ACT4303 datasheet(9/15 Pages) ACTIVE-SEMI

9 / 15 page

ACT4303

Rev 0, 05-Dec-11

Active-Semi

Innovative Power

- 9 -

www.active-semi.com

STABILITY COMPENSATION CONT’D

PC Board Layout Guidance

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 CIN, IN pin, SW pin

and the schottky diode.

2) Place input decoupling ceramic capacitor CIN as

close to IN pin as possible. CIN 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 HSB-CHSB-SW loop

Figure 6 shows an example of PCB layout.

Figure 7 gives a typical application schematic and

associated BOM list.

Figure 6: PCB Layout

ACT4303 数据表(PDF) 9 Page - Active-Semi, Inc