DC-DC step-down แปลงไฟจาก 4.5~40V เป็น 5V/2A USB charging mobile phone

DC-DC  step-down  แปลงไฟจาก 4.5~40V เป็น 5V/2A 

Two-wire car voltmeter + 5.0V USB charging two in one 

High performance, versatile, intelligent and user-friendly design

Module performance and highlights:

1. Ultra-wide voltmeter range: DC4.5~40V

2. 5V/2A output current capability (output voltage is 6.5~40V to stably output 5.0V )

3. One button ("output enable" button) switch USB output, one button ("low power" button) enters ultra low power consumption

4. The car voltmeter can be self-calibrated, there will never be an inaccuracy of the voltmeter! !

5. With reverse connection protection, reverse connection does not burn

6. With overcurrent, over temperature protection

7. With USB power indicator

8. With terminal block for easy access to the line

9. High efficiency, low ripple

10. Module size: length 58mm width 21mm height 10mm

11. Weight: 13g

Module instructions:

After the module is powered on, the voltage can be detected in real time. When you need to charge the mobile phone, Ipad , MP3 and other digital products, touch the “output enable” button. At this time, the USB power indicator lights up and the USB output 5.0V voltage; When you need to turn off the digital tube, touch the “Low Power” button, the module enters the ultra-low power standby mode, and the USB output is turned off accordingly.

Module use:

Ultra-wide input voltage for car / battery / motorcycles, for monitoring battery voltage, for timely battery status, for a variety of voltage measurement applications.

5.0V , 2A output current capability, enough to meet a variety of USB devices, the voltage is very stable.

Note: This module defaults to D+D- short connection, which is compatible with most mobile phones, and reserves the location of various mobile phone identification resistors. If you need to add identification resistors, please cut off the wires connected to D+D- and join by yourself . Just fine.

The definitions of USB power charging recognition of major manufacturers are as follows:

Samsung: More complicated, some general-purpose designs are not special, and some are short-circuited D+\D-. 

Nokia: D+\D-short 

HTC: D+\D-short 

Microsoft Zune: D+\D-short 

blackberry, MOTO, Sony, Meizu: part D+\D-short, some no recognition circuit, universal 

apple: recognition Resistance, backward compatible short- 

circuit innovation: identification resistance, incompatible short-circuit 

LG: universal design 

ZTE: universal design 

kindle: suspected D+\D- short- circuit 

not mentioned other manufacturers are generally universal design. Of course, there are special circumstances. 

Coupled with Apple's identification circuit, Apple's circuit is compatible with D+ and D- short circuits. 

The USB identification resistor circuit diagram is as follows:

Resistance is: 0805 package 1% accuracy

49.9K*2 logo 4992

75K*1    logo 7502

43K*1    logo 4302

Note: Iphone D+ is connected to 75K D-channel to 43K (pictured), compatible with D+ D-short

IPAD D+ road connection 43K D-road connection 75K (D+D-exchange)

Two-wire vehicle voltmeterSelf-calibration method:

1. When the vehicle voltmeter is in normal working state, press and hold the “ output enable ” button for 2 seconds, then release, the voltmeter flashes, and enter the voltage adjustment mode at this time;

 2. Tap the “ Output Enable ” button, the voltage is increased by one unit, touch the “ Low Power ” button, the voltage is reduced by one unit; since the voltage value of one unit is less than 0.1V , you need to press 1-5 continuously. Only then can the voltmeter be changed by 0.1V . The specific continuous button press depends on the currently displayed voltage value. The higher the current display voltage, the less the number of presses;

3. After the voltage adjustment is completed, press and hold the “ Output Enable ” button for 2 seconds and then release. At this point, the voltage calibration mode can be exited, and all parameter settings are automatically powered down .

Note: This adjustment method allows you to obtain accurate voltage values over the entire voltage range with only one calibration. This function is designed to meet your higher accuracy requirements. Please feel free to use it.