A7431
DC-DC CONVERTER BUCK (STEP-DOWN)
42V 3A CC/CV
AiT Semiconductor Inc.
www.ait-ic.com
PC Board Layout Guidance
Figure8 showed the example of components placement and PCB layout. When laying out the printed circuit
board, the following checklist should be used to ensure proper operation of the IC.
1) Arrange the power components to reduce the AC loop size，consisting of input ceramic capacitor C1, VIN
pin, SW pin and the schottky diode D1.
2) Place input decoupling ceramic capacitor C1 as close to VIN pin as possible. C1 is connected power GND
with vias or short and wide path.
3) Return FB, COMP and ISET to signal GND pin, and connect the signal GND to power GND at a single
point for best noise immunity. Connect exposed pad to power ground copper area with copper and vias.
4) Use copper plane for power GND for best heat dissipation and noise immunity.
5) Place feedback resistor close to FB pin.
6) Use short trace connecting BS-C5-SW loop.
Figure 8: Example of PCB Layout
Figure 9. Typical Efficiency Curve
REV1.1
- JAN 2016 RELEASED, SEP 2016 UPDATED -
- 13 -
AITSEMI [ AiT Semiconductor ]
