Diodes AP4320 User Manual
Description, Features, Pin assignments
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
V
SENSE
GND
V
CTRL
I
CTRL
V
OUT
V
CC
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
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
Typical Application 1
1
2
1
R
R
R
V
V
REF
OUT
SS
SENSE
R
V
it
CurrentLim