Features:
1. Made of high quality materials, durable and practical
2. Exquisite appearance, beautiful arrangement of components
3. Module ultra-small size, limited heat dissipation area, high-power output heat is a normal phenomenon, we choose the high quality materials, do not have to worry about heat affecting the life of the module.
4. The product supports 1-4S lithium-ion battery charging, you can use the resistor to adjust the charging current (input side and battery side)
5. The module has multiple protection, output over-current, over-voltage, short circuit protection and so on.

Product Description: This module charges 1S to 4S lithium-ion battery module, short-circuit settings. Current maximum support 3A, charging power, then according to the battery voltage to calculate, such as the current voltage of the battery when 13V, multiplied by 3A is 39W, this power is relatively large, the power supply power is not large enough, we can set the input current to set the setting of the maximum power of charging to ensure that the compatibility of the entire charging system, note that the module is a step-down type, the input voltage should be higher than the value of the voltage of your fully charged battery. That is to say, generally should be greater than 4.2V multiplied by the voltage of the number of set battery series.

Parameter:
Input: working input voltage range 5V to 26V, note that the module is buck type, the input voltage should be higher than the voltage value of your battery fully charged. That is, the input voltage should be greater than 4.2V multiplied by the voltage of the set number of battery strings. To ensure the compatibility of the power supply, you can refer to the instruction picture to set the upper limit of input current. Board default posted a 75K and a 50K (INN), respectively, corresponding to 1A and 1.5A current total of 2.5A. Other input current value can be set by their own change resistance, the formula is: resistance R = 75K / input current A.

Output: support 1S to 4S, the battery needs to add a protection board, the number of series directly shorted setting, specific reference to the instruction picture setting. Default charging current set up two parallel 50K resistors, each corresponding to 1.5A current, a total of 3A after removing one of the 1.5A, other current values can be set to change their own resistors, the formula is: resistor R = 75K / battery current A, can not be over 3A.

The actual charging current takes the smaller value of the set battery side charging current and the input side charging current. Charging power is equal to the real-time battery voltage multiplied by the current. Higher power, make sure the wiring is welded, the wire is thick enough, and the power supply power is enough.

NTC access: normal not in use, if necessary, the NTC resistor resistance value to 82K (the lower left corner of the word “SCL” resistance), NTC welding point and the next GND access 100K thermistor (B = 4100).

LED indicator: light flashes when charging, full often light.

Module interface:
VIN +: power supply positive, the input voltage must be greater than the maximum voltage of the fully charged
GND: power supply negative BAT+: connected to the positive end of the series battery (protection board is generally identified as P +)
BAT-: connected to the negative terminal of the series battery (the protection board is generally identified as P-)
SCL SDA: MCU communication port, normally not used.
NTC GND: temperature sensing interface, normally not used

Package include:
Li-ion battery charging module * 1