SIP12201 Просмотр технического описания (PDF) - Vishay Semiconductors

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SIP12201

Synchronous Step Down Controller

Vishay Semiconductors 

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when a converter is switching at 500 kHz. However,

noise levels can be minimized by properly laying out

the components. Here are some general guidelines for

laying out a step-down converter with the SiP12201.

Since power traces in step down converters carry pul-

sating current, energy stored in trace inductance dur-

ing the pulse can cause high-frequency ringing with

input and output capacitors. Minimizing the length of

the power traces will minimize the parasitic inductance

in the trace. The same pulsating currents can cause

voltage drops due to the trace resistance and cause

effects such as ground bounce. Increasing the width

of the power trace, which in-creases the cross sec-

tional area, will minimize the trace resistance. In all dc-

to-dc converters the decoupling capacitors should be

placed as close as possible to the pins being decou-

pled to reduce the noise. The connections to both ter-

minals should be as short as possible with low-

inductance (wide) traces. In the SiP12201 converters,

the VIN is decoupled to PGND. It may be necessary to

decouple VDD to AGND, with the decoupling capacitor

being placed adjacent to the pin. AGND and PGND

traces should be isolated from each other and only

connected at a single node such as a "star ground".

SiP12201

Vishay Semiconductors

Document Number: 73541

S-52332–Rev. B, 07-Nov-05

www.vishay.com

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