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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
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Preliminary Datasheet
Off-line Primary Side Regulation Controller for Dimmable LED Driver AP1681
Functional Block Diagram
VCC
8
FB_OVP 8V
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
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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.
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Preliminary Datasheet
Off-line Primary Side Regulation Controller for Dimmable LED Driver AP1681
Absolute Maximum Ratings (Note 1)
Parameter Symbol Value Unit
Power Supply Voltage
Driver Output Current I
Voltage at RD, RI, DIM, CS
FB Input Voltage
Operating Junction Temperature TJ 150 ºC
Storage Temperature T
Lead Temperature (Soldering, 10 sec) T
Power Dissipation at TA=50° C
Thermal Resistance
(Junction-to-Ambient)
ESD (Machine Model) 200 V
ESD (Human Body Model) 4000 V
V
CC
±300 mA
OUT
V
, VRI,
RD
V
, VCS
DIM
V
FB
-65 to 150 ºC
STG
300 ºC
LEAD
0.65 W
P
D
θ
JA
-0.3 to 30 V
-0.3 to 7 V
-40 to 10 V
150
° C/W
Note 1: 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
Parameter Symbol Min Max Unit
Power Supply Voltage
Ambient Temperature TA -40 105 ºC
10.8 21.5 V
V
CC
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Preliminary Datasheet
Off-line Primary Side Regulation Controller for Dimmable LED Driver AP1681
Electrical Characteristics
V
=15V, TA=25°C, unless otherwise specified.
CC
Parameter Symbol Conditions Min Typ Max Unit
UVLO Section
Start-up Threshold VTH (ST) 16.5 19 21.5
Minimal Operating Voltage V
(Min) After turn on 7.2 9 10.8
OPR
Standby Curr ent Section
Start-up Current IST
V
Before start up
CC=VTH
(ST)-0.5V,
1.7 10
Operating Current ICC Static 700 900 1100
V
µ A
Drive Output Section
=12V
=20mA
=12V
=20V
=0 to V
=10mA
=20mA
=5mA
CC–ON
8 V
1 V
11 13 15 V
1 V
µ s
I
Output High Level Voltage VOH
Output Low Level Voltage VOL
Output Voltage Rise Time tR C
Output Voltage Fall Time tF C
Output Clamp Vo ltage V
UVLO Saturation Voltage V
Maximum Switch On-time t
O-CLAMP
UVLO
ONP_MAX
GD-SOURCE
V
CC
I
GD-SINK
V
CC
=1nF 120 220 320 ns
L
=1nF 30 50 90 ns
L
I
GD-SOURCE
V
CC
V
I
SINK
CC
16.5
DIM Input Section
Voltage Gain to RI
∆ V
RI
/∆ V
DIM
Internal Source Current 11 20 35
-1.2 -1.1 -1.0
µ A
Reload Threshold 0.8 1 1.25 V
RD and RI Section
RD Pin Voltage VRD 1.3 1.5 1.75 V
Maximum RD Current
150
µ A
Maximum RI Current
250
µ A
Current Sense Section
Current Sense Voltage VCS 450 500 560 mV
Maximum CS Current V
=0 120
DIM
µ A
Leading Edge Blanking 600 ns
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Preliminary Datasheet
Off-line Primary Side Regulation Controller for Dimmable LED Driver AP1681
Electrical Characteristics (Continued)
V
=15V, TA=25°C, unless otherwise specified.
CC
Parameter Symbol Conditions Min Typ Max Unit
Feedback Input Section
CV Feedback Threshold V
FB Pin Input Leakage
Current
Acceleration Start
Threshold
Over Voltage Protection V
3.0 4.0 5.0 V
FB-CV
V
I
FB
=4V 1.0 2 3.0
FB
µ A
1.35 1.75 2.15 V
6.5 8 9.5 V
FB-OVP
Over Temperatur e Protection Section
Shutdown Temperature 140
Temperature Hysteresis 20
o
C
o
C
Typical Performance Characteristics
19.0
18.8
18.6
18.4
Start-up Voltage (V)
18.2
18.0
-40 -20 0 20 40 60 80 100 120
Ambient Temperature (oC)
Figure 4. Start-up Voltage vs. Ambient Temperature Figure 5. Minimal Operating Voltage vs.
10.0
9.5
9.0
Minimal Operating Voltage (V)
8.5
-40 -20 0 20 40 60 80 100 120
Ambient Temperature (oC)
Ambient Temperature
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Preliminary Datasheet
Off-line Primary Side Regulation Controller for Dimmable LED Driver AP1681
Typical Performance Characteristics (Continued)
2.2
2.0
1.8
Start-up Current (µ A)
1.6
940
920
900
880
860
840
Operating Current (µ A)
820
1.4
-40 -20 0 20 40 60 80 100 120
Ambient Temperature (oC)
800
-40 -20 0 20 40 60 80 100 120
Ambient Temperature (oC)
Figure 6. Start-up Current vs. Ambient Temperature
Figure 7. Operating Current vs. Ambient Temperature
1000
900
800
700
600
500
400
300
Operating Current (µ A)
200
100
0
0 5 10 15 20 25 30
Supply Voltage (V)
Figure 8. Operating Current vs. Supply Voltage Figure 9. Current Sense Voltage vs. Supply Voltage
540
520
500
480
Current Sense Voltage (mV)
460
20 22 24 26 28 30
Supply Voltage (V)
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Preliminary Datasheet
Off-line Primary Side Regulation Controller for Dimmable LED Driver AP1681
Typical Performance Characteristics (Continued)
530
520
510
500
490
Current Sense Voltage (mV)
480
470
-40 -20 0 20 40 60 80 100 120
Ambient Temperature (oC)
Figure 10. Current Sense Voltage vs.
