AP4320 Datasheet, PDF (1/11 Pages) Diodes Incorporated – CONSTANT VOLTAGE AND CONSTANT CURRENT CONTROLLER

A Product Line of
Diodes Incorporated
AP4320
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)
Pin 1 Mark
V_SENSE 1
GND 2
V_{CTRL 3}
6 VCC
5
V_OUT
4
I_CTRL
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
AP4320
6
2.5V
V_CC
OP1
V_OUT 5
+
V_CTRL 3
To
primary
R2
R4
R3
C1
+
OP2
C3
GND ²
R5
I_CTRL
V_SENSE
4
1
R1
C2
(Optional)
R6
R _SS
R1 R2
V_OUT  V_REF  _R1
Typical Application 1
CurrentLimit  ^VSENSE
R_SS
AP4320
Document number: DS36786 Rev. 2 - 2
1 of 11
www.diodes.com
V_OUT+
I_L
Load
V_OUT-
December 2013
© Diodes Incorporated