4A DC-DC Adjustable Voltage Regulator Boost Buck Step Up Down Converter 5V 12V in Pakistan:

Description:
1. Can be boosted, but also buck, the output voltage 0.5-30V arbitrary adjustment, limiting current 0-4A arbitrary adjustment; can be used for LED constant current drive, battery charging and other constant current occasions, while limiting current with overcurrent protection, more secure ; Constant current mode indicator, charging indicator, full of light. Output anti-backwash, do not charge the battery when the additional anti-flooding diode.
2. XL6009 / LM2577 on the market using a single SS34 rectifier, the first pressure value is not enough, according to the principle of starting and lowering the rectifier and switch tube voltage value is greater than the maximum input voltage plus the maximum output voltage (if the input voltage and output voltage are the largest For the 30V, mos tube and Schottky’s voltage at least to reach 60V), SS34 pressure up to 40V, 6009 maximum pressure 36V, this module design is the existence of security risks;
3. The current output capacity is not enough, the original SS34 maximum current 3A (coupled with switching losses, poor heat, the real current capacity can be less than 3A), Schottky once the voltage is too high or the temperature is too high will be broken, Whole module. There are security risks;
4. Finally, XL6009 / LM2577 program is low efficiency, ordinary inductive heat, not the buck chip, the lack of adequate protection.
5. The module uses the step-up and down the chip as the main controller, external 60V 75A MOS tube as a switch, double 60V 5A SS56 Schottky do rectifier.

Introduction:
1. Wide voltage input 5.5-30V, wide voltage output 0.5-30V, both boost can also buck, such as you adjust the output voltage of 18V, then the input voltage between 5.5-30V casually change, will be constant output 18V; then For example, you enter 12V, adjust the potentiometer settings 0.5-30V arbitrary output.
2. High power, high efficiency, better performance than XL6009 / LM2577 program. Using external 60V75A high power MOS, parallel high current high withstand voltage Schottky diode SS56. Not 6009 or 2577 program SS34 can be compared, because according to the principle of step-up and down, MOS and Schottky’s pressure is greater than the sum of the input and output voltage. Iron silico aluminum magnetic ring inductance, high efficiency.
3. Constant current mode without electric whistle.
4. You can set the current size, used to limit the output current, constant current drive, battery charging lamp occasions.
5. Comes with the output anti-backwash function, to the battery charge without additional anti-flooding diode.

Parameter:
1>. Input voltage: 5-30V
2>. Output voltage: 0.5-30V
3>. Output current: to long-term stability in the 3A, to strengthen the heat can reach 4A
4>. Output power: natural cooling 35W, strengthen the heat 60W
5>. Conversion efficiency: 88% or so
6>. Short circuit protection: Yes
7>. Operating frequency: 180KHZ
8>. Size: 65 * 32 * 21mm
9>. Work temperature:-20~85Celsius

Use method:
1>. Used as a general step-up and step-down module with overcurrent protection capability
Instructions:
(1). Adjust the CV constant voltage potentiometer so that the output voltage reaches the value you want.
(2). with the multimeter 10A current measurement output short-circuit current (directly to the two test leads can be connected to the output), while adjusting the CC constant current potentiometer so that the output current to achieve a predetermined over-current protection value. (Such as multimeter shows the current value is 2A, then you use the module when the maximum current can only be 2A, the current to 2A when the red constant voltage constant current indicator light, otherwise the indicator light off)
Note: When used in this state, because the output has 0.05 ohm current sampling resistor, connected to the load will be 0 ~ 0.3V voltage drop, this is a normal phenomenon! This voltage drop is not pulled down by your load, but is reduced to the sampling resistor.

2>. Used as a battery charger
Non-constant current function of the module can not be used to charge the battery, due to the power consumption of the battery and the charger is very large, resulting in charging current is too large, resulting in battery damage, so the beginning of the battery to use constant Flow charge, when the charge to a certain extent, when the automatic switching back to constant voltage charging.
Instructions:
(1). to determine the rechargeable battery you need to recharge the battery voltage and charge current, if the lithium battery parameters of 3.7V / 2200mAh, then the float voltage of 4.2V, the maximum charge current of 1C, or 2200mA.
(2). no-load conditions, the multimeter to measure the output voltage, adjust the constant voltage potentiometer so that the output voltage to float voltage; (if the 3.7V lithium battery charge, the output voltage can be adjusted to 4.2V)
(3). with a multimeter 10A current measurement output short-circuit current (directly to the two test leads can be connected to the output), while adjusting the constant current potentiometer so that the output current reaches a predetermined charge current value;
(4). Charging Turn the lamp current factory default 0.1 times the charging current. (The battery in the process of charging the current is gradually reduced, and gradually from constant current charging to constant voltage charging, if the charge current is set to 1A, then when the charge current is less than 0.1A, the blue light off, green light Since the battery charge is completed)
(5). connected to the battery, charging.
(Steps 1, 2, 3, 4 are: input termination power supply, the output does not load the battery)

3>. Used as a high power LED constant current drive module
(1). determine the operating current and maximum operating voltage you need to drive the LED;
(2). under no-load conditions, multimeter to measure the output voltage, adjust the constant voltage potentiometer to the output voltage to LED maximum operating voltage;
(3). measuring the output short-circuit current with the multimeter 10A current level while adjusting the constant current potentiometer so that the output current reaches the predetermined LED operating current;
(4). connected to the LED, test machine.
(Step 1, 2, 3: input power supply, the output no load LED lights.)
Note: This module in more than 3A, 35W use, please strengthen the heat!

Precautions:
1>. The module input IN- is disabled from the output OUT-, otherwise the constant current function is disabled.
2>. Make sure that the power time of the power supply is greater than the power required for the output load!
3>. Module input No input anti-reverse function, please pay attention to the direction of power supply positive and negative.
4>. Input voltage to 8V or more, the module can the maximum power output, when the input voltage is 5V, the output power of about 15W. Module current value of the maximum 4A, the premise is limited by the maximum output power, such as the output 17V, the current should not be greater than 2A.
5>. Module with output short circuit protection, short circuit protection module automatically shut down the output, to re-power the module can be restored, if your power supply without output current limit protection, it is recommended in the module input front-end fuse, improve safety factor.
6>. The module has input undervoltage protection function, the default is about 4.2V, below this value, it will automatically disconnect the output, to re-power the module can be restored (note that the module port voltage, when the input current is relatively large , Do not ignore the input voltage on the wire).
7>. The module contains three indicators, constant voltage constant current status indication (red, constant current mode light), charge indication (blue), full of instructions (green, turn the lamp current is 0.1 times the set current).

Application:
1>. Car Power
2>. Industrial power supply
3>. Model power supply
4>. Embedded systems and so on

5>. Laboratory