), the switch is turned off $ (because it's a P-channel MOSFET) $, then no current flows from the source $ (S) $ to the drain $ (D) $.
    • Conversely, when a logic low is applied to the gate, the switch is turned on, and current is allowed to flow from the source to the drain, powering the SPEKTRUM POWER net.
This configuration is common in electronic circuits where you have a voltage regulator to provide a stable power supply, and a P-channel MOSFET serves as a switch to enable or disable power to a specific part of the circuit. The switching might be controlled by a microcontroller or another logic signal depending on the application needs.
2y
2
https://cdn2.flux.ai/flux-comment-files/files/commentFileId-1214259db45df6d04c5e...
jeeva

jeeva

Image

Image

https://cdn2.flux.ai/flux-comment-files/files/commentFileId-31ac972f33ff75ae8c52050122530658e11ba22f82d977f79c00105e55222288.png?GoogleAccessId=graviton-mvp%40appspot.gserviceaccount.com&Expires=4864604065&Signature=EHiZ%2F4zuqKZcIMCYkVUKyAprVQZbRMy2QwKraYx6xJhHjBeZASAn0ACmrxqMqxy%2BEem5TWkkdH9QccXkCJx227xU9x6hHWmZr%2Fbgomvd43AUInKxFmTd2joA8M7b380CHoASRvyKUj%2BN3%2Bb4MU6t1srBkEsQpTo7AY2wGMAGxbGmuhnRnlW6GO8AgW7eQsceMHFSQZjI1vgYp2KqSBsMMWk09BL4W47ROYc%2BqkDRjRyEEs9lGzA0HqKO7ryUtuS%2F9nDzIdoeVqFlPTEPOlcULJ1fnVLfiXygu9FPpLGeObJaI1Tgr%2BasE0%2FG7HUuBHHUVJmJRe1pFLCy8fBR1KNjJA%3D%3D is this proper connection ? can you explain
2y
jeeva

jeeva

@copilot
Image

Image

https://cdn2.flux.ai/flux-comment-files/files/commentFileId-1214259db45df6d04c5e665a53322d42e6b53e3a300a1d5e4ba42d89b2766d4e.png?GoogleAccessId=graviton-mvp%40appspot.gserviceaccount.com&Expires=4864603245&Signature=JnbhZEoK5E6rpU3CHKdINDGt4CndHs8kxdSSyFP45eGOt1YLgqtoAgnbVtPLxVZcEAt3MBfzTAzanTxirxs3n86y5r%2FeOjyHfW16J0bY5qDT0raor4nI%2BcmPOiM555VCR8MghFYIkiXX7EBbBrzrJS4xAHfCx1G%2Fl0sS0MR%2FRcj0wt4RIPbugxLydmKbilMhqhua09RHgA2QSmLfeSwOCtmaXg5xCPnkrVyCDkmsHOrIfHXQYpeTLk1rZ2epCbO%2FS2N6SuMfWjjHKtJ9w8l2wSfbmE%2FC%2BRH6OKYPpV3XRLpHlb%2BFMXszgNNJZQuM80yswCaDlwcDIOSnUhMBXzwckg%3D%3D can you explain this circuit
2y

copilot

Certainly! The circuit you provided appears to be a USB power input circuit with overcurrent protection, overvoltage protection, status indication, and two separate power output rails. Let's break it down:
  1. USB VBUS Input and Overcurrent Protection:
    • The USB power input is labeled VBUS. This supply is likely to be a standard 5V supply from a USB port.
    • R21 and R22 are both 10KΩ10K\Omega resistors creating a voltage divider network for the VBUS_VALID signal. This signal could be used by a microcontroller or another part of the circuit to detect the presence of VBUS.
    • F3 is a 2A resettable fuse (also known as a polyfuse or PPTC). It offers overcurrent protection; if the current exceeds 2A, it will increase in resistance, limiting further current to prevent damage to downstream components.
  2. Power Conditioning and Overvoltage Protection:
    • C21 is a 100μF100\mu F capacitor, likely used for decoupling the VBUS supply to reduce noise and provide a reservoir of current for transient loads.
    • D1 is a full-bridge rectifier, ensuring that the polarity of the voltage applied to VDD 5V BRICK is correct, regardless of how VBUS is plugged in (it is a common practice in circuits where the input polarity might be reversed).
    • D2 is a transient voltage suppressor (TVS) diode providing overvoltage protection. It clamps the voltage to a safe level during voltage spikes, protecting sensitive downstream components.
    • R20 and R19 form another voltage divider network labeled VDD BRICK VALID, which, like VBUS_VALID, may be used for detecting correct input voltage levels before the rest of the circuitry is powered.
  3. Voltage Distribution and Additional Protection:
    • After D1 and D2, the voltage feeds into a schottky diode D3, providing further protection against backfeeding voltage into VDD 5V BRICK. It also has a lower forward voltage drop to preserve the 5V level.
    • There are two fuses, F1 and F2, which appear to distribute power to two separate parts of the circuit (VDD 5V RECEIVER and VDD 5V PERIPH). These fuses provide overcurrent protection for the respective sections of the circuit they supply power to. F1 is a 0.3A0.3A fuse, and F2 is a 1A1A fuse, indicating that different sections have different current requirements or protection levels.
  4. Status Indication:
    • There is an LED D4 with a current-limiting resistor R18 (also 220Ω220\Omega) connected to VDD 5V-IN, which likely serves as a power-status indicator. When voltage is present at VDD 5V-IN, D4 will illuminate.
    • C20 is another 100μF100\mu F capacitor paralleled at VDD 5V-IN, again likely for noise reduction and transient current support on this specific power branch.
This circuit is a common approach to handling inputs from potentially unreliable power sources such as USB, with multiple layers of protection to ensure stable operation under various conditions. It ensures that only the correct voltage polarity is provided to the circuit, protects against overvoltages with the TVS diodes, limits the amount of current with resettable fuses, and provides an indication of power status with an LED.
2y
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