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I want to make a power supply circuit using the HLK-20M05? Is anything missing?
@copilot I want to make a power supply circuit using the HLK-20M05? Is anything missing?
2y
To create a functional power supply circuit using the HLK-20M05, let's examine the components and their connections based on the information provided in your project. The HLK-20M05 is a compact switching power supply module that outputs 5V and can supply up to 20W of power, making it suitable for driving many small to medium-sized electronic devices.
Current Configuration
- HLK-20M05 (PS1): It's already included in your project, with connections to AC mains (
AC(L)andAC(N)) and outputs (+VOand-VO).
To ensure safety and reliability, and based on standard practices for using the HLK-20M05, the following components and connections are recommended if they are not already included:
-
Fusing:
- Include a fuse on the AC input line for overcurrent protection. If
F1isn't assigned this role, it should be. Connect it in series with theAC(L)line of the HLK-20M05.
- Include a fuse on the AC input line for overcurrent protection. If
-
EMI Filtering and Varistor:
- EMI filtering on the AC input is important for reducing electromagnetic interference. This can be accomplished with a combination of capacitors and inductors, but specific components are not listed in your project details.
- A varistor across the AC input lines (
AC(L)andAC(N)) for surge protection is advisable. IfZ1is a metal oxide varistor (MOV), then it's correctly placed for this purpose.
-
Electrolytic Capacitor on Output:
- It appears you have
C6(220uF), which is good for smoothing out ripples on the DC output. Ensure it's connected across the+VOand-VO(GND) outputs of the HLK-20M05.
- It appears you have
-
Rectification and Smoothing (If Needed):
- Since HLK-20M05 provides a DC output, additional rectification isn't required. However, the inclusion of smoothing capacitors, like
C6mentioned before, is necessary.
- Since HLK-20M05 provides a DC output, additional rectification isn't required. However, the inclusion of smoothing capacitors, like
-
Load Connections:
- Ensure that the output (
+VOand-VO) of the HLK-20M05 is correctly connected to your circuit's power input nets. In your schematic,+VOshould be connected to5Vnets and-VOtoGND.
- Ensure that the output (
- Connect F1:P1 to AC mains (Live wire preferably), and F1:P2 to PS1:AC(L).
- Connect AC mains Neutral wire to PS1:AC(N).
- Connect PS1:+VO to 5V power net.
- Place C6 with one leg on PS1:+VO and the other on PS1:-VO for output filtering.
- Ensure PS1:-VO is connected to your project's ground net (
GND).
- Safety Considerations: The HLK-20M05 module should be enclosed in a suitably rated enclosure to prevent accidental contact with AC mains voltages.
- Regulatory Compliance: Your stated compliance requirements are RoHS, FCC, CE. Make sure your overall design, including this power supply section, adheres to the appropriate standards and regulations regarding electromagnetic compatibility (EMC) and safety.
Please review and ensure these components and their connections are appropriately integrated into your schematic. If some components or connections are already in place, consider this as a validation of those parts of your design.
2y
2
What is the TAB pin in the ASM1117 used for?
@copilot What is the TAB pin in the ASM1117 used for?
2y
The TAB (Tab) pin on the AMS1117 device serves as an additional ground (GND) connection. It is electrically connected to the ground pin of the device (Pin 1: GND). Therefore, when designing circuits or PCB layouts with the AMS1117, it's important to connect the TAB to the ground plane or ground net in your design to ensure proper operation and heat dissipation.
2y
Is there anything missing in my power regulator?
2y
To evaluate the completeness of your power regulator setup with the AMS1117-3.3 (U2 in your project), let's review the essential components and connections based on the usual application of an AMS1117-3.3 and the details you've provided:
-
Input Capacitor: A capacitor close to the VIN pin (3) of the AMS1117 can help smooth out any input noise and provide a more stable input voltage. The datasheet of similar LDO regulators recommends a value, typically around 10µF. It seems you have not explicitly mentioned an input capacitor for U2.
-
Output Capacitor: For stability, the AMS1117-3.3 requires an output capacitor. You've provided a capacitor, C1 (10u capacity, connected likely on VOUT), based on general practices and the AMS1117 series requirements, which matches the recommendation to include a capacitor of around 10uF on the output to ensure stability[1].
