APW7176A Просмотр технического описания (PDF) - Anpec Electronics

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APW7176A

Dual 1.5MHz, 1A Synchronous Step-Down Converter

Anpec Electronics 

APW7176A

Application Information (Cont.)

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 the GND. Connecting the capacitor and VIN/GND

with short and wide trace without any via holes for good

input voltage filtering.

2. The high current paths (GND1/GND2, IN1/IN2, and SW1/

SW2) should be placed very close to the device with

short, direct and wide traces.

3. To minimize copper trace connections that can inject

noise into the system, the inductor should be placed as

close as possible to the SW pin to minimize the noise

coupling into other circuits.

4. 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 feedback

network should be shielded with a ground plane or

trace to minimize noise coupling into this circuit.

5. A star ground connection or ground plane minimizes

ground shifts and noise is recommended.

Copyright © ANPEC Electronics Corp.

11

Rev. A.1 - Oct., 2012

www.anpec.com.tw

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