AX5201 데이터 시트보기 (PDF) - Unspecified

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AX5201

Step-up PWM DC/DC Converter

Unspecified 

AX5201

 APPLICATION CIRCUIT

VCC=5V

R1

100K

C1

470uF

C7

0.1uF

C3

Option

C2

0.47uF

L1

22uH

U1

1 EN

2 Vcc

3 FB

4 SS

AX5201

C8

0.47uF

SGND 8

PGND 7

SW 6

SW 5

D1

B340A

Vout=12V

C4

C5

R4

11K

470uF 4.7uF

R3

1K

VOUT = VFB  (1 + R4 ), VFB = 1.0V, R3 = 1K ~ 3KΩ

R3

 FUNCTION DESCRIPTIONS

PWM Control

The AX5201 consists of DC/DC converters that employ a pulse-width modulation

(PWM) system. In converters of the AX5201, the pulse width varies in a range from 0 to

85%, according to the load current. The ripple voltage produced by the switching can easily

be removed through a filter because the switching frequency remains constant. Therefore,

these converters provide a low-ripple power over broad ranges of input voltage and load

current.

Setting the Output Voltage

Application circuit item shows the basic application circuit with AX5201 adjustable

output version. The external resistor sets the output voltage according to the following

equation:

V OUT

 1.0V

 1



R4 

R3 

4/10

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

Rev.1.4 Jan.25, 2011

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