USB DC-DC step-down module

Description :

Only 6-20V

Output current is 3A, long-term operation is 2.1A, and the margin is sufficient.

The new design scheme is adopted, and the circuit design does not require electrolytic capacitors and tantalum capacitors (electrolytic capacitors have a short life, and tantalum capacitors are at risk of explosion). Three large-size solid ceramic capacitors (MCC) used in high-end circuits are used.

The ripple is very low, 12V to 5V 3A is only about 10 millivolts, and many peers have ripples of 500 millivolts or more, which will cause invisible damage to the equipment, and seriously cause abnormal operation or damage of the equipment. 

The new scheme adopts synchronous rectification, and the circuit conversion efficiency is very high. When 6.5V is converted to 5V 0.7A, the efficiency is as high as 97.5%, and when 12V is converted to 5V 1A, it also reaches 94%, unlike some peers whose efficiency is only 60-70%. (The efficiency test removes the voltage drop of the input reverse protection diode and fuse).

 Adopt flat copper wire inductor to maximize conversion efficiency and reduce heat generation.

With output overvoltage protection function, input has 1.5A fuse, output 5V has 300W TVS tube for overvoltage clamp protection, protect USB devices.

Now peer USB modules do not have overvoltage protection function, which poses a great safety hazard to USB devices. If the module breaks down, 12V is directly added to your iPhone, can your iPhone still be spared?

Adopt new USB identification circuit, compatible with iPhone, most Android phones, and iPad.

Short head gold-plated borderless USB, super long service life, incomparable to ordinary USB interface.

Output voltage indicator (red)

The input has a reverse protection diode, and the positive and negative poles of the input will not be damaged if they are reversed (the test efficiency of our store ignores the voltage drop of the input diode and fuse)

Ultra-low quiescent current, quiescent current 0.85 mA. No switch is required when connected to the car battery. It can be connected to the initiator line or the ACC power line.

Model number :QS-1205CBUL-3A power module

Module parameters

Module properties: non-isolated module (BUCK) synchronous rectification

Input voltage: DC 6-20V

Output voltage: 5.1-5.2V

Output current: maximum 3A (please pay attention to heat dissipation when fully loaded). In actual testing, the input is 12V and the output is within 2A, so no special heat dissipation treatment is required.

 Conversion efficiency: 97.5% (6.5 to 5V 0.7A) (test value after short-circuiting reverse protection and fuse)

Switching frequency: 500KHz

Output ripple: about 10mV (12V to 5V3A) 20M bandwidth

Output indication: output voltage indicator is red

Operating temperature: industrial grade (-40℃ to +85℃) (the higher the ambient temperature, the lower the output power)

Output overvoltage protection: yes, input 1.5A fuse, output 5V has 300W TVS tube clamp protection.

 Full load temperature rise: 30℃

Quiet current: 0.85 mA

Load adjustment rate: ±1%

Voltage adjustment rate: ±0.5%

Dynamic response speed: 5% 200uS

Output short circuit protection: Yes, please do not short circuit for a long time

Input reverse protection: Yes, input has reverse protection diode

Wiring method: welding

Input method: welding

Output method: short head