Diodes AP1681 User Manual
Off-line Primary Side Regulation Controller for Dimmable LED Driver AP1681
Preliminary Datasheet
General Description
The AP1681 is a powerful high performance AC/DC
power supply controller for dimmable LED lighting
applications. The device uses Pulse Frequency
Modulation (PFM) technology to regulate output
current according to the wall dimmer conduct angle.
The AP1681 achieves wide dimming range without
visible flicker and is compatible with diverse
dimmers.
The AP1681 features low start-up current, low
operation current and high efficiency. It also has rich
protection functions including over voltage, short
circuit, over current and over temperature protections.
The AP1681 is available in SOIC-8 package.
Features
• Primary Side Control for Output Current
Regulation Without Opto-coupler and Secondary
CV/CC Control Circuitry
• Adjustable Full Brightness and Full Dimming
Setting
• Wide Dimming Range From 100% to 1%, Down
to Full Darkness
• Adjustable Dimming Curve for Human Eye
Sensitivity
• No Visible Flicker
• Connectivity with Analog / Digital / Hybrid
Dimming Mode
• Built-in Acceleration Start
• Adjustable Soft-start Timing
• CV Open-load Regulation and Reload Detection
• Over Voltage an d Short Circuit Protection
• Over Temperature Protection
• Over Current Protection
• Maximum Switch On-time Protection
Applications
• Dimmable LED Driver Suit for Leading-edge
Dimmer, Trailing-edge Dimmer, R Type, R-C
Type or R-L Type Dimmer
SOIC-8
Figure 1. Package Type of AP1681
Jul. 2011 Rev. 1. 2 BCD Semiconductor Manufacturing Limited
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Preliminary Datasheet
Off-line Primary Side Regulation Controller for Dimmable LED Driver AP1681
Pin Configuration
M Package
(SOIC-8)
DIM
RD
8
1
2
VCC
7
OUT
RI
FB
3
4
GND
6
5
CS
Figure 2. Pin Configuration of AP1681 (Top View)
Pin Description
Pin Number Pin Name Function
1
2
3
4
DIM Dimming control signal input
RD Full brightness level setting
RI Full dimming level setting
FB The feedback voltage sensing from the auxiliary winding
5
6
7
8
CS Primary current sensing
GND Ground. Current return for gate driver and control circuits of the IC
OUT Gate driver output
VCC Supply voltage of gate driver and control circuits of the IC
Jul. 2011 Rev. 1. 2 BCD Semiconductor Manufacturing Limited
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Preliminary Datasheet
Off-line Primary Side Regulation Controller for Dimmable LED Driver AP1681
Functional Block Diagram
VCC
8
FB_OVP8V
COMP
FB
SHORT_OCP
1.75V
4
0.1V
4V
COMP
COMP
COMP
FB_ACC
Demag
CC_CTRL
CV_CTRL
VCC_OVP
FB_OVP
OTP
Tonsec
Detector
Protection
& Latch
Tons
CC_CTRL
pro
Constant
Current
Control
VCC_OVP
CC_ON
Regulator
&
Bias
Reference
UVLO
CS
DIM
5
COMP
4V
0.5V
1
COMP
SHORT_OCP
PEAK_CTRL
Dimming Control
23
RD
RI
CC_ON
R
Q
S
Q
S
R
Figure 3. Functional Block Diagram of AP1681
pro
CC_CTRL
pfm
Driver
6
7
OUT
GND
Jul. 2011 Rev. 1. 2 BCD Semiconductor Manufacturing Limited
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Preliminary Datasheet
Off-line Primary Side Regulation Controller for Dimmable LED Driver AP1681
Ordering Information
AP1681 -
Package
Circuit Type
Package
M: SOIC-8
Temperature
Range
Part Number Marking ID Packing Type
G1: Green
TR: Tape & Reel
Blank: Tube
SOIC-8
-40 to 105°C
AP1681M-G1 1681M-G1 Tube
AP1681MTR-G1 1681M-G1 Tape & Reel
BCD Semiconductor's Pb-free products, as designated with "G1" suffix in the part number, are RoHS compliant
and green.
Jul. 2011 Rev. 1. 2 BCD Semiconductor Manufacturing Limited
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