Ambient Temperature Ambient Temperature
4.3
4.2
4.1
4.0
3.9
3.8
CV Feedback Threshold (V)
3.7
3.6
20 22 24 26 28 30
Figure 12. CV Feedback Threshold vs. Figure 13. Over Voltage Protection vs.
Supply Voltage
Supply Voltage (V)
4.4
4.3
4.2
4.1
4.0
CV Feedback Threshold (V)
3.9
3.8
- 4 0- 2 00 2 04 06 08 01 0 01 2 0
Ambient Temperature (oC)
Figure 11. CV Feedback Threshold vs.
9.0
8.9
8.8
8.7
8.6
8.5
8.4
8.3
Over Voltage Protection (V)
8.2
8.1
8.0
-40 -20 0 20 40 60 80 100 120
Ambient Temperature (oC)
Ambient Temperature
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Preliminary Datasheet
Off-line Primary Side Regulation Controller for Dimmable LED Driver AP1681
Typical Performance Characteristics (Continued)
3.0
15
2.5
2.0
1.5
FB Input Leakage Current (µ A)
1.0
-40 -20 0 20 40 60 80 100 120
Ambient Temperature (oC)
Figure 14. FB Input Leakage Current vs. Figure 15. Output Clamp Voltage vs.
Ambient Temperature Supply Voltage
14
13
12
Output Clamp Voltage (V)
11
10
20 22 24 26 28 30
Supply Voltage (V)
1.70
1.65
1.60
1.55
RD Pin Voltage (V)
1.50
1.45
- 4 0- 2 00 2 04 06 08 01 0 01 2 0
Ambient Temperature (oC)
Figure 16. RD Pin Voltage vs. Ambient Temperature
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Preliminary Datasheet
Off-line Primary Side Regulation Controller for Dimmable LED Driver AP1681
Typical Application
COMP
EE16
L=1.43mH
47k
ZCD
GD
CS
INV
AP1661
115T
11T
47
3N60
V
BUS
+
100pF
2R
630V
6.8 F
350V
120Vac
60Hz
Dimmer
EE16
L=4.5mH
47nF
~
~
1A/600V
V
REC
+
22nF
470k
560k
3.3k
1nF
GND
MULT
VCC
560k
AP1681 LED Application:
Dimmable LED Driver
Input: 120Vac/60Hz
18W Power
Output: 8 LEDs, 26V
5.0mA to 550mA
32 V
OPEN
LOAD
680k
220k
270k
1
F
330k 330k
100k
16k
0.47
0.47
F
0.47
F
VCC
DIM
F
RD
51k 100k
BAV20
BAV20
RI
47k
FB
OUT
CS
GND
330nF
14T
=0.3
φ
10k
AP1681
16k
2.2nF
630V
Figure 17. Typical Application of AP1681
100
3.0k
680k
68k
680k
0.16
FR105
95T
×3
SR
3A/150V
19T
=0.4
φ
TIW
EF20
L=2.54mH
4N60
1.3R
220
F
35V
+
Y2
1.5nF 3kV
27k
V
OUT
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Preliminary Datasheet
Off-line Primary Side Regulation Controller for Dimmable LED Driver AP1681
Mechanical Dimensions
SOIC-8 Unit: mm(inch)
R0.150(0.006)
Jul. 2011 Rev. 1. 2 BCD Semiconductor Manufacturing Limited
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BCD Semiconductor Manufacturing Limited
IMPOR T ANT NOTICE
IMPORTANT NOTICE
BC D Semiconductor Manufactu ring Limited reserves the r i ght to make changes without further not ice to any pr oducts or specifi-
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cations h e rein. BCD Semiconductor Manuf acturin g Limited does not as sume any responsibility fo r us e of any its products for any
cations herein. BCD Semiconductor Manufacturing Limited does not assume any responsibility for use of any its products for any
particular purp ose, nor do es BCD Semiconductor Man ufacturi ng Limited assume any liability ar is ing out of the application or use
particular purpose, nor does BCD Semiconductor Manufacturing Limited assume any liability arising out of the application or use
of any its pro ducts or circui ts. BCD Semiconductor Manufactu ring Limited does not con v ey any license un der its patent rights or
of any its products or circuits. BCD Semiconductor Manufacturing Limited does not convey any license under its patent rights or
other rights no r the rights of others.
other rights nor the rights of others.
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