XL4016 300W Step Down Buck Converter, 9A DC-DC 5-40V to 1.2-35V High Power Efficiency Step Down Converter Power Supply in Pakistan.

Model = XL4016 300W 9A Step Down Buck Converter
Module Properties: non-isolated step-Down module (Buck)
Input Voltage: DC 5-30V
Output Voltage: Output Current:9A (MAX)
Input Current: 16A (MAX) (Please enhance heat dissipation if over 9A)
Output Power: natural cooling 82W (MAX), enhance heat dissipation 120W (MAX)
Output Ripple: 2% (MAX) 20M Bandwidth
Operating Temperature: Industrial grade (-40°C to +85°C) (ambient temperature exceeds 40°C, please lower power use, or enhance heat dissipation)
Full Load Temperature rise: 45°C
No-load Current: Typical 25mA
Voltage Regulation: ± 0.5%
Dynamic Response Speed: 5% 200uS
Short Circuit Protection: None (Please install fuse or protective circuit at the input port)
Input Reverse Polarity Protection: None (Please series diode at the input port)

About Xl4016 9A Buck Stepdown Module In Pakistan
When module work at high power, high temperature, please enhance heatsink/install fan. please make sure that the heatsink temperature do not exceed 80°C.
Input cannot be reverse connection. Output cannot be short-circuit 12V battery output cannot less than 10.5V.

9A Buck Step Down XL4016 Step Down:

100% brand new and high quality
Use a dedicated benchmark IC, and high-precision current sensing resistor, can make more stable constant current
High output current, the max output current can reach 9A.
Low output ripple , high frequency capacitor reduces output ripple.
Suitable for LED driver.
Specifications:
Material: PCB board and electronic component
Color: as the pic shows
Input voltage: 5-40V
Output voltage: 1.2-35V (continuously adjustable)
Output Current: 9A (power tube temperature exceeds 65°C please add cooling fan)
Constant current range:0.2-9A ( adjustable )
Output Power: Maximum power is about 300W (power tube temperature exceeds 65°C please add cooling fan)
Size: Approx. 2.55*1.88*0.94inch / 6.5*4.8*2.4cm(Length*width*thickness)

DC-to-DC converters are used in portable electronic devices such as cellular phones and laptop computers, which are supplied with power from batteries primarily. Such electronic devices often contain several sub-circuits, each with its own voltage level requirement different from that supplied by the battery or an external supply (sometimes higher or lower than the supply voltage). Additionally, the battery voltage declines as its stored energy is drained. Switched DC to DC converters offer a method to increase voltage from a partially lowered battery voltage thereby saving space instead of using multiple batteries to accomplish the same thing.

Most DC-to-DC converter circuits also regulate the output voltage. Some exceptions include high-efficiency LED power sources, which are a kind of DC to DC converter that regulates the current through the LEDs, and simple charge pumps which double or triple the output voltage.

en.wikipedia.org