-
Ground Connections: Ensure that the GND Pin (1) and the TAB (also connected to GND internally) are properly connected to the ground net in your circuit. It appears you've followed this principle, considering the schematic conventions you've outlined.
-
Proper Heat Sinking: The AMS1117 can dissipate heat through the TAB. Make sure there's enough copper area on your PCB acting as a heat sink to manage the heat, especially if you're dropping a significant voltage or drawing considerable current.
-
Decoupling Capacitors on VIN/VOUT for Adjacent ICs: While not part of the AMS1117 directly, ensure that any IC powered by the AMS1117 has its decoupling capacitors close by. This isn't directly related to the AMS1117 but is good practice for stable power supply lines.
Given these points, it seems the critical component potentially missing from your description is the input capacitor on VIN of the AMS1117-3.3 (U2). Including a capacitor close to the input of the AMS1117 is recommended for optimal performance, to act as a buffer, and to smooth the input supply line. Other aspects appear covered based on your description and standard practices.
[1] Page 4
2y
5
AC_GND
U1 IO14 - R22
U1 IO26 - R18
AC_GND
U1 IO27 - R20
AC_GND
AC_GND
AC_L
AC_L
AC_N
AC_N
AC_L
AC_N
5v
5v
AC_N
AC_L
K4
K3
K8
K7
J9
R16
Resistance
1kΩ
R17
Resistance
1kΩ
Q6
Not Recommended for New Designs
R15
Resistance
1kΩ
Q8
Not Recommended for New Designs
J5
J6
R18
Resistance
1kΩ
R14
Resistance
1kΩ
Q7
Not Recommended for New Designs
J10
D7
DC_GND
LED8
D8
LED7
DC_GND
DC_GND
Reviews
A generic fixed inductor suitable for rapid circuit topology development. The footprint automatically adapts based on the selected package, supporting standard SMD sizes (e.g., 0402, 0603, 0805) as well as well-known inductor packages such as SDR1806, PA4320, SRN6028, and SRR1260. Standard inductor values: 1.0 nH, 10 nH, 100 nH, 1.0 µH, 10 µH, 100 µH, 1.0 mH 1.2 nH, 12 nH, 120 nH, 1.2 µH, 12 µH, 120 µH, 1.2 mH 1.5 nH, 15 nH, 150 nH, 1.5 µH, 15 µH, 150 µH, 1.5 mH 1.8 nH, 18 nH, 180 nH, 1.8 µH, 18 µH, 180 µH, 1.8 mH 2.2 nH, 22 nH, 220 nH, 2.2 µH, 22 µH, 220 µH, 2.2 mH 2.7 nH, 27 nH, 270 nH, 2.7 µH, 27 µH, 270 µH, 2.7 mH 3.3 nH, 33 nH, 330 nH, 3.3 µH, 33 µH, 330 µH, 3.3 mH 3.9 nH, 39 nH, 390 nH, 3.9 µH, 39 µH, 390 µH, 3.9 mH 4.7 nH, 47 nH, 470 nH, 4.7 µH, 47 µH, 470 µH, 4.7 mH 5.6 nH, 56 nH, 560 nH, 5.6 µH, 56 µH, 560 µH, 5.6 mH 6.8 nH, 68 nH, 680 nH, 6.8 µH, 68 µH, 680 µH, 6.8 mH 8.2 nH, 82 nH, 820 nH, 8.2 µH, 82 µH, 820 µH, 8.2 mH #generics #CommonPartsLibraryjharwinbarrozo16.5k- A generic fixed capacitor ideal for rapid circuit topology development. You can choose between polarized and non-polarized types, its symbol and the footprint will automatically adapt based on your selection. Supported options include standard SMD sizes for ceramic capacitors (e.g., 0402, 0603, 0805), SMD sizes for aluminum electrolytic capacitors, and through-hole footprints for polarized capacitors. Save precious design time by seamlessly add more information to this part (value, footprint, etc.) as it becomes available. Standard capacitor values: 1.0pF, 10pF, 100pF, 1000pF, 0.01uF, 0.1uF, 1.0uF, 10uF, 