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AP1506

150KHz, 3A PWM BUCK DC/DC CONVERTER

AP1506

Document number: DS31015 Rev. 7 - 2

1 of 14

www.diodes.com

June 2010

Description

The AP1506 series are monolithic IC designed for a step-

down DC/DC converter, and own the ability of driving a 3A

load without external transistor. Due to reducing the number

of external components, the board space can be saved easily.

The external shutdown function can be controlled by logic

level and then come into standby mode. The internal

compensation makes feedback control have good line and

load regulation without external design. Regarding protected

function, thermal shutdown is to prevent over temperature

operating from damage, and current limit is to prevent over

current operating of the output switch. If current limit function

occurred and V

is down to 0.5V below, the switching

frequency will be reduced. The AP1506 series operate at a

switching frequency of 150KHz thus allowing smaller sized

filter components than what would be needed with lower

frequency switching regulators. Other features include a

guaranteed +

4% tolerance on output voltage under specified

input voltage and output load conditions, and +

15% on the

oscillator frequency. The output version included fixed 3.3V,

5V, 12V, and an adjustable type. The packages are available

in a standard 5-lead TO263 and TO220.

Features

• Output Voltage: 3.3V, 5V, 12V and Adjustable Output

Version

• Adjustable Version Output Voltage Range, 1.23V to

18V+4%

• 150KHz +15% Fixed Switching Frequency

• Voltage Mode Non-Synchronous PWM Control

• Thermal-Shutdown and Current-Limit Protection

• ON/OFF Shutdown Control Input

• Operating Voltage can be up to 22V

• Output Load Current: 3A

• Lead Free packages: TO263-5L and TO220-5L(R)

• TO263-5L and TO220-5L(R): Available in “Green”

Molding Compound (No Br, Sb)

• Low Power standby mode

• Built-in Switching Transistor On Chip

• Lead Free Finish/RoHS Compliant (Note 1)

Pin Assignments

( Top View )

1 V

5 SD

4 FB

3 Gnd

2 Output

Metal Tab GND

TO263-5L

1 V

5 SD

4 FB

3 Gnd

2 Output

( Top View )

TO220-5L/TO220-5L(R)

Applications

• Simple High-Efficiency Step-Down Regulator

• On-Card Switching Regulators

• Positive to Negative Converter

Notes: 1. EU Directive 2002/95/EC (RoHS). All applicable RoHS exemptions applied. Please visit our website at

http://www.diodes.com/products/lead_free.html

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Résumé du contenu

Page 1 - Metal Tab GND

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Page 2 - Typical Application Circuit

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Page 3 - Functional Block Diagram

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Page 4 - Absolute Maximum Ratings

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Page 7 - Functional Description

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Page 9

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Page 10 - Threshold Voltage (V)

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Page 11 - June 2010

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Page 12 - Marking Information

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