AP4320

Document number: DS36786 Rev. 2 - 2

1 of 11

www.diodes.com

December 2013

© Diodes Incorporated

AP4320

A Product Line of

Diodes Incorporated

CONSTANT VOLTAGE AND CONSTANT CURRENT CONTROLLER

Description

The

AP4320

is

a

highly

integrated

solution

for a constant

voltage/constant current mode SMPS application.

The AP4320 contains one 2.5V voltage reference and two operational

amplifiers.

The

2.5V

voltage

reference,

combined

with

one

operational amplifier, makes of an ideal voltage controller for use in

adapters and battery chargers. The low voltage reference, combined

with another operational amplifier, makes of an ideal current limiter for

output low side current sensing.

The AP4320 is available in SOT26 package.

Features



Constant Voltage and Constant Current Control



Low External Component Count



Easy Compensation



Low Supply Current: 190

A



Precision Internal Voltage Reference: 2.5V



Operating Supply Voltage: 3.5V to 36V



Low Current Sense Threshold: 30mV/50mV



Totally Lead-free & Fully RoHS Compliant (Note 1 & 2)



Halogen and Antimony Free.

“Green” Device (Note 3)

Pin Assignments

(Top View)

1

2

3

4

5

Pin 1 Mark

6

GND

SOT26 (K6 Package)

Applications



AC/DC Adapters



Battery Chargers



LED Drivers

Notes:

1. No purposely added lead. Fully EU Directive 2002/95/EC (RoHS) & 2011/65/EU (RoHS 2) compliant.

2. See http://www.diodes.com/quality/lead_free.html

for more information about Diodes Incorporated’s definitions of Halogen- and Antimony-free, "Green"

and Lead-free.

3. Halogen- and Antimony-

free "Green” products are defined as those which contain <900ppm bromine, <900ppm chlorine (<1500ppm total Br + Cl) and

<1000ppm antimony compounds.

Typical Applications Circuit

V

CC

V

OUT

GND

V

SENSE

I

CTRL

R

SS

R4

To

primary

R 2

R1

V

V

Load

C1

R3

C3

R5

R6

V

CTRL

AP4320

+

+

I

L

2.5V

C2

(Optional)

OP1

OP2

1

2

3

4

5

6

Typical Application 1

1

2

1

R

R

R

V

V

REF

OUT







SS

SENSE

R

V

it

CurrentLim 