ZK-J3X is a DC adjustable constant voltage constant current step down power supply module with LCD display.HD display input voltage and output voltage, current, power and display status.Adjustable stable output voltage and current.Set output current to meet the require.It can be used as ordinary buck power supply module, charger and LED constant current driver.Simple and efficient, practical.
1>.High precision calibration
2>.High current output
3>.Support anti-reverse protection
4>.Support over-current protection
5>.Support over-voltage protection
6>.Support charging mode
7>.Support short circuit protection
8>.High-definition LCD display
9>.Multiple parameters are displayed simultaneously
10>.Ultra low voltage output
11>.With high quality acrylic shell
12>.Support enabled/disabled output
13>.Support display input voltage
14>.Support display output voltage, current, power
15>.Dual input and output interface and DC005 input and USB output
16>.Long rotating handle without tools
1>.Product Name:ZK-J3X 3A Step Down Power Supply Module
3>.Working Voltage:DC 5.0V-27.0V
4>.Output Voltage:DC 1.0V-24.0V
5>.Output Current:3A(Recommended 2.5A)
7>.Voltage Display Precision:+/-0.1V
8>.Voltage Display Resolution:0.01V
9>.Current Display Range:0~3A
10>.Current Display Precision:+/-0.05A
11>.Voltage Display Resolution:0.001A
17>.Short Circuit Protection:Yes
23>.Working Temperature range:-20℃~85℃
24>.Working Humidity range:0%-95%RH
25>.Size without shell:66*48.5*28mm
26>.Size with shell:73.4*55.4*30.5mm
1>.Long press means need keep press for more than 3second.
2>.’+’ Button:Long press to select calibration input voltage and output voltage and output current.Short press to set calibration value.Increase calibration value.
3>.’ - ’ Button:Long press to clear capacity count value.Short press to set calibration value.Reduce calibration value.
4>.SELECT Button:Long press to switch display output current,output power, capacity.Short press to switch display input voltage and output voltage.
5>.ON/OFF Button:Long press is used to restore default settings for next re-power.Short press to select whether output voltage.
6>.CV Potentiometer:Adjust output voltage.Increase the output voltage when rotating clockwise.Note:It is a step down power supply module,so the input voltage must be more 2V than output voltage.E.g input voltage 5V then the maximum output voltage is 3V.Please rotate the CV potentiometer 10 turns in counterclockwise if the output voltage cannot be adjusted.
7>.CC Potentiometer:Adjust output current.Increase the output current when rotating clockwise.Note:It is not keeping a fixed output current.When the load current reaches the set current value, the module starts to fix the output with this current value.
8>.ON LED:Green LED.Output indicator.It will turn ON when there is a output at output terminal.Otherwise it is OFF.
9>.Charge LED:Blue LED.Charging indicator.It will turn ON when charging.
10>.FULL LED:Green LED.Charged fully indicator.It will turn ON when battery is charged fully.E.g it will turn ON if output current is less than 0.2A if the Set Current is 2A.
11>.CC LED:Red LED.Constant current output indicator.It enters the constant current state when the load current reaches the set current and CC constant current indicator turns ON.
12>.Input terminal:There are two input methods:DC005 5.5*2.1mm power supply socket and KF-301-2P 5.08mm blue terminal.Choose one of the input methods when using.
13>.Output terminal:USB Female socket and KF-301-2P 5.08mm blue terminal. Blue terminal can output DC 1.0V-24.0V.Note the USB output is 1.0V-24.0V,too.Not fixed output 5V!
1>.It is used to calibrate input voltage, output voltage and output current.
2>.Long press ‘+’ button.
3>.Short press button ‘SELECT’ to select calibrate input voltage or output voltage or output current.
4>.Short press ‘+’ or ‘-’ to set calibration value.
5>.Calibrate input voltage:Long press ‘+’ button enter SET interface and display ‘SET’ in the lower left corner of the screen.Short press ‘+’ or ‘-’ button to set input voltage calibration value when display ‘IN’ on screen.Exit the SET interface by long press ‘+’ button again.
6>.Calibrate output voltage:Long press ‘+’ button enter SET interface and display ‘SET’ in the lower left corner of the screen.Short press ‘SELECT’ button and then display ‘OUT’.Short press ‘+’ or ‘-’ button to set output voltage calibration value.Exit the SET interface by long press ‘+’ button again.
7>.Calibrate output current:Long press ‘+’ button enter SET interface and display ‘SET’ in the lower left corner of the screen.Short press ‘SELECT’ button twice and then display ‘OUT’.Short press ‘+’ or ‘-’ button to set output current calibration value.Exit the SET interface by long press ‘+’ button again.
