How do I choose a lighting product module power supply mode?

1. AC-DC constant voltage output power supply:

A module's normal working voltage range is 3.0 V to 3.6 V.

If the output voltage is higher than 3.3 V, consider the output voltage ripple and output power in addition to the power to the module to prevent insufficient power supply to the module due to undervoltage output. The power supply system must ensure a stable power supply voltage under the maximum output power.

If the output voltage is the module's power supply voltage or 3.3 V, set the output voltage midpoint value to 3.3 V to have a ripple voltage of less than 100 mV and an average Wi-Fi module current of about 80 mA. The AC-DC power supply system must generate 200 mA current on average. The peak value of the dynamic output current of the power supply system must reach 450 mA, and the voltage drop cannot exceed 2.8 V. The 3.3 V Wi-Fi module's power supply pin is connected to a 0.1 μF ceramic capacitor to reduce interference. To power a 3.3 V Bluetooth or Zigbee module, the DC-DC power supply system must have a ripple voltage of less than 100 mV and be able to generate 50 mA current on average. When the dynamic output current is 100 mA, the output voltage drop will not exceed 2.8 V.

In low standby power application scenarios, select the low standby power AC-DC drive chip and a module with a low standby current.

Use a diode and capacitor to isolate the AC-DC power supply circuit from the main power to prevent the working module from affecting the main power, especially the linear constant-current drive power source, so that flickering light will not occur.

2. DC-DC constant-voltage output power supply:

When a module embedded with a DC-DC voltage reduction circuit is powered by DC voltage, the DC voltage cannot exceed 40 V.

When the DC voltage exceeds 3.3 V, use a voltage reduction chip to reduce the voltage to 3.3 V. A switch-type voltage reduction control chip is recommended. To power a 3.3 V Wi-Fi module, the DC-DC power supply system must have a ripple voltage of less than 100 mV and be able to generate 200 mA current. When the dynamic output current is 450 mA, the output voltage drop does not exceed 2.8 V. The 3.3 V Wi-Fi module's power supply pin is connected to a 0.1 μF ceramic capacitor to reduce interference. To power a 3.3 V Bluetooth or Zigbee module, the DC-DC power supply system must have a ripple voltage of less than 100 mV and be able to generate 50 mA current on average. When the dynamic output current is 100 mA, the output voltage drop will not exceed 2.8 V.