12 A Adjustable Step Down DC-DC Module

Overview

This product is a step-down voltage source, high power (maximum 300 W provided with additional dissipation). This module can be used to obtain voltages of 0.8 V to 28 V, 7 V from 32 V, with a maximum current of 12 A, providing a suitable cooling.

This is small in size with a very good efficiency, up to 95%, and very little heat dissipation, as compared with the power control. With this circuit, you can build your own source laboratory with adjustable voltage and current or you can include it in your projects. Moreover, you can control LED power or recharge batteries safely.

Specifications

• Input Voltage: 7 V to 32 V
• The input voltage must be greater than the minimum 1 V output
• Output Current: 0.2 A to 12 A (for maximum current must improve heat dissipation)
• Maximum Output Power: 300 W
• Efficiency: up to 95%
• Operating Frequency: 300 kHz
• Ripple: 50 mV (measured at 24 V –>  12 V, 5 A)
• Leakage Current: 20 mA (at 24 V ->12 V)
• Adjustable output voltage and current
• Dimensions: 65 x 47 x 23.5 mm

Applications

Adjustable power supply (12A power enough), high-power LED drive, LED display drive, lead-acid battery charging, lithium battery charging, car power supply, car laptop power supply (buck), regulated power supply, low-voltage system power supply, (such as children The toy car uses 12V battery to step down to 6V), 24V to 12V 12A 12V to 5V 12A 24V to 5V 12A 24V to 19V20V, etc., the application range is very wide.

1. The fixed lamp current is 0.1 times the constant current value (used to identify whether the battery is full when charging);

2. A dedicated reference IC and high-precision sampling resistor are used to make the constant current more stable (the temperature drift is less than 5% when the constant current is 5A from 20 degrees to 60 degrees). Especially suitable for LED driver

3. The output current is large, the output current can reach 12A, which meets most needs.

4.4 high-frequency capacitors, effectively reducing output ripple and improving working stability

5. Double heat sink design, independent heat sink for MOS tube Schottky diode, good heat dissipation, no mutual influence

6. Use large-size sendust magnetic ring at any cost to improve work efficiency, and use pure copper double wires to reduce heat generation and increase rate.

7. 3296 multi-turn potentiometer, high precision of voltage and current adjustment, good stability.

8. The special current sampling resistor has high current sampling accuracy, good stability, and low temperature drift. LED .

9. Two-color indicator light, the working status is clear at a glance. Recharge.

10. The voltage and current are all adjustable, and the effect of making an adjustable power supply is good. The 12A current is large and the power is sufficient.

Battery Charging Method

1. Determine the float voltage and charging current of the rechargeable battery you need, and the input voltage of the module;

2. Adjust the constant voltage potentiometer to adjust the output voltage to about 5V.

3. Measure the output short-circuit current with a multimeter 10A current block, and adjust the constant current potentiometer to make the output current reach the predetermined charging current value;

4. Adjust the constant voltage potentiometer to make the output voltage reach the float voltage;

5. Connect the battery and try charging.

(Steps 1, 2, 3, and 4 are for the input of the module to be connected to the power supply, and no-load output to the battery.)

How to Use LED Constant Current Drive

1. Determine the working current and working voltage you need to drive the LED;

2. Adjust the constant voltage potentiometer to adjust the output voltage to about 5V.

3. Measure the output short-circuit current with the 10A current block of a multimeter, and adjust the constant current potentiometer to make the output current reach the predetermined LED working current;

4. Adjust the constant voltage potentiometer to make the output voltage reach the LED working voltage;

5. Connect the LED and test the machine.

(Steps 1, 2, 3, and 4 are to connect the module input to the power supply, and the output is no-load without LED lights.)

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