100uF, 1000uF, 10000uF 1.1pF, 11pF, 110pF, 1100pF 1.2pF, 12pF, 120pF, 1200pF 1.3pF, 13pF, 130pF, 1300pF 1.5pF, 15pF, 150pF, 1500pF, 0.015uF, 0.15uF, 1.5uF, 15uF, 150uF, 1500uF 1.6pF, 16pF, 160pF, 1600pF 1.8pF, 18pF, 180pF, 1800pF 2.0pF, 20pF, 200pF, 2000pF 2.2pF, 22pF, 220pF, 2200pF, 0.022uF, 0.22uF, 2.2uF, 22uF, 220uF, 2200uF 2.4pF, 24pF, 240pF, 2400pF 2.7pF, 27pF, 270pF, 2700pF 3.0pF, 30pF, 300pF, 3000pF 3.3pF, 33pF, 330pF, 3300pF, 0.033uF, 0.33uF, 3.3uF, 33uF, 330uF, 3300uF 3.6pF, 36pF, 360pF, 3600pF 3.9pF, 39pF, 390pF, 3900pF 4.3pF, 43pF, 430pF, 4300pF 4.7pF, 47pF, 470pF, 4700pF, 0.047uF, 0.47uF, 4.7uF, 47uF, 470uF, 4700uF 5.1pF, 51pF, 510pF, 5100pF 5.6pF, 56pF, 560pF, 5600pF 6.2pF, 62pF, 620pF, 6200pF 6.8pF, 68pF, 680pF, 6800pF, 0.068uF, 0.68uF, 6.8uF, 68uF, 680uF, 6800uF 7.5pF, 75pF, 750pF, 7500pF 8.2pF, 82pF, 820pF, 8200pF 9.1pF, 91pF, 910pF, 9100pF #generics #CommonPartsLibraryjharwinbarrozo1.5M
- A generic fixed resistor ideal for rapid circuit topology development. Its footprint automatically adapts based on the selected package case code—supporting 0402, 0603, 0805, 1203, and many other standard SMD packages, as well as axial horizontal and vertical configurations. Save precious design time by seamlessly add more information to this part (value, footprint, etc.) as it becomes available. Standard resistor values: 1.0 ohm, 10 ohm, 100 ohm, 1.0k ohm, 10k ohm, 100k ohm, 1.0M ohm 1.1 ohm, 11 ohm, 110 ohm, 1.1k ohm, 11k ohm, 110k ohm, 1.1M ohm 1.2 ohm, 12 ohm, 120 ohm, 1.2k ohm, 12k ohm, 120k ohm, 1.2M ohm 1.3 ohm, 13 ohm, 130 ohm, 1.3k ohm, 13k ohm, 130k ohm, 1.3M ohm 1.5 ohm, 15 ohm, 150 ohm, 1.5k ohm, 15k ohm, 150k ohm, 1.5M ohm 1.6 ohm, 16 ohm, 160 ohm, 1.6k ohm, 16k ohm, 160k ohm, 1.6M ohm 1.8 ohm, 18 ohm, 180 ohm, 1.8K ohm, 18k ohm, 180k ohm, 1.8M ohm 2.0 ohm, 20 ohm, 200 ohm, 2.0k ohm, 20k ohm, 200k ohm, 2.0M ohm 2.2 ohm, 22 ohm, 220 ohm, 2.2k ohm, 22k ohm, 220k ohm, 2.2M ohm 2.4 ohm, 24 ohm, 240 ohm, 2.4k ohm, 24k ohm, 240k ohm, 2.4M ohm 2.7 ohm, 27 ohm, 270 ohm, 2.7k ohm, 27k ohm, 270k ohm, 2.7M ohm 3.0 ohm, 30 ohm, 300 ohm, 3.0K ohm, 30K ohm, 300K ohm, 3.0M ohm 3.3 ohm, 33 ohm, 330 ohm, 3.3k ohm, 33k ohm, 330k ohm, 3.3M ohm 3.6 ohm, 36 ohm, 360 ohm, 3.6k ohm, 36k ohm, 360k ohm, 3.6M ohm 3.9 ohm, 39 ohm, 390 ohm, 3.9k ohm, 39k ohm, 390k ohm, 3.9M ohm 4.3 ohm, 43 ohm, 430 ohm, 4.3k ohm, 43K ohm, 430K ohm, 4.3M ohm 4.7 ohm, 47 ohm, 470 ohm, 4.7k ohm, 47k ohm, 470k ohm, 4.7M ohm 5.1 ohm, 51 ohm, 510 ohm, 5.1k ohm, 51k ohm, 510k ohm, 5.1M ohm 5.6 ohm, 56 ohm, 560 ohm, 5.6k ohm, 56k ohm, 560k ohm, 5.6M ohm 6.2 ohm, 62 ohm, 620 ohm, 6.2k ohm, 62K ohm, 620K ohm, 6.2M ohm 6.8 ohm, 68 ohm, 680 ohm, 6.8k ohm, 68k ohm, 680k ohm, 6.8M ohm 7.5 ohm, 75 ohm, 750 ohm, 7.5k ohm, 75k ohm, 750k ohm, 7.5M ohm 8.2 ohm, 82 ohm, 820 ohm, 8.2k ohm, 82k ohm, 820k ohm, 8.2M ohm 9.1 ohm, 91 ohm, 910 ohm, 9.1k ohm, 91k ohm, 910k ohm, 9.1M ohm #generics #CommonPartsLibraryjharwinbarrozo1.5M
- An electrical connector acting as reusable interface to a conductor and creating a point where external circuits can be connected.Terminal
