48V DC Input to 12V Output DC-DC Converter
This DC/DC buck regulator project is based on LMR38020 chip that employs synchronous rectification to achieve high conversion efficiency on a small board. The project operates over a wide input voltage range of 14V to 48V to provide a regulated 12Vdc output at 400kHz switching frequency. The output voltage has better than 1.5% setpoint accuracy. Enable pin is connected to VIN using resistor R2. The device has built-in protection features such as cycle-by-cycle current limit, hiccup mode short-circuit protection, and thermal shutdown in case of excessive power dissipation.
Features
- Tightly regulated output voltage of 12 V with 1.5% setpoint accuracy
- Load Current 1Amp (Can provide Up to 2A), limited due to PCB thermal area.
- Wide input voltage operating range of 14 V to 48 V
- 98% maximum duty cycle
- Operating Frequency 400Khz
- Force PWM operation to achieve low output voltage ripple, tight output voltage regulation at light load
- Frequency synchronization to external clock
- Thermal Shutdown (Threshold 163 Degree Centigrade)
- Hiccup Mode Short-Circuit Protection
- Supports Start-up with Pre-Biased Output
- Cycle-by-cycle overcurrent protection
- PCB Dimensions 29.05 X 25.88 MM
The project provides 12V output with a maximum of 48V input. The input voltage is limited due to the input capacitor voltage rating. The input and output voltage can be changed with a few component adjustments. The IC has a wide input voltage range. The board can support a higher input power supply. Output also can be altered as per user requirements. Refer to the details below for various options. Also, refer to the datasheet of LMR38020 for more info.
12V DC Output, 48V DC Input
- Output Capacitor C2, C3, C4 10uF/10V Ceramic SMD Size 1210
- C5 1nF/10V Ceramic SMD Size 0805
- Resistor R5 100K 1% SMD Size 0805 (Output Feedback Divider Resistor)
- Resistor R4 9.09K 1% SMD Size 0805 (Output Feedback Divider Resistor)
- Resistor R3 64.5K 1% SMD Size (Frequency) 400Khz
- Inductor L1 33uH/5Amp 12x12mm SMD
5V DC Output, 48V DC Input
- Output Capacitor C2, C3, C4 22uF/10V Ceramic SMD Size 1210
- C5 1nF/10V Ceramic SMD Size 0805
- Resistor R5 100K 1% SMD Size 0805 (Output feedback Divider Resistor)
- Resistor R4 24.9K 1% SMD Size 0805 (Output feedback Divider Resistor)
- Resistor R3 64.5K 1% SMD Size 0805 (Frequency) 400Khz
- Inductor L1 15uH/5Amp 12x12mm SMD
24V DC Output, 48V DC Input
- Output Capacitor C2, C3, C4 10uF/10V Ceramic SMD Size 1210
- C5 1nF/10V Ceramic SMD Size 0805
- Resistor R5 100K 1% SMD Size 0805 (Output feedback Divider Resistor)
- Resistor R4 4.32K 1% SMD Size 0805 (Output feedback Divider Resistor)
- Resistor R3 52.3K 1% SMD Size 0805 (Frequency) 500Khz
- Inductor L1 47uH/5Amp 12x12mm SMD
Share
This DC/DC buck regulator project is based on LMR38020 chip that employs synchronous rectification to achieve high conversion efficiency on a small board. The project operates over a wide input voltage range of 14V to 48V to provide a regulated 12Vdc output at 400kHz switching frequency. The output voltage has better than 1.5% setpoint accuracy. Enable pin is connected to VIN using resistor R2. The device has built-in protection features such as cycle-by-cycle current limit, hiccup mode short-circuit protection, and thermal shutdown in case of excessive power dissipation.
Features
- Tightly regulated output voltage of 12 V with 1.5% setpoint accuracy
- Load Current 1Amp (Can provide Up to 2A), limited due to PCB thermal area.
- Wide input voltage operating range of 14 V to 48 V
- 98% maximum duty cycle
- Operating Frequency 400Khz
- Force PWM operation to achieve low output voltage ripple, tight output voltage regulation at light load
- Frequency synchronization to external clock
- Thermal Shutdown (Threshold 163 Degree Centigrade)
- Hiccup Mode Short-Circuit Protection
- Supports Start-up with Pre-Biased Output
- Cycle-by-cycle overcurrent protection
- PCB Dimensions 29.05 X 25.88 MM
The project provides 12V output with a maximum of 48V input. The input voltage is limited due to the input capacitor voltage rating. The input and output voltage can be changed with a few component adjustments. The IC has a wide input voltage range. The board can support a higher input power supply. Output also can be altered as per user requirements. Refer to the details below for various options. Also, refer to the datasheet of LMR38020 for more info.
12V DC Output, 48V DC Input
- Output Capacitor C2, C3, C4 10uF/10V Ceramic SMD Size 1210
- C5 1nF/10V Ceramic SMD Size 0805
- Resistor R5 100K 1% SMD Size 0805 (Output Feedback Divider Resistor)
- Resistor R4 9.09K 1% SMD Size 0805 (Output Feedback Divider Resistor)
- Resistor R3 64.5K 1% SMD Size (Frequency) 400Khz
- Inductor L1 33uH/5Amp 12x12mm SMD
5V DC Output, 48V DC Input
- Output Capacitor C2, C3, C4 22uF/10V Ceramic SMD Size 1210
- C5 1nF/10V Ceramic SMD Size 0805
- Resistor R5 100K 1% SMD Size 0805 (Output feedback Divider Resistor)
- Resistor R4 24.9K 1% SMD Size 0805 (Output feedback Divider Resistor)
- Resistor R3 64.5K 1% SMD Size 0805 (Frequency) 400Khz
- Inductor L1 15uH/5Amp 12x12mm SMD
24V DC Output, 48V DC Input
- Output Capacitor C2, C3, C4 10uF/10V Ceramic SMD Size 1210
- C5 1nF/10V Ceramic SMD Size 0805
- Resistor R5 100K 1% SMD Size 0805 (Output feedback Divider Resistor)
- Resistor R4 4.32K 1% SMD Size 0805 (Output feedback Divider Resistor)
- Resistor R3 52.3K 1% SMD Size 0805 (Frequency) 500Khz
- Inductor L1 47uH/5Amp 12x12mm SMD
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