Diodes AP1538 Manuel d'utilisateur télécharger pdf

AP1538

18V 3A 300KHz BUCK CONVERTER

AP1538 Rev. 5 1 of 13 OCTOBER 2009

DS31451 www.diodes.com © Diodes Incorporated

• Input voltage : 3.6V to 18V

• Output voltage : 0.8V to V

• 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)

• Lead Free Finish / RoHS Compliant (Note 1)

AP1538 consists of step-down switching regulator with

PWM control. These devices include a reference voltage source,

oscillation circuit, error amplifier, internal PMOS.

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.

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.

• PC Motherboard

• LCD Monitor

• Graphic Card

• DVD-Video Player

• Telecom Equipment

• ADSL Modem

• Printer and other Peripheral Equipment

• Microprocessor core supply

Typical Application Circuit

AP 1538

D1**

Vcc

Output

CVcc

OUT

= 5V/3A

OCSET

OUT

Option*

OCSET

Option

100K

22uH

6.8K

1.3K

0.1uF

470uF

***

470uF

0.1uF

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

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

*** Suggested C

OUT

for V

OUT

< 1V; 680uF.

OUT

x (

)

= 0.7K~5K ohm

Features

General Description

Applications

1 2 3 4 5 6 ... 12 13

Résumé du contenu

Page 1 - Applications

AP153818V 3A 300KHz BUCK CONVERTER AP1538 Rev. 5 1 of 13

Page 2 - Ordering Information

AP153818V 3A 300KHz BUCK CONVERTER AP1538 Rev. 5 10 of 13

Page 3 - Block Diagram

AP153818V 3A 300KHz BUCK CONVERTER AP1538 Rev. 5 11 of 13

Page 4 - Absolute Maximum Ratings

AP153818V 3A 300KHz BUCK CONVERTER AP1538 Rev. 5 12 of 13

Page 5 - Electrical Characteristics

AP153818V 3A 300KHz BUCK CONVERTER AP1538 Rev. 5 13 of 13

Page 6

AP153818V 3A 300KHz BUCK CONVERTER AP1538 Rev. 5 2 of 13

Page 7

AP153818V 3A 300KHz BUCK CONVERTER AP1538 Rev. 5 3 of 13

Page 8 - Test Circuit

AP153818V 3A 300KHz BUCK CONVERTER AP1538 Rev. 5 4 of 13

Page 9 - Functional Description

AP153818V 3A 300KHz BUCK CONVERTER AP1538 Rev. 5 5 of 13

Page 10 - Diodes Incorporated

AP153818V 3A 300KHz BUCK CONVERTER AP1538 Rev. 5 6 of 13

Page 11 - Marking Information

AP153818V 3A 300KHz BUCK CONVERTER AP1538 Rev. 5 7 of 13

Page 12 -

AP153818V 3A 300KHz BUCK CONVERTER AP1538 Rev. 5 8 of 13

Page 13 - 18V 3A 300KHz BUCK CONVERTER

AP153818V 3A 300KHz BUCK CONVERTER AP1538 Rev. 5 9 of 13

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