BCDSEMI AP1686

Preliminary Datasheet
Low-Power Off-line PSR LED Controller
AP1686
General Description
Features
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.
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
It also has an adjustable built-in line compensation
function to achieve tight CC.
The AP1686 is available in SOT-23-6 package.
SOT-23-6
Figure 1. Package Type of AP1686
Nov. 2012
Rev. 1.1
BCD Semiconductor Manufacturing Limited
1
Preliminary Datasheet
Low-Power Off-line PSR LED Controller
AP1686
Pin Configuration
K6 Package
(SOT-23-6)
Pin 1 Mark
1
6
2
5
3
4
Figure 2. Pin Configuration of AP1686 (Top View)
Pin Description
Pin Number
Pin Name
1
OUT
2, 5
GND
3
VCC
4
CS
6
FB
Nov. 2012
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
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
Rev. 1.1
BCD Semiconductor Manufacturing Limited
2
Preliminary Datasheet
Low-Power Off-line PSR LED Controller
AP1686
Functional Block Diagram
VCC
3
UVLO
FB
OVP
&
OCKP
6
PRO
Regulator
&
Bias
UVLO
0.1V
COMP
Tonsec
Detector
PFM
TONS
Pro
VFB
Constant Voltage
Control
EA
PFM
R
Q
CV_ctrl
Driver
1
OUT
CC_ctrl
S
Line
Compensation
VREF1
Shutdown
Peak Current
Control & LEB
Pre_Shutdown
VREF2
CS
4
TONS
Constant Current
Control
R Q
CC_ctrl
2,5
GND
S
Figure 3. Functional Block Diagram of AP1686
Nov. 2012
Rev. 1.1
BCD Semiconductor Manufacturing Limited
3
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
Temperature
Range
SOT-23-6
-40 to 85°C
Part Number
AP1686K6TR-G1
Marking ID
GBQ
Packing Type
Tape & Reel
BCD Semiconductor's Pb-free products, as designated with "G1" suffix in the part number, are RoHS compliant
and green.
Absolute Maximum Ratings (Note 1)
Parameter
Supply Voltage
CS to GND Voltage
FB Input Voltage
Source Current at OUT Pin Operating Junction Temperature
Storage Temperature
Lead Temperature (Soldering, 10
sec)
Thermal Resistance (Junction to
Ambient)
ESD (Human Body Model)
Symbol
Value
Unit
VCC
ISOURCE TJ
TSTG
-0.3 to 30
-0.3 to 7
-40 to 7.5
Internally Limited 150
-65 to 150
V
V
V
A
ºC
ºC
TLEAD
300
ºC
θJA
200
ºC/W
2000
V
VFB
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
4
Preliminary Datasheet
Low-Power Off-line PSR LED Controller
AP1686
Electrical Characteristics
VCC =15V, TA=25°C, unless otherwise specified.
Parameter
Symbol
Conditions
UVLO SECTION
Startup Threshold
VTH (ST)
Minimal Operating Voltage
VOPR(MIN)
STANDBY CURRENT SECTION
Startup Current
IST
Operating Current
ICC(OPR)
DRIVE OUTPUT SECTION
Sink
ISINK
Output Current
Source
ISOURCE
CURRENT SENSE SECTION
Current Sense Threshold
VCS
Voltage
ΔVcs, eq
Equivalent Current Sense
Vcs, eq
Voltage Accuracy (Note 2)
Leading Edge Blanking
tLEB
FEEDBACK INPUT SECTION
Input Resistance of FB Pin
RFB
Feedback Threshold
VFB
LINE COMPENSATION SECTION
Line
Compensation
gm
Transconductance (Note 2)
PROTECTION SECTION
Over Voltage Protection
VFB(OVP)
Maximum On Time of
tonp
Primary Side
(MAX)
VCC=VTH (ST)-1V,
Before startup
Static current
Apply 1V @OUT pin
The minimum power
switch turn on time
VFB=4V
Min
Typ
Max
Unit
13
3
15.5
3.5
18
4.5
V
V
0
0.2
0.6
μA
250
400
600
200
24
300
30
500
45
mA
mA
440
500
550
mV
4
%
300
475
720
ns
1
3.7
1.6
3.974
2
4.21
MΩ
V
1.14
1.43
1.72
μS
6.5
7.5
8.5
V
11
18
50
μs
Note 2: The output current is given by I OUT = Vcs , eq × Np
Rcs
Ns
Nov. 2012
Rev. 1.1
BCD Semiconductor Manufacturing Limited
5
Preliminary Datasheet
Low-Power Off-line PSR LED Controller
AP1686
Typical Performance Characteristics
40
800
35
Source Current (mA)
Operating Current (μA)
700
600
500
400
300
30
25
200
100
10
15
20
25
20
10
30
15
Figure 4. Operating Current vs. Supply Voltage
25
30
Figure 5. Source Current vs. Supply Voltage
500
5.0
4.5
Operating Current (μA)
Minimal Operating Voltage (V)
20
Supply Voltage (V)
Supply Voltage (V)
4.0
3.5
3.0
450
400
350
2.5
2.0
-40
-20
0
20
40
60
80
100
120
300
-40
140
0
20
40
60
80
100
120
140
o
Ambient Temperature ( C)
o
Ambient Temperature ( C)
Figure 7. Operating Current vs.
