24-W, 120-VAC to 24-VDC High-Voltage BuckReference Design
1 Description
This reference design uses a TL2842B as a high-side buck to convert a 120-VAC input to a 24-VDC output capable of 1-A loading. At full load it achieves a low peak-to-peak output ripple and over 88% efficiency at full load. This reference design was built using a 2-layer PCB and single-sided assembly.
Figure 1-1 PCB Top
Figure 1-2 Schematic2 Test Prerequisites
2.1 Voltage and Current Requirements
| Parameter | Specifications |
|---|---|
|
Input voltage range |
108–132 VAC, 60 Hz |
|
Output Voltage |
24 VDC, ±1% |
|
Max output current |
1 A |
2.2 Considerations
An electronic load was used for all tests.
Unless noted, all waveforms were captured at full load with a 120-VAC, 60-Hz input.
2.3 Dimensions
The PCB is a two-layer, 1 oz per layer design. The dimensions are 2.5 in × 2.75 in with a max component height is 0.84 in.
