AX5201 데이터 시트보기 (PDF) - Unspecified

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AX5201

Step-up PWM DC/DC Converter

Unspecified 

AX5201

Output Capacitor Selection

The output capacitor is required to keep the output voltage ripple small and to ensure

regulation loop stability. The output capacitor must have low impedance at the switching

frequency. A low ESR capacitor sized for maximum RMS current must be used. The low

ESR requirements needed for low output ripple voltage.

The capacitor voltage rating should be at least 1.5 times greater than the input

voltage, and often much higher voltage ratings are needed to satisfy.

Output Voltage Ripple

Application circuit item shows the basic application circuit with AX5201. The output

voltage ripple (VRIPPLE) very lager at high switch current(ISW=3A, VRIPPLE≒0.7V), external

π filters can reduce output voltage ripple.

π filters

VCC=5V

C1

C7

470uF 0.1uF

R1

100K

C3

Option

L1 22uH

U1

EN SGND

VCC PGND

FB

SW

SS

SW

C8 AX5201

0.47uF

D1 B340A

L2 2.2uH

VOUT=12V

C4

C5

R4

470uF 4.7uF 11K

C9

330uF

C10

0.1uF

R3

1K

6/10

Axelite Confidential Materials, do not copy or distribute without written consent.

Rev.1.4 Jan.25, 2011

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