Diodes AP4320 User Manual

AP4320

Document number: DS36786 Rev. 2 - 2

1 of 11

www.diodes.com

December 2013

AP4320

A Product Line of

Diodes Incorporated

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

V

SENSE

GND

V

CTRL

I

CTRL

V

OUT

V

CC

SOT26 (K6 Package)

Applications

 AC/DC Adapters  Battery Chargers  LED Drivers

V

CC

V

OUT

GND

V

SENSE

I

CTRL

R

SS

R4

To

primary

R2

R1

V

OUT

+

V

OUT

-

Load

C1

R3

C3

R5

R6

V

CTRL

AP4320

+

I

L

2.5V

C2

(Optional)

OP1

OP2

1

2

3

4

5

6

121R

RR

VV

REFOUT





SS

SENSE

R

V

itCurrentLim 

CONSTANT VOLTAGE AND CONSTANT CURRENT CONTROLLER

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

Typical Application 1

AP4320

Document number: DS36786 Rev. 2 - 2

2 of 11

www.diodes.com

December 2013

AP4320

A Product Line of

Diodes Incorporated

V

CC

V

OUT

GND

V

SENSE

I

CTRL

R

SS

R4

To

primary

R2

R1

V

OUT

+

V

OUT

-

Load

C1

R3

C3

R5

R6

V

CTRL

AP4320

+

I

L

2.5V

C2

(Optional)

OP1

OP2

1

2

3

4

5

6

)(

1

21

)]([

SSLSSLREF

UT

O

RI

R

RR

RIVV 





SS

SENSE

R

V

itCurrentLim 

V

CC

V

OUT

GND

V

SENSE

I

CTRL

R

SS

R4

To

primary

R2

R1

V

OUT

+

V

OUT

-

Load

C1

R3

C3

R5

R6

V

CTRL

AP4320

+

I

L

2.5V

C2

(Optional)

OP2

OP1

1

2

3

4

5

6

)(

1

21

SSLREFOUT

RI

R

RR

VV 





 

SSREFSENSE

REFSENSE

RVV

VV

itCurrentLim







Typical Applications Circuit (Cont.)

Typical Application 2

Typical Application 3

AP4320

Document number: DS36786 Rev. 2 - 2

3 of 11

www.diodes.com

December 2013

AP4320

A Product Line of

Diodes Incorporated

Pin Number

Pin Name

Function

1

V

SENSE

Input pin of the current control loop

2

GND

Ground

3

V

CTRL

Input pin of the voltage control loop

4

I

CTRL

Input pin of the current control loop

5

V

OUT

Output pin. Sinking current only

6

VCC

Power Supply

4

1

2

3

6

V

CC

V

OUT

V

CTRL

5

GND

V

SENSE

I

CTRL

2.5V

OP1

OP2

Pin Descriptions

Functional Block Diagram

AP4320

Document number: DS36786 Rev. 2 - 2

4 of 11

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December 2013

AP4320

A Product Line of

Diodes Incorporated

Symbol

Parameter

Rating

Unit

VCC

Power Supply Voltage

-0.3 to 38

V

OUT

Input Voltage (V

OUT

Pin)

-0.3 to VCC

V

ICTRL

Input Voltage (I

CTRL

Pin)

-0.3 to 18

V

SENSE

Input Voltage (V

SENSE

Pin)

-0.3 to 18

V

VCTRL

Input Voltage (V

CTRL

Pin)

-0.3 to 18

V

TJ

Junction Temperature

+150

C

T

STG

Storage Temperature

-55 to +150

C

T

LEAD

Lead Temperature (Soldering, 5sec)

+260

C

θ

JA

Thermal Resistance (Junction to Ambient)

250

C/W

Symbol

Parameter

Min

Max

Unit

VCC

Power Supply Voltage

3.5

36

V

Absolute Maximum Ratings (Note 4)

Note 4: Stresses greater than those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and

functional operation of the device at these or any other conditions beyond those indicated under “Recommended Operating Conditions” is not implied. Exposure to “Absolute Maximum Ratings” for extended periods may affect device reliability.

Recommended Operating Conditions