AX4102 데이터 시트보기 (PDF) - Unspecified

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AX4102

PWM Control 3.5A Step-Down Converter

Unspecified 

授权代理商：深圳市四海恒通科技有限公司

电话：0755-8398 3377 135 9011 2223

http://www.gofotech.com

AX4102

™ APPLICATION CIRCUIT

VIN+12V

C2 C3

470uF 0.1uF

R4

100K

R3

1.5K

ON/OFF

C6

0.1uF

AX4102

1 FB

VSS 8

2 EN

VSS 7

3 OCSET SW 6

4 VCC

SW 5

R1

VOUT = VFB x (1 + R2 )

VFB = 0.8V ; R2 suggest 0.8K ~ 6k

L1

1

2

22uH

R1

D1

30K

B340

R2

5.6K

VOUT = 5V/3.5A

C1

1nF

C8

C4

0.1uF 470uF

VOUT

IOUT=3.5A

L1 recommend value (VIN=12V )

1.8 V

2.5V

3.3V

12uH

15uH

18uH

5V

22uH

™ FUNCTION DESCRIPTIONS

PWM Control

The AX4102 consists of DC/DC converters that employ a pulse-width modulation

(PWM) system. In converters of the AX4102, the pulse width varies in a range from 0 to

100%, 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.

RDS (ON) Current Limiting

The current limit threshold is setting by the external resistor (R3) connecting from VCC

supply to OCSET pin. The internal 130uA sink current crossing the resistor sets the voltage

at pin of OCSET. When the PWM voltage is less than the voltage at OCSET, an

over-current condition is triggered. Please refer to the formula for setting the current limit

value:

ISW(MIN)

=

IOCSET × R3 +

RDS(ON)

0.08

(Normally, The ISW(MAX) setting more than IOUT 1.0A ).

4/9

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

Rev.1.6 Aug.06, 2010

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