Datasheet > AP1538_09

AP1538_09

更新时间： 2024-02-24 13:51:18

品牌	Logo	应用领域
美台 - DIODES		转换器
页数	文件大小	规格书
13页	305K
描述
18V 3A 300KHz BUCK CONVERTER

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中文翻译

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AP1538_09 数据手册

AP1538

18V 3A 300KHz BUCK CONVERTER

General Description

Features

AP1538 consists of step-down switching regulator with

PWM control. These devices include a reference voltage source,

oscillation circuit, error amplifier, internal PMOS.

•

Input voltage : 3.6V to 18V

Output voltage : 0.8V to V_CC

Output current : up to 3A

Duty ratio: 0% to 99% PWM control

Oscillation frequency: 300KHz typical

Soft-start like, Current limit and Enable function

Thermal Shutdown function

Built-in internal SW P-channel MOS

SOP-8L and SOP-8L-DEP: Available in “Green”

Molding Compound (No Br, Sb)

AP1538 provides low-ripple power, high efficiency, and excellent

transient characteristics. The PWM control circuit is able to vary

the duty ratio linearly from 0 up to 99%. This converter also

contains an error amplifier circuit as well as a soft-start circuit that

prevents overshoot at startup. An enable function, an over

current protect function and a short circuit protect function are built

inside, and when OCP or SCP happens, the operation frequency

will be reduced from 300KHz to 50KHz. Also, an internal

compensation block is built in to minimum external component

count.

•

Lead Free Finish / RoHS Compliant (Note 1)

With the addition of an internal P-channel Power MOS, a coil,

capacitors, and a diode connected externally, these ICs can

function as step-down switching regulators. They serve as ideal

power supply units for portable devices when coupled with the

SOP-8L and SOP-8L-DEP mini-packages, providing such

outstanding features as low current consumption. Since this

converter can accommodate an input voltage up to 18V, it is also

suitable for the operation via an AC adapter.

Applications

•

PC Motherboard

LCD Monitor

Graphic Card

DVD-Video Player

Telecom Equipment

ADSL Modem

Printer and other Peripheral Equipment

Microprocessor core supply

Typical Application Circuit

_OUT= 5V/3A

Vcc

Output

V_IN

22uH

R_A

6.8K

R_OCSETC_OCSET

AP 1538

Option

Option*

C _IN

OCSET

C_OUT

0.1uF

^470uF***

470uF

V_SS

R_EN

100K

R_B

1.3K

CVcc

0.1uF

D1**

C_EN

0.1uF

V_OUT

x (

R /R_B

V_FB

)

= 0.7K~5K ohm

R_B

Notes: * Typical feedback compensation (Cc): 5600pF.

** Suggested DIODES Power Schottky P/N: B540 series or PDS540.

*** Suggested C

for V

< 1V; 680uF.

OUT

AP1538 Rev. 5

DS31451

1 of 13

www.diodes.com

OCTOBER 2009

12 3 4 5 6 7...13

中文翻译

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与AP1538_09相关器件

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AP1538SDPG-13	DIODES	获取价格	18V 3A 300KHz BUCK CONVERTER
AP1538SDPG-U	DIODES	获取价格	18V 3A 300KHz BUCK CONVERTER
AP1538SG-13	DIODES	获取价格	18V 3A 300KHz BUCK CONVERTER
AP1538SG-U	DIODES	获取价格	18V 3A 300KHz BUCK CONVERTER
AP1539	DIODES	获取价格	18V 4A 300KHz BUCK CONVERTER
AP1539_0910	DIODES	获取价格	18V 4A 300KHz BUCK CONVERTER
AP1539SDPG-13	DIODES	获取价格	18V 4A 300KHz BUCK CONVERTER
AP1539SDPG-U	DIODES	获取价格	Switching Regulator, Voltage-mode, 4A, 400kHz Switching Freq-Max, PDSO8, GREEN, SOP-8
AP1551	ANACHIP	获取价格	150KHz, Dual Channel 2A PWM Buck DC/DC Converter
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