Diodes AP1501A User Manual

AP1501A

150KHz, 5A PWM BUCK DC/DC CONVERTER

Features

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

• Adjustable version output vo l tag e range, 1.23V to

• 150Khz +

• 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 standb y 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”

• Lead Free Finish/ RoHS Compliant (Note 1)

4%

37V+

Molding Compound (No Br, Sb)

15% fixed switching frequency

Applications

• Simple High-efficiency step-down regulator

• On-card switching regulators

• Positive to negative converter

Typical Application Circuit

(1) Fixed Type Circuit

General Description

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 +
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.

15% on the oscillator frequency.

12V

DC Input

Cin

Capacitor

12

Vin

4

AP1501A

-33

SD

FB

35

Gnd

Output

Inductor

D1

Schottky

Diode

L1

18uH

3.3V/5A

Output Load

Co

Capacitor

AP1501A Rev. 10 1 of 14 SEPTEMBER 2009

DS31191

www.diodes.com © Diodes Incorporated

×

AP1501A

150KHz, 5A PWM BUCK DC/DC CONVERTER

Typical Application Circuit (Continued)

(2) Adjustable Type Circuit

R2

FB

12V

DC Input

Cin

Capacitor

(3) Delay Start Circuit

12

Vin

V

V
R2 = 1K ~ 3K

AP1501A

SD

= V

out

= 1.23V

FB

4

Output

35

Gnd

R1

(1 +

FB

)

R2

R1

L1

22uH

D1

Schottky Diode

5V/ 5A

Output Load

Co

Capacitor

12V

DC Input

Cin

Capacitor

R2

FB

4

12

AP1501A

SD

R

DELAY

10K

C

DELAY

0.1uF

Vin

Output

35

Gnd

R1

L1

22uH

D1

Schottky Diode

5V/ 5A

Output Lo ad

Co

Capacitor

AP1501A Rev. 10 2 of 14 SEPTEMBER 2009

DS31191

www.diodes.com © Diodes Incorporated

Ordering Information

AP1501A

150KHz, 5A PWM BUCK DC/DC CONVERTER

AP1501A - XX

XXX X - X

Output Version

Blank : Adjustable

33 : 3.3V
50 : 5.0V
12 : 12V

Package

K5 : TO263-5L
T5 : TO220-5L

T5R : TO220-5L(R)

Lead Free

L : Lead Free

G : Green

Packing

U : Tube
13 : Tape & Reel

Device

Lead-free

AP1501A-XXK5L-U K5 TO263-5L 50 -U NA NA

Lead-free

AP1501A-XXK5L-13 K5 TO263-5L NA NA 800/Tape & Reel -13
AP1501A-XXK5G-U K5 TO263-5L 50 -U NA NA
AP1501A-XXK5G-13 K5 TO263-5L NA NA 800/Tape & Reel -13
AP1501A-XXT5L-U T5 TO220-5L 50 -U NA NA

Lead-free

AP1501A-XXT5G-U T5 TO220-5L 50 -U NA NA
AP1501A-XXT5RL-U T5R TO220-5L(R) 50 -U NA NA

Lead-free

AP1501A-XXT5RG-U T5R TO220-5L(R) 50 -U NA NA

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

http://www.diodes.com/datasheets/ap02001.pdf.

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

2. Pad layout as shown on Diodes Inc. suggested pad layout document AP02001, which can be found on our website at

Package

Code

Packaging

(Note 2)

Quantity Part Number

Tube 13” Tape and Reel

Quantity Part Number

Suffix

Suffix

Pin Assignments

( Top View )

( Top View )

5 SD
4 FB
3 Gnd
2 Output
1 V

IN

Metal Tab GND

TO263-5L

5 SD
4 FB
3 Gnd
2 Output

1 V

IN

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

AP1501A Rev. 10 3 of 14 SEPTEMBER 2009

DS31191

www.diodes.com © Diodes Incorporated

AP1501A

Pin Descriptions

Name Description

VIN Operating voltage input

Output Switching output

Gnd Ground

FB Output voltage feedback control
SD ON/OFF shutdown

Block Diagram

150KHz, 5A PWM BUCK DC/DC CONVERTER

SD

V

IN

220mV200mV

FB

Current
Source

bias

1.235V

Reference

+

_

Amp

2.5V

Regulator

Freq.

Compensation

_
Comp

+

Start

up

Comp

Comp

Pre-driver

+

_

_

+

5A

Switch

Output

150kHz

OSC.

Thermal

Shutdown

Gnd

AP1501A Rev. 10 4 of 14 SEPTEMBER 2009

DS31191

www.diodes.com © Diodes Incorporated

AP1501A

150KHz, 5A PWM BUCK DC/DC CONVERTER

Absolute Maximum Ratings

Symbol Parameter Rating Unit

ESD MM Machine Model ESD Protection 400 V

VCC Supply Voltage +45 V
VSD ON/OFF Pin input voltage -0.3 to +40 V
VFB Feedback Pin voltage -0.3 to +40 V

V

Output voltage to Ground -1 V

OUT

PD Power dissipation Internally limited W

TST Storage temperature -65 to +150

TJ Operating Junction Temperature -20 to +125

Recommended Operating Conditions

Symbol Parameter Rating Units

VOP Operating voltage 4.5 to 40 V

TA Operating Ambient Temperature -20 to 85

o

C

o

C

o

C

AP1501A Rev. 10 5 of 14 SEPTEMBER 2009

DS31191

www.diodes.com © Diodes Incorporated