- Wirelessly connects nets on schematic. Used to organize schematics and separate functional blocks. To wirelessly connect net portals, give them same designator. #portaljharwinbarrozo43.0M
- General Purpose Thick Film Standard Power and High-Power Chip Resistor 47 kOhms ±5% 0.125W, 1/8W Chip Resistor 0805 (2012 Metric) Automotive AEC-Q200 Thick Film Features: - RMCF – standard power ratings - RMCP – high power ratings - Nickel barrier terminations standard - Power derating from 100% at 70ºC to zero at +155ºC - RoHS compliant, REACH compliant, and halogen free - AEC-Q200 compliantjharwinbarrozo1.2M
- 10 µF 16 V Aluminum - Polymer Capacitors Radial, Can - SMD 30mOhm 2000 Hrs @ 105°C #commonpartslibrary #capacitor #aluminumpolymer #radialcanjharwinbarrozo1.2M
- Battery Holder (Open) Coin, 20.0mm 1 Cell SMD (SMT) Tab bate or batt #forLedBlinkjharwinbarrozo700.5k
powerWizard
Matter-enabled 8-channel Power Strip with built-in temperature and humidity sensor. #iot #esp32 #smarthome #matter
Properties
ESP-IDF
WiFi
MQTT
5V
10 to 90%
%
RoHS, FCC, CE
-10 to 70
°C
PCB Trace
Touchscreen, Buttons
20,000
hrs
10
yrs
Small gadget
1
4
Consumer Electronics
Pricing & Availability
Distributor | Qty 1 |
|---|---|
Digi-Key | $0.73–$2.98 |
LCSC | $13.30–$14.01 |
Mouser | $3.12 |
Controls
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cosmoskiller
copilot
- Safety: The most important reason to keep the AC mains ground separate from the low voltage (LV) ground is safety. Mixing the two can pose significant risks, including electric shock or inadvertently introducing high voltage into low-voltage parts of the circuit, potentially causing damage or even fires.
- Noise and Interference: High-voltage AC lines can introduce noise into the low voltage DC circuits, especially if the grounds are shared. This can lead to erratic behavior or malfunction of sensitive electronics.
- Regulatory Compliance: Certain standards and regulations may necessitate the separation of grounds for AC mains and low-voltage circuits. Compliance ensures that the design can be legally and safely deployed in its intended environment.
Recommendations-
Separate Ground Nets: Design your circuit with distinct ground nets for the 220V AC and low voltage components. In schematic representation and PCB layout, these should be clearly identified as such, for example,
-
Ground Connection: While the AC and DC grounds should be kept separate on the board, they should ideally connect at a single point, typically at the power supply. This practice, known as "single-point grounding," minimizes the risk of ground loops which can introduce interference.
-
Isolated Power Supply: If your design powers the low voltage circuitry from the 220V AC, use an isolated power supply. This ensures that the two grounds are physically separated and prevents high voltage from reaching the low voltage parts of your circuit.
-
Physical Separation: When laying out your PCB, ensure there's a clear physical separation between the high voltage and low voltage sections. Place components and route traces in a way that minimizes any risk of arcing or interference. Using slots or moats in the PCB around high voltage traces can enhance safety.
Additional Safety FeaturesAC_GNDandDC_GND.