Diodes AP1501A Manuel d'utilisateur télécharger pdf

AP1501A

150KHz, 5A PWM BUCK DC/DC CONVERTER

AP1501A Rev. 10 1 of 14 SEPTEMBER 2009

DS31191

www.diodes.com © Diodes Incorporated

• Output voltage: 3.3V, 5V, 12V and adjustable output

version

• Adjustable version output voltage range, 1.23V to

37V+

• 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 40V

• Output load current: 5A

• Low power standby mode

• Built-in switching transistor on chip

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

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

Molding Compound (No Br, Sb)

• Lead Free Finish/ RoHS Compliant (Note 1)

The AP1501A series are monolithic ICs that are designed for a

step-down DC/DC converter, and possess the ability to drive a

5A load without additional transistor component. Due to reducing

the number of external component, 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 against over current operating of the

output switch. The AP1501A series operates 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 includes fixed 3.3V, 5V, 12V, and an

adjustable type. The packages are available in a standard 5-lead

TO263 and TO220 packages.

• Simple High-efficiency step-down regulator

• On-card switching regulators

• Positive to negative converter

Typical Application Circuit

(1) Fixed Type Circuit

12V

DC Input

Cin

Capacitor

Schottky

Diode

Vin

Gnd

Output

AP1501A

-33

Capacitor

Inductor

18uH

3.3V/5A

Output Load

Features

General Description

Applications

1 2 3 4 5 6 ... 13 14

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