A Product Line of
Diodes Incorporated
AP1688
AC/DC, HIGH PF, HIGH EFFICIENCY, UNIVERSAL MAINS LED DRIVER CONTROLLER
Description Features
The AP1688 is a high performance AC/DC PFC and constant current
Optimized for Buck Topology
controller for universal mains LED driver applications. The device is a
Boundary Conduction Mode (BCM) Operation to Achieve High
buck controller which operates as a boundary conduction mode
Efficiency
(BCM) to achieve high efficiency and easy EMI.
High Power Factor > 0.9
High Efficiency > 90%
An open loop algorithm is adopted in the AP1688, which will make the
System Current Accuracy: 5%
system achieve excellent line and load regulations with high PF for
Good Line Regulation and Load Regulation
universal mains input.
Low Start-up Current
Tight CC Regulation Performance for Universal Input Mains
The AP1688 features fast start-up, low start-up current, low operation
Voltage Range
current and high efficiency. It also has rich protection features
including over voltage, short and open circuit, over current, over Eliminates Control Loop Compensation Circuitry
temperature protection.
Easy EMI
Open-load and Reload Detection
The AP1688 is available in SO-8 package.
Over Temperature Protection
Over Current Protection
Over Voltage and Short and Open Circuit Protection
Pin Assignments
Totally Lead-Free & Fully RoHS Compliant (Notes 1 & 2)
Halogen and Antimony Free. Green Device (Note 3)
(Top View)
8 VCC
NC 1
Applications
2 7 OUT
VS
Universal Mains LED lighting
VA 3 6 GND
5 FB
CS 4
(SO-8/ M Package)
Notes: 1. No purposely added lead. Fully EU Directive 2002/95/EC (RoHS) & 2011/65/EU (RoHS 2) compliant.
2. See
A Product Line of
Diodes Incorporated
AP1688
Pin Descriptions
Pin Number Pin Name Function
1 NC No connection
2 VS Detects the negative terminal voltage of output.
Detects the average value of the negative terminal voltage of output.
3 VA
Primary current sensing
4 CS
The feedback voltage sensing from the auxiliary winding
5 FB
Ground
6 GND
Gate driver output
7 OUT
Supply voltage of gate driver and control circuits of the IC
8 VCC
Functional Block Diagram
VCC
8
UVLO pro
Regulator
5
OVP
UVLO
& Bias
FB
0.1V
-
ZCD
ZCD
COMP
Detector
+
7
+
R
CV_CTRL
EA OUT
Q Driver
1.75V -
S
4
Peak Current Control &
CS
LEB
Input Current
2 RQ
Shaping and
VS
Constant
6
Current Control GND
S
3
VA
2 of 10 February 2015
AP1688
Diodes Incorporated
www.diodes.com
Document number: DS36603 Rev. 2 - 2
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