APW7207A datasheet(11/18 Pages) ANPEC

11 / 18 page

Rev. A.7 - Nov., 2012

APW7207/A

www.anpec.com.tw

Layout Consideration

For all switching power supplies, the layout is an impor-

tant step in the design; especially at high peak currents

and switching frequencies. If the layout is not carefully

done, the regulator might show noise problems and duty

cycle jitter.

1. The input capacitor should be placed close to the VIN

and GND. Connecting the capacitor with VIN and GND

pins by short and wide tracks without using any vias for

filtering and minimizing the input voltage ripple.

2. The inductor should be placed as close as possible to

the LX pin to minimize length of the copper tracks as

well as the noise coupling into other circuits.

3. Since the feedback pin and network is a high imped-

ance circuit, the feedback network should be routed

away from the inductor. The feedback pin and feed-

back network should be shielded with a ground plane

or track to minimize noise coupling into this circuit.

4. A star ground connection or ground plane minimizes

ground shifts and noise is recommended.

Application Information (Cont.)

To Anode of

WLEDs

From Cathod of

WLEDs

Via To OVP

Via To VOVP

VEN

VIN

Refer to Fig. 1

Fig 4. APW7207/A Layout Suggestion

VOVP

GND

VIN

VOVP

To Anode of

WLEDs

From Cathod of

WLEDs

Via To VOVP

VEN

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