48V DC Input DC-DC Converter – 5V USB C-Type Output

This DC-DC converter board is specifically designed as a USB C-Type power source, providing a stable 5V output with a maximum current up to 2A. The converter’s wide input voltage range of 4.5V to 48V ensures flexibility and compatibility with various power sources. Key features of the DC-DC converter include excellent load and line regulation, which enable it to maintain a stable output voltage despite changes in input voltage or load current. Additionally, the converter incorporates robust fault condition protection mechanisms, such as cycle-by-cycle current limiting and thermal shutdown, to prevent damage from overcurrent or overheating.

The circuit operates at a fixed frequency of 100kHz, ensuring efficient and reliable performance. For convenient connection, the board features screw terminals for the input supply and a USB-C connector for the output. An additional 2-pin header connector is also provided for alternative output access. Furthermore, an onboard LED indicator provides visual confirmation of the output status, allowing for easy monitoring and troubleshooting.

Features

• Input Power 4.5V to 48V
• Output 5V USB C-Type
• Output Current Up to 2Amps
• Operation Frequency 100Khz
• On Board Output LED
• Screw Terminal for Power Input
• USB-C Type Connector for 5V Output
• 2 Pin Header Connector Output 5V
• 4X3MM PCB Mounting Holes
• PCB Dimensions 52.71 x 24.77 mm

The MP2494 is a current-mode buck regulator. That is, the EA output voltage is proportional to the peak inductor current. At the beginning of a cycle SW is off; the EA output voltage is higher than the current sense amplifier output; and the current comparator’s output is low. The rising edge of the 100kHz CLK signal sets the RS Flip-Flop. Its output turns on SW thus connecting the SW pin and inductor to the input supply. The increasing inductor current is sensed and amplified by the Current Sense Amplifier. Ramp compensation is summed to Current Sense Amplifier output and compared to the Error Amplifier output by the Current Comparator. When the Current Sense Amplifier plus Slope Compensation signal exceeds the EA output voltage, the RS Flip-Flop is reset and the MP2494 reverts to its initial SW off state. If the Current Sense Amplifier plus Slope Compensation signal does not exceed the COMP voltage, then the falling edge of the CLK resets the Flip-Flop. The output of the Error Amplifier integrates the voltage difference between the feedback and the 0.8V bandgap reference. The polarity is such that an FB pin voltage lower than 0.8V increases the EA output voltage. Since the EA output voltage is proportional to the peak inductor current, an increase in its voltage increases current delivered to the output. An external Schottky Diode (D1) carries the inductor current when SW is off. Enable Control the MP2494 has an Enable control pin (EN). Drive EN above 1.8V to turn on the MP2494. Drive EN below 0.4V to turn it off. Tie EN to VIN for automatic start up.

Connections

• CN1 Power Input: Pin 1 4.5V to 48V DC, Pin 2 = GND
• CN2 Power Output: Pin 1 = 5V DC Output, Pin 2 = GND
• CN3 USB C-Type: USB C Type 5V Output
• D2 Output Power LED

Schematic

Parts List

Connections

Block Diagram

Gerber View

Photos

Video

MP2494 Datasheet