TS19702
High Power Factor Corrector LED Driver
SOT-26
Pin Definition:
1. VCC
2. Ground
3. Output
4. Dimming
5. Compensation
6. Current Sense
Description
The TS19702 is a highly-integrated, low startup current, average current mode, one cycle control PFC and fixed
switching frequency PWM controller. These functions enable the LED driver to easily meet the accuracy
average LED current and high power factor requirements. The integrated functions also include the LED short
protection, open protection, and internal over temperature protection. The COMP pin controls the duty by
connected an RC compensation network to ground and forming the closed loop feedback control. To protect the
external power MOSFET from being damaged by supply over voltage, the TS19702 Output pin voltage is
clamped to about 15V.
Features
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●
●
●
●
●
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●
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High Power Factor by One Cycle Control
Accuracy Constant Current
Low BOM Cost
Linear Dimming on DIM Pin
Average Current / Fixed Frequency Control
Gate Output Voltage Clamp
LED Open Protection (OVP)
LED Short Protection (SCP)
Over Current Protection (OCP)
Internal OTP Protection
300mA Driving Capability for Output Pin
Application voltage range: 80V
AC
~ 308V
AC
Application
●
●
E27, T5, T8 LED lighting
LED Lighting Applications
Ordering Information
Part No.
TS19702CX6 RFG
Package
SOT-26
Packing
3kpcs / 7” Reel
Note:
“G” denote for Halogen Free Product
Absolute Maximum Ratings
(Ta = 25
o
C unless otherwise noted)
Parameter
Supply Voltage
Compensation Voltage
Dimming Pin
Current Sense Pin
Output Pin
Power Dissipation @ T
A
=85ºC
Operating Ambient Temperature
Junction Temperature
Storage Temperature Range
Thermal Resistance - Junction to Ambient
ESD Voltage Protection
Symbol
V
CC
V
COMP
V
DIM
V
CS
V
OUT
P
D
T
OPR
T
J
T
STG
RӨ
JA
HBM
MM
Limit
30
-0.3 ~ 7
-0.3 ~ 7
-0.3 ~ 7
15
250
-20 ~ +85
+150
-65 ~ +150
250
2
200
Unit
V
V
V
V
V
mW
o
o
o
o
C
C
C
C/W
KV
V
1/9
Version: A12
TS19702
High Power Factor Corrector LED Driver
Electrical Characteristics
(V
CC
=15 , T
A
=25℃, unless otherwise specified.)
Parameter
Supply Voltage
Startup Current (V
CC
=UVLO on - 1V)
Operating Current (with 1nF load on OUT pin),
Vcomp = 2.5V
Operating Current (with 1nF load on OUT pin),
Protection Tripped (OCP, OVP, SCP, OTP)
UVLO(off)
UVLO(on)
OVP Level on V
CC
Pin
OVP De-Bounce Time
Voltage Feedback
Feedback Reference Voltage
Tran-Conductance
Output Sink Current
Output Source Current
Current Sensing
Input Over Voltage Protection
Open Loop Voltage, CS Pin Open
Leading-Edge Blanking Time
Delay to Output
Switching Frequency
Switching Frequency
Maximum Duty
Frequency Jitter Range
Temp. Stability (-40°C ~ 125°C)
Voltage Stability (VCC = 11V~25V)
GATE DRIVER OUTPUT
Rising Time, Load Capacitance =1000pF
Falling Time, Load Capacitance =1000pF
VGATE-Clamp (VCC=25V)
DIM INPUT SECTION
Saturation Threshold Voltage
Linear Dimming Range
LED Current off Threshold Voltage
Current Source
OTP SECTION
OTP Trip Point
OTP Release Point
OTP Threshold Level
OTP De-Bounce Time
Note 1:
OCP, SCP, OTP: Auto Recovery Type
Note 2:
OVP, Auto Recovery Type (Latch off type optional)
OTP
TP
OTP
RP
OTP
TH
OTP
DBT
140
120
--
40
150
130
20
80
160
140
--
120
o
o
Symbol
I
START
I
OPR
I
OPR
UVLO
OFF
UVLO
ON
V
OVP
T
OVP
V
FB
I
SINK
I
SOURCE
V
IN-PROTECT
V
CS
T
LE
T
O-DELAY
F
SW
D
(MAX)
TEMP
STB
V
STB
T
RISING
T
FALLING
V
GATE
SAT
TH
DIM
IOFF
TH
CS
Min.
