1.Description:
It is a step-down module.This module is a DC-to-DC step-down module,and the input voltage must be higher than the output voltage by 2V.
2.Feature:
1).It is convenient to adjust,and the voltage and current are adjusted by a long-handled knob,no need to use tools to adjust.
2).High precision can be calibrated,input and output voltage and output current can be calibrated by oneself,voltage accuracy reaches 0.01V,current accuracy is 0.001A.
3).It is equipped with various protections,anti-reverse connection-reverse connection does not burn,anti-overflow-directly connect to the battery,do not worry about the battery backflow and burn the module,do not need to connect a diode,overcurrent protection-output short connection does not burn,recharge the battery Current limit safety.
4).With DC5.5 input port,with USB adjustable voltage output interface.
5).Five kinds of parameter display including capacity,input and output voltage display,output current display,power display,capacity display.
6).The output ripple is extremely small,and the output is with LC filter.
3.Parameter:
1).Product Name:Step-Down Module
2).Input Voltage:DC 5V-27V
3).Output Voltage:DC 1V-24V
4).Output Current:3A(Max)
5).Output Power:30W(Max)
6).Voltage Display Resolution:0.01V
7).Current Display Resolution:0.001A
8).Capacity Range:99.99Ah
9).Capacity Display Resolution:0.001Ah
10).Conversion Efficiency:95%(Max)
11).Working Current:30mA
12).Work Temperature:-25℃~85℃
13).Work Humidity:5%~95%RH
14).Size:67*53*30mm
4.Function Description:
1).Button:
1.1)."+" Button:Long press-enter or exit the precision calibration interface;short press-the current correction value needs to be increased by one unit.
1.2)."-" Button:Long press-clear the capacity count value;short press-the current correction value needs to be reduced by one unit.
1.3)."SELECT" Button:Long press-switch between current,power and capacity display;short press-switch between input voltage and output voltage display.
1.4)."ON/OFF" Button:long press-set the default output when power-on is off or on;short press-control the on or off of the output.
2).Potentiometer Knob.
1.1).On the left is the current adjustment potentiometer CC,which can be rotated clockwise to increase the set current.When the load current reaches the set current,it enters the constant current state (note that the output current can not be increased by adjusting the potentiometer.Under constant voltage) ,The output current only depends on the load,it changes according to the load).
1.2).On the right is the voltage adjustment potentiometer CV,which can be rotated clockwise to increase the output voltage (this model is a step-down module,and the input voltage needs to be 2V higher than the output voltage.If the output voltage cannot be adjusted,you should first adjust the CV potentiometer counterclockwise to the end ).
3).Indicator:
1.1).CC:Constant current indicator,it lights up (red) at constant current.
1.2).Full:battery full indicator (green),if the set constant current value is 2A,the light will turn when the charging current reaches below 0.2A,the Full indicator will be on,and the Charge indicator will be off.
1.3).Charge:battery charging indicator (blue).
1.4).ON:output status indicator (green).
4).Input and Output Ports:
1.1).Input terminal:On the left,DC5.5mm socket or 5.08mm terminal as input.
1.2).Output terminal:On the right side,the USB port or 5.08mm terminal is used as output,and it can also be output at the same time (the voltage of the USB port is not absolute 5V,it is directly connected to the terminal,and the adjustable range is 1-24V).
5.Accuracy Calibration Method:
1).Input voltage calibration:Long press the "+" button to enter the SET interface,the current display is the input IN voltage,short press the "+" or "-" button to adjust,and long press the "+" button to exit the SET interface.
2).Output voltage calibration:long press the "+" button to enter the SET interface,the current display is the input IN voltage,press the "SELECT" button to switch to display the OUT voltage,short press the "+" or "-" button to adjust,then long press "+" button to exit the SET interface.
3).Output current calibration:Long press the "+" button to enter the SET interface,the current display is the input IN voltage,press the "SELECT" button to switch to display OUT voltage,and then press the "SELECT" button to switch to the display output current interface.Short press the "+" or "-" button to adjust,and long press the "+" button to exit the SET interface.
4).Note: The calibration is more accurate when the current is greater than 1A;the display error is large when the output current is less than 0.05A,and it may not be displayed when the output current is less than 10-40mA.
6.Note:
1).It is not allowed to input the AC power directly reduced by the transformer.
2).The input voltage must not be used excessively.In order to increase the safety factor,it is recommended to connect a 3A fuse in series to the input end of the power module.
3).The input voltage needs to be higher than the output voltage 2V.If the output voltage cannot be adjusted,it may be because the position of the potentiometer is higher than the input voltage.You can adjust the CV potentiometer counterclockwise twenty times to see the output voltage change.
4).Module input IN- must not be short-circuited with output OUT-,otherwise the constant current function will fail.
5).Please make sure that the power of the power supply is always greater than the power required by the output load.When the module is hot, please reduce the power.
7.Package:
1).1pcs Step-Down Module
2).4pcs Acrylic Board
3).8pcs Screw
4).8pcs Copper Pillar
5).1pcs Heat Sink
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