Ambient Temperature
Figure 6. Minimal Operating Voltage vs.
Ambient Temperature
Nov. 2012
-20
Rev. 1.1
BCD Semiconductor Manufacturing Limited
6
Preliminary Datasheet
Low-Power Off-line PSR LED Controller
AP1686
3.0
18
2.5
17
Start-up Voltage (V)
Start-up Current (μA)
Typical Performance Characteristics (Continued)
2.0
1.5
1.0
16
15
14
0.5
0.0
-40
-20
0
20
40
60
80
100
120
13
-40
140
-20
0
o
20
40
60
80
100
120
140
o
Ambient Temperature ( C)
Ambient Temperature ( C)
Figure 8. Start-up Current vs. Ambient Temperature
Figure 9. Start-up Voltage vs. Ambient Temperature
50
2.00
1.75
Source Current (mA)
FB Input Resistance (MΩ)
45
1.50
40
35
30
25
20
1.25
15
1.00
-40
-20
0
20
40
60
80
100
120
10
-40
140
o
0
20
40
60
80
100
120
140
o
Ambient Temperature ( C)
Ambient Temperature ( C)
Figure 11. Source Current
vs. Ambient Temperature
Figure 10. FB Input Resistance
vs. Ambient Temperature
Nov. 2012
-20
Rev. 1.1
BCD Semiconductor Manufacturing Limited
7
Preliminary Datasheet
Low-Power Off-line PSR LED Controller
AP1686
Typical Performance Characteristics (Continued)
40
Primary Side Maximum On Time (μs)
Current Sense Voltage (mV)
600
550
500
450
400
350
30
20
10
0
-40
300
-40
-20
0
20
40
60
80
100
120
-20
0
20
40
60
80
100
120
140
140
o
Ambient Temperature ( C)
o
Ambient Temperature ( C)
Figure 13. Primary Side Maximum On Time
vs. Ambient Temperature
Figure 12. Current Sense Voltage vs.
Ambient Temperature
800
750
700
LEB (ns)
650
600
550
500
450
400
350
300
-40
-20
0
20
40
60
80
100
120
140
o
Ambient Temperature ( C)
Figure 14. LEB vs. Ambient Temperature
Nov. 2012
Rev. 1.1
BCD Semiconductor Manufacturing Limited
8
Preliminary Datasheet
Low-Power Off-line PSR LED Controller
AP1686
Typical Application
D2
T1
+
C1
R1
+
C2
VO+
+
D1
Np
Ns
C4
R10
VO-
R2
3
VCC
4
CS
1
OUT
Q1
Na
R6
AP1686
6
FB
GND
R7
2,5
RLINE
Rs
Figure 15. Typical LED Driver Application
Nov. 2012
Rev. 1.1
BCD Semiconductor Manufacturing Limited
9
Preliminary Datasheet
Low-Power Off-line PSR LED Controller
AP1686
Mechanical Dimensions
SOT-23-6
Unit: mm(inch)
0°
2.820(0.111)
8°
3.020(0.119)
0.300(0.012)
0.400(0.016)
5
4
2
3
0.300(0.012)
0.600(0.024)
1.500(0.059)
1.700(0.067)
2.650(0.104)
2.950(0.116)
6
0.200(0.008)
Pin 1 Mark
1
0.700(0.028)REF
0.950(0.037)TYP
0.000(0.000)
0.150(0.006)
1.800(0.071)
2.000(0.079)
0.100(0.004)
0.200(0.008)
0.900(0.035) 1.450(0.057)
MAX
1.300(0.051)
Nov. 2012
Rev. 1.1
BCD Semiconductor Manufacturing Limited
10
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