Diodes AP1686 User Manual
Low-Power Off-line PSR LED Controller AP1686
Preliminary Datasheet
General Description
The AP1686 is a high performance AC/DC power
supply controller for LED lighting application. The
device uses Pulse Frequency Modulation (PFM)
method to build discontinuous conduction mode
(DCM) flyback power supplies.
The AP1686 provides accurate constant voltage,
constant current (CV/CC) regulation without
requiring an opto-coupler and the secondary control
circuitry. It also eliminates the need of loop
compensation circuitry while maintaining good
stability. The AP1686 can achieve excellent
regulation and high average efficiency, yet meets
no-load consumption less than 30mW.
It also has an adjustable built-in line compensation
function to achieve tight CC.
The AP1686 is available in SOT-23-6 package.
Features
• Primary Side Control for Tight Constant Current
and Constant Voltage
• 30mW No-load Input Power
• Bipolar Junction Transistor (BJT) Driving
• Open Circuit Protection
• Over Voltage Protection
• Short Circuit Protection
• SOT-23-6 Package
Applications
• LED Driver
Figure 1. Package Type of AP1686
SOT-23-6
Nov. 2012 Rev. 1.1 BCD Semiconductor Manufacturing Limited
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Preliminary Datasheet
Low-Power Off-line PSR LED Controller AP1686
Pin Configuration
K6 Package
(SOT-23-6)
Pin 1 Mark
1
2
34
6
5
Figure 2. Pin Configuration of AP1686 (Top View)
Pin Description
Pin Number Pin Name Function
The OUT pin is used to turn on and turn off the power switch. When
turning on the power switch, the OUT pin will output 30mA source
1 OUT
2, 5 GND
3 VCC
4 CS
6 FB
current to support the base current of the power BJT. When turning
off the power switch, the resistance between the OUT and GND will
become to 5Ω
The GND pin is the ground of the IC. When the power BJT is turned
off, a fast reverse sinking current to the gate of BJT will flow out
from this pin. Attention should be paid to in the PCB layout
The VCC pin supplies the power for the IC. In order to get the
correct operation of the IC, a capacitor with low ESR should be
placed as close as possible to the VCC pin
The CS is the current sense pin of the IC. The IC will turn off the
power BJT according to the voltage on the CS pin. When the power
BJT is on, a current is output from the CS pin which is proportional
to the line voltage to realize the function of line compensation
The CV and CC regulation are realized based on the voltage
sampling of this pin
Nov. 2012 Rev. 1.1 BCD Semiconductor Manufacturing Limited
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Preliminary Datasheet
Low-Power Off-line PSR LED Controller AP1686
Functional Block Diagram
VCC
3
FB
UVLO
6
0.1V
COMP
PFM
OVP
&
OCKP
Tonsec
Detector
PRO
T
ONS
Regulator
&
Bias
UVLO
CS
V
FB
Line
Compensation
4
T
ONS
Constant Voltage
EA
V
REF1
V
REF2
Constant Current
Control
Control
Peak Current
Control & LEB
Q
R
S
Shutdown
Pre_Shutdown
Q
R
S
Pro
CV_
CC_
CC_ctrl
ctrl
ctrl
PFM
Driver
2,5
1
OUT
GND
Figure 3. Functional Block Diagram of AP1686
Nov. 2012 Rev. 1.1 BCD Semiconductor Manufacturing Limited
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Preliminary Datasheet
Low-Power Off-line PSR LED Controller AP1686
Ordering Information
AP1686 -
Circuit Type
G1: Green
Package
K6: SOT-23-6
TR: Tape & Reel
Package
SOT-23-6
BCD Semiconductor's Pb-free products, as designated with "G1" suffix in the part number, are RoHS compliant
and green.
Temperature
Range
-40 to 85°C
Part Number Marking ID Packing Type
AP1686K6TR-G1 GBQ Tape & Reel
Absolute Maximum Ratings (Note 1)
Parameter Symbol Value Unit
Supply Voltage VCC -0.3 to 30 V
CS to GND Voltage -0.3 to 7 V
FB Input Voltage VFB -40 to 7.5 V
Source Current at OUT Pin I
Operating Junction Temperature TJ 150 ºC
Storage Temperature T
Lead Temperature (Soldering, 10
sec)
Thermal Resistance (Junction to
Ambient)
ESD (Human Body Model) 2000 V
Internally Limited A
SOURCE
-65 to 150 ºC
STG
T
300 ºC
LEAD
θ
JA
200 ºC/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.
Nov. 2012 Rev. 1.1 BCD Semiconductor Manufacturing Limited
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