4A buck-boost module (constant voltage constant current liquid crystal display version)

1.1. LCD can display input and output voltage, output current output power;

1.2. Input end anti-reverse protection, reverse connection will not burn;

1.3. It can be boosted, can be stepped down, the output voltage can be adjusted freely from 0.5-30V, and the current limit of 0-4A can be adjusted freely;

1.4. The output end is anti-backflow, and there is no need to add an anti-backflow diode when charging the battery;

1.5. Press the button to control the output ON/OFF state, and you can set the power-on default to ON or OFF;

1.6. Using the buck-boost chip as the main controller, external 60V 75A MOS tube as the switch tube, dual 60V 5A SS56 Schottky for rectification, 60V withstand voltage value, better than the market XL6009/LM2577 immature solution (many The device withstand voltage is insufficient, the MOS tube and Schottky diode withstand voltage must be greater than the input plus input voltage value);

1.7. The output ripple is small and there is LC filtering;

1.8. Contains a heat sink, and the module supports the isolation column.

Input voltage: 5.5-30V (when the input voltage is 5V, the buck-boost can also be realized, but the voltage and current measurement is not accurate; below 4.7V, undervoltage protection)

Output voltage: 0.5-30V

Output current: can work stably at 3A for a long time, and can reach 4A under enhanced heat dissipation

Output power: natural heat dissipation 35W, enhanced heat dissipation 50W

Voltage display resolution: 0.05V

Current display resolution: 0.005A

Conversion efficiency: about 88%

Soft start: Yes (large power with load module may fail when starting)

Input reverse connection protection: Yes

Output end anti-backflow: Yes

Short circuit protection: Yes

Working frequency: 180KHZ

Size: length * width * height 66 * 48 * 21mm

Mounting hole: diameter 4mm

Weight: 46g

3.1. The module has IN/OUT, ON/OFF two buttons: IN/OUT button switches input voltage and output voltage display, long press can switch output current output power display; ON/OFF button control output is ON or OFF, long press can Set the default output status of the next power-on to be ON or OFF.

3.2. CC sets the potentiometer for current. It rotates clockwise to increase the set current. When the load current reaches the set current, it enters the constant current state. The CC constant current indicator (red) lights up; the right CV is the voltage setting. The potentiometer rotates clockwise to increase the output voltage. The ON indicator is an output status indicator that lights up when there is voltage at the output, otherwise it is off.

4.1. Use as a normal buck-boost module with overcurrent protection

(1) Adjust the CV constant voltage device so that the output voltage reaches the voltage you want.

(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 CC constant current potentiometer to make the output current reach the predetermined overcurrent protection value. (For example, if the current value displayed by the multimeter is 2A, then the maximum current can only be 2A when you use the module, and the red constant voltage constant current indicator will be on when the current reaches 2A, otherwise the indicator will be off)

Note: When using in this state, there is a current sampling resistor at the output, there will be a voltage drop of 0~0.2V after the load is connected, and at the same time, the input wire and the output wire will have a certain line voltage drop when the current is large. This is normal!

4.2. 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, automatically switch back to constant voltage charging when charging to a certain extent.

(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, and the maximum charge current is 1C, which is 2200mA)

(2) Under no-load conditions, the multimeter measures the output voltage, and adjusts the constant voltage positioner 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 constant current potentiometer to make the output current reach the predetermined charging current value;

(4) Connect the battery and charge it.

(Steps 1, 2, and 3 are: input terminal is connected to the power supply, and the output terminal is not connected to the battery at no load)

4.3. Use as a high power LED constant current drive module

(1) Determine the operating current and maximum operating voltage at which you need to drive the LEDs;

(2) Under no-load conditions, the multimeter measures the output voltage, and adjusts the constant voltage position device to make the output voltage reach the maximum working voltage of the LED;

(3) Measure the output short-circuit current with the multimeter 10A current file, and adjust the constant current potentiometer to make the output current reach the predetermined LED operating current;

(4) Connect the LED and test the machine.

(Steps 1, 2, and 3 are: input is connected to the power supply, and the output is not connected to the LED light.)

Note: When using this module for more than 3A, 35W, please strengthen the heat! ! !

5.1. Module input IN-disable and output OUT-short, otherwise the constant current function will be invalid.

5.2. Please ensure that the power of the power supply is always greater than the power required by the output load!

5.3. If the module wants full load output, the input voltage should be more than 8V. When the input voltage is 5V, the output power is about 15W, and the voltage ammeter fails. The module current value is up to 4A, subject to the maximum output power, such as output 17V, the current should be no more than 2A.

5.4. Module with output short circuit protection, the module automatically closes the output after short circuit protection, and can be restored when the module is powered on again. If your power supply has no output current limiting protection, it is recommended to connect the fuses in series with the front end of the module to improve the safety factor.

5.5. The module has input undervoltage protection function. The default is about 4.7V. After this value is exceeded, the output will be automatically disconnected and the module can be restored after power-on (note that the voltage at the module port is larger when the input current is larger. Do not ignore the partial pressure on the input lead).

6. Service statement

6.1 All products are guaranteed for one year, seven days without reason to return; within 30 days of product quality problems (except for damage caused by improper damage or improper use), we return and bear the freight; for more than 30 days, the buyer bears the return shipping, we are free Repairs, customer-induced damages are charged for repairs.

6.2. If the responsibilities are not clear, we will make compensation after finding out the problem. The module is overloaded, short-circuited, etc., and the bomber, chip burned, etc. caused by improper use are not compensated.

6.3. Electronic module products, you need to have a certain electronic foundation, carefully read the product description before use; products are not designed for medical, life-saving, life-sustaining, etc., can not be used in dangerous places such as coal mines, etc. None of the products are guaranteed; the profit of the products is low, and the user's operating ability and use occasions are very different. If the products of this store are compatible with your own valuable equipment or digital products, we will not guarantee any damage, we only have the ability to pay the module and freight. .