Diodes AP1510 User Manual

AP1510

PWM CONTROL 3A STEP-DOWN CONVERTER

Features

• Input voltage: 3.6V to 23V

• Output voltage: 0.8V to V

• Duty ratio: 0% to 100% PWM control

• Oscillation frequency: 300kHz typ.

• Current Limit, Enable function

• Thermal Shutdown function

• Built-in internal SW P-channel MOS

• SOP-8L Pb-Free Package

• SOP-8L: Available in “Green” Molding Compound

(No Br, Sb)

• Lead Free Finish/ RoHS Compliant (Note 1)

.

CC

Applications

• Cellular Phones

• PC Motherboard

• LCD Monitor

• Graphic Card

• DVD-Video Player

• Telecom Equipment

• ADSL Modem

• Printer and other Peripheral Equipment

• Microprocessor core supply

• Networking power supply

Typical Application Circuit

V

IN

C

IN

470uF

R

3.9K

CVcc

0.1uF

OCSET

C
Option

R

EN

100K

C

EN

0.1uF

OCSET

Vcc

OCSET

EN

AP1510

General Description

AP1510 consists of step-down switching regulator with PWM
control. These devices include a reference voltage source,
oscillation circuit, error amplifier and internal PMOS.

AP1510 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 100%. This converter also
contains an error amplifier circuit. An enable function, an over
current protection and a short circuit protection are built inside,
when OCP or SCP happens, the operation frequency will be
reduced from 300kHz to 30kHz. 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 package, providing such outstanding features as low
current consumption. Since this converter can accommodate an
input voltage up to 23V, it is also suitable for the operation via an
AC adapter.

V

=5V/3A

Output

FB

V

SS

L1

22uH

C

Optional

D1

R

C

A

6.8K

R

B

1.3K

OUT

+

+

C

0.1uF 470uF

-

-

C

OUT

Note: V
R

= VFB x (1+RA/RB)

OUT

=0.7K~5K ohm

B

AP1510 Rev. 7 1 of 9 JULY 2009
DS31018 www.diodes.com © Diodes Incorporated

Ordering Information

PWM CONTROL 3A STEP-DOWN CONVERTER

AP1510 S X - 13

AP1510

Package Packing

Device

AP1510SL-13 S SOP-8L 2500/Tape & Reel -13

Lead-free

AP1510SG-13 S SOP-8L 2500/Tape & Reel -13

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)

Lead Free

L : Lead Free

G : Green

13 : Tape & ReelS : SOP-8L

13” Tape and Reel

Quantity Part Number Suffix

Pin Assignments

( Top View )

FB

EN

OCSET

CC

V

1

2

AP1510

3

4

8

7

6

5

Vss

Vss

Output

Output

SOP-8L

Pin Descriptions

Pin Name Pin NO. Description

FB 1 Feedback pin.

Enable Input pin
H: Normal operation

EN 2

OCSET 3 Add an external resistor to set max output current.

VCC 4 IC power supply pin

Output 5, 6

VSS 7, 8 GND Pin

AP1510 Rev. 7 2 of 9 JULY 2009
DS31018 www.diodes.com © Diodes Incorporated

(Step-down operation)
L: Step-down operation stopped
(All circuits deactivated)

Switch Pin. Connect external inductor/diode here. Minimize trace area at this
pin to reduce EMI.

y

Block Diagram

AP1510

PWM CONTROL 3A STEP-DOWN CONVERTER

Output

Oscillation

Circuit

Reference Voltage

Source with Soft Start

Vcc

PWM-Switched
Control Circuit

+

FB

-

Thermal

Shutdown

EN

EN

100uA

OCSET

VssV

Absolute Maximum Ratings

Symbol Parameter Rating Unit

V

V

CC

V

Feedback Pin Voltage V

FB

V

EN Pin Voltage V

EN

V

Switch Pin Voltage VSS - 0.3 to VIN + 0.3 V

OUT

P

Power Dissipation Internall

D

T

Operating Junction Temperature Range -20 to +125

OP

T

Storage Temperature Range -65 to +150

ST

Caution: The absolute maximum ratings are rated values exceeding which the product could suffer physical damage. These values must therefore not be
exceeded under any conditions.

Pin Voltage VSS - 0.3 to VSS + 25 V

CC

- 0.3 to VCC V

SS

- 0.3 to VIN + 0.3 V

SS

limited mW

o

C

o

C

Recommended Operating Conditions

Symbol Parameter Min Max Unit

VIN Input Voltage 3.6 23 V

I

Output Current 0 3 A

OUT

TA Operating Ambient Temperature -25 85

o

C

AP1510 Rev. 7 3 of 9 JULY 2009
DS31018 www.diodes.com © Diodes Incorporated