6/11

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

Rev.1.5 Nov.06, 2019

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

VOUT=12V

VCC=5V

R4

11K

R3

1K

L2

2.2uH

C10

0.1uF

C9

330uF

U1

AX5201

EN

VCC

FB

SS

SW

SW

PGND

SGND

D1 B340A

L1

22uH

C5

4.7uF

C4

470uF

C7

0.1uF

C1

470uF

R1

100K

C3

Option

C8

0.47uF