Model A: 1. Input voltage: DC5V-32V; 2. Output voltage: adjustable from DC0.8-30V; 3. Conversion efficiency: up to 95%; 4. Output current: maximum output current 5A, adjustable; 5. Output power: up to 75W; 6. Size:51mm*26.3mm*14mm Model B: 1. Input voltage: DC4V-38V; 2. Output voltage: adjustable from DC1.25-36V; 3. Conversion efficiency: up to 96%; 4. Output current: maximum output current 5A, adjustable; 5. Output power: up to 75W; 6. Size:61.7mm*6.2mm*15mm Functional characteristics 1. Can be used as a normal buck module with overcurrent protection capability; 2. Can be used as battery and battery charger; 3. Can be used as a high power LED constant current drive module; 4. There are two modes of constant current and constant voltage, and there are indicators to indicate which mode is currently in; 5. When used as a lithium battery charger, you can set the float voltage and charge current, and the indicator light indicates whether it is charging or is full; 6. With current limiting protection, the module will not burn out even if the output is short circuited. Application range 1. Use as a normal buck module with overcurrent protection Instructions: (1) After power-on, adjust the voltage potentiometer to make the output voltage reach the ideal voltage; (2) Use the multimeter 10A current file to measure the output short-circuit current (directly connect the two test leads to the output terminal), and adjust the current potentiometer to make the output current reach the predetermined overcurrent protection value. (For example, if the current value displayed by the multimeter is 4A, then the high current can only reach 4A when you use the module, and the red constant current indicator will be on when the current reaches 4A, otherwise the indicator will be off) Note: When using in this state, since the output has a current sampling resistor of 0.05 ohms, there will be a voltage drop of 0~0.3V after the load is connected. This is normal! This voltage drop is not pulled down by your load, but falls to the sampling resistor. 2. Use as a battery charger Modules without constant current function cannot be used to charge the battery. Because the voltage difference between the battery and the charger that consumes electricity is too large, the charging current is too large, causing damage to the battery. Therefore, the battery should be used at the beginning. Stream charging, when the charging reaches a certain level, it automatically switches back to constant voltage charging. Instructions: (1) Determine the float voltage and charge current of the rechargeable battery you need; (if the lithium battery parameter is 3.7V/2200mAh, then the float voltage is 4.2V, the maximum charge current is 1C, ie 2200mA); (2) Under no-load conditions, the multimeter measures the output voltage, and adjusts the voltage potentiometer to make the output voltage reach the float voltage; (if charging the 3.7V lithium battery, adjust the output voltage to 4.2V); (3) Use the multimeter 10A current file to measure the output short-circuit current (directly connect the two test leads to the output terminal), and adjust the current potentiometer to make the output current reach the predetermined charging current value; (4) The charging lamp current defaults to 0.1 times the charging current; (the batter