--
--
--
7
14
26.5
--
0.196
--
--
--
0.7
--
--
--
42
90
--
--
--
--
--
--
3.0
0.3
--
290
Typ.
8
2
0.7
8
15
28
40
0.200
120
12
12
0.80
5
410
100
45
--
+/-4
--
--
160
80
13.5
--
--
--
300
Max.
15
3
1
9
16
29.5
--
0.204
--
--
--
0.9
--
--
220
48
--
--
6
1
320
160
15
--
3.0
0.3
310
Unit
µA
mA
mA
V
V
V
µs
V
µs
µA
µA
V
V
ns
ns
KHz
%
%
%
%
ns
ns
V
V
V
V
µA
C
C
C
o
µs
2/9
Version: A12
TS19702
High Power Factor Corrector LED Driver
Function Block
Pin Description
Pin No.
1
2
3
4
5
6
Name
VCC
GND
OUT
DIM
COMP
CS
Power supply pin
Ground pin
The output driver for driving the external MOSFET
Dimming control pin by input a DC voltage
Feedback compensation network
Current sense pin, connect to sense the MOSFET current
Function
3/9
Version: A12
TS19702
High Power Factor Corrector LED Driver
Application Circuit
Application Information
Start-up Current
The typical start-up current is around 8µA. Very low start-up current allows the PWM controller to increase the
value of start-up resistor and then reduce the power dissipation on it.
UVLO (Under Voltage Lockout)
A hysteresis UVLO comparator is implemented in TS19702, then the turn-on and turn-off thresholds level are fixed
at 15V and 8V respectively. This hysteresis shown in Fig.11 ensures that the start-up capacitor will be adequate to
supply the chip during start-up. For quickly startup the LED driver, the start-up resistor should be matched with the
startup capacitor. Due to the low UVLO on level, so the turn-on delay time will also never greater than the general
PWM IC.
Oscillator
The maximum duty-cycle of internal oscillator is up to 90% for driving high LED voltage string. The frequency of the
oscillator is fixed to 45KHz by internal setting.
LEB (Leading-Edge Blanking)
Each time the power MOSFET is switched on, a turn-on spike will inevitably occur at the sense resistor. To avoid
fault trigger, a 410ns leading-edge blanking time is built in. Conventional RC filtering can therefore be omitted.
During this blanking period, the current-limit comparator is disabled and can not switch off the gate driver.
4/9
Version: A12
TS19702
High Power Factor Corrector LED Driver
Application Information (Continue)
OCP (Over Current Protection)
The TS19702 has an over current protection function on CS pin. An internal circuit detects the current level, when
the current is larger than a threshold level, the gate output will keep on low level. Then V
CC
decreases below UVLO
off level, the controller resets again.
OVP (Over Voltage Protection) on VCC
To prevent the LED driver from being damaged, the TS19702 is implemented an OVP function on VCC. When the
VCC voltage is higher than the OVP threshold voltage 28V, the output gate driver circuit will be shut down
immediately to stop the switching of power MOSFET. The V
CC
pin OVP function is an auto recovery type protection
(latch off type optional). If the OVP condition happens, the pulses will be stopped and never recovery unless the
V
CC
pin voltage is down to the UVLO off level. The TS19702 is working in an auto-recovery mode as shown in
below figure
Gate Clamp/Soft Driving
Driver is clamped to 15V by an internal clamping circuit. Those damages usually come from undesired over-voltage
gate signals. Under the conditions listed below, the gate output will turn off immediately to protect the power circuit.
The TS19702 also has soft driving function to minimize EMI.
Over Temperature Protection/Dimming Function
The typical application for DIM pin is shown in above Fig. The NTC thermistor is setting as an external OTP
protection. In the DIM pin, there is one comparator for latch-off mode protection. While the voltage on this pin is
lower than 0.3V, the TS19702 will shut down. When the voltage is in the range of 0.3 to 3.0V, the TS19702 is
operating on the linear dimming range. While the voltage is higher than 3.0V, the TS19702 is operating on the
normal status. It also could let this Pin open when the function is not required for the user.
5/9
Version: A12
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