1>.Over-Voltage Protection:Module will turn OFF output voltage automatically if output voltage is more then 24.5V.It will display OV.User need turn down output voltage and then press ‘ON/OFF’ button.
2>.Over-Current Protection:Module will turn OFF output automatically if output current is more then 3A.It will display OC.User need reduce load current and then press ‘ON/OFF’ button.
3>.Over-Power Protection:Module will turn OFF output automatically if output power is more then 30W.It will display OP.User need reduce load power and then press ‘ON/OFF’ button.
4>.Current error:Large display error when output current is less than 0.05A.It can not display output current if current is 10~40mA.
5>.Capacity clearing:The user needs to manually clear the display when 99.99Ah is displayed by long press ‘-’ button.
1>.As a ordinary step down power module:
1.1>.Connect right input voltage at input terminal;
1.2>.Adjust CV constant voltage potentiometer to set output voltage according to require.Rotate CV potentiometer counterclockwise more than 10 turns if the output voltage can not be adjusted.
1.3>.Rotate CC potentiometer counterclockwise more than 10 turns at first.
1.4>.Test Output short circuit current by multimeter at 10A or 20A(Connect two Test Probes to output terminal on module)
1.5>.Rotate CC constant current potentiometer clockwise to set output current according to require over-current protection value.
1.6>.Test and using(E.g:Module’s maximum output current is 2A if display 2A on multimeter.Red LED indicator will turn on if output reach to 2A.Otherwise LED is OFF.)
1.7>.The output voltage will decrease due to the current sampling resistor at the output. The higher the current, the more the voltage is reduced.
2>.As a charger:
2.1>.Tops:Power supply module can not be used as charger module if it does not support constant current function.The voltage difference between the battery with insufficient voltage and the charger is very large.Causes excessive charging current even damage the battery.So it need keep charging in constant current mode to reaching a certain level.Then automatically switch back to constant voltage charging.
2.2>.Make sure floating charge voltage and charge current for battery.If the lithium battery’s parameter is 3.7V/2200mAh, then the float charge voltage is 4.2V, and the maximum charging current is 1C, which is 2200mA.
2.3>.Connect right input voltage at input terminal.(Note:Please don’t connect load during set parameter).
2.4>.Test output voltage by multimeter and adjust CV potentiometer to make sure output voltage reach to require floating charge voltage.(If charge a 3.7V lithium battery, adjust the output voltage to 4.2V)
2.5>.Rotate CC potentiometer counterclockwise more than 10 turns at first.
2.6>.Test Output short circuit current by multimeter at 10A or 20A(Connect two Test Probes to output terminal on module)
2.7>.Rotate CC constant current potentiometer clockwise to set output current according to require charge current value.
2.8>.Connect battery at output terminal and start to charging.
3>.As a high power LED constant current driver:
3.1>.Make sure LED working current and maximum working voltage.
3.2>.Connect right input voltage at input terminal.(Note:Please don’t connect load during set parameter).
3.3>.Test output voltage by multimeter at output terminal and adjust CV potentiometer to set output voltage to LED’s maximum working voltage.
3.4>.Rotate CC potentiometer counterclockwise more than 10 turns.
3.5>.Test Output short circuit current by multimeter at 10A or 20A(Connect two Test Probes to output terminal on module)
3.6>.Rotate CC constant current potentiometer clockwise to set output current according to require LED working current.
3.7>.Connect LED and test.
1>.It is a step down power supply module,So the output voltage must be lower than input voltage.Otherwise it will not working normally.
2>.It is a DC power module,So it can not connect to AC power.
3>.Please don’t short output.
4>.Input voltage must be 2V higher than output voltage.
5>.Please connect input voltage after connect battery when use as charge and make sure output voltage is higher than battery voltage.It is recommended to serial a anti-backflow diode at input positive terminal.
6>.’IN-’ and ‘OUT-’ can not be connect together,otherwise module can not support constant current output.
7>.Please make sure input power is more than load power.
8>.Please step down output power if module is hot.
9>.Rotate CV potentiometer counterclockwise more than 10 turns if the output voltage can not be adjusted.
10>.The USB output is not fixed at 5V,it maybe 1V~24V.So please careful when use USB!
11>.Please read use manual and description before use.
1>.Ordinary power supply;
3>.LED drive power;
4>.Instrument voltage display;
1>.1pcs ZK-J3X 3A Step Down Power Supply Module;
2>.1pcs 20*14*6mm Heat Sink;
3>.4pcs Acrylic shell;
4>.4pcs M3*12mm Copper column;
5>.4pcs M3*10+6mm Copper column;
6>.8pcs M3*6mm Screw.
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