TS19702_A12

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
Application
●
High Power Factor by One Cycle Control
●
E27, T5, T8 LED lighting
●
Accuracy Constant Current
●
LED Lighting Applications
●
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: 80VAC ~ 308VAC
Ordering Information
Part No.
Package
Packing
TS19702CX6 RFG
SOT-26
3kpcs / 7” Reel
Note: “G” denote for Halogen Free Product
Absolute Maximum Ratings (Ta = 25oC unless otherwise noted)
Parameter
Symbol
Limit
Unit
VCC
30
V
VCOMP
-0.3 ~ 7
V
Dimming Pin
VDIM
-0.3 ~ 7
V
Current Sense Pin
VCS
-0.3 ~ 7
V
Output Pin
VOUT
15
V
PD
250
mW
TOPR
-20 ~ +85
o
C
+150
o
C
-65 ~ +150
o
C
Supply Voltage
Compensation Voltage
Power Dissipation @ TA=85ºC
Operating Ambient Temperature
Junction Temperature
TJ
Storage Temperature Range
TSTG
Thermal Resistance - Junction to Ambient
ESD Voltage Protection
1/9
o
RӨJA
250
C/W
HBM
2
KV
MM
200
V
Version: A12
TS19702
High Power Factor Corrector LED Driver
Electrical Characteristics (VCC=15 , TA=25℃, unless otherwise specified.)
Parameter
Symbol
Min.
Typ.
Max.
Unit
ISTART
--
8
15
µA
Operating Current (with 1nF load on OUT pin),
Vcomp = 2.5V
IOPR
--
2
3
mA
Operating Current (with 1nF load on OUT pin),
Protection Tripped (OCP, OVP, SCP, OTP)
IOPR
--
0.7
1
mA
UVLO(off)
UVLOOFF
7
8
9
V
UVLO(on)
Supply Voltage
Startup Current (VCC=UVLO on - 1V)
UVLOON
14
15
16
V
OVP Level on VCC Pin
VOVP
26.5
28
29.5
V
OVP De-Bounce Time
TOVP
--
40
--
µs
VFB
0.196
--
0.200
V
120
0.204
--
µs
ISINK
--
12
--
µA
ISOURCE
--
12
--
µA
VIN-PROTECT
0.80
V
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
VCS
0.7
--
5
0.9
--
Leading-Edge Blanking Time
TLE
--
410
--
ns
TO-DELAY
--
100
220
ns
FSW
42
90
--
45
--
48
--
KHz
D(MAX)
--
%
6
%
VSTB
---
+/-4
---
1
%
TRISING
--
160
320
ns
TFALLING
80
160
ns
13.5
15
V
Delay to Output
V
Switching Frequency
Switching Frequency
Maximum Duty
Frequency Jitter Range
Temp. Stability (-40°C ~ 125°C)
TEMPSTB
Voltage Stability (VCC = 11V~25V)
GATE DRIVER OUTPUT
Rising Time, Load Capacitance =1000pF
%
VGATE-Clamp (VCC=25V)
VGATE
---
DIM INPUT SECTION
Saturation Threshold Voltage
SATTH
3.0
--
--
V
DIM
0.3
--
3.0
V
IOFFTH
--
--
0.3
V
CS
290
300
310
µA
OTPTP
140
150
160
o
140
o
o
Falling Time, Load Capacitance =1000pF
Linear Dimming Range
LED Current off Threshold Voltage
Current Source
OTP SECTION
OTP Trip Point
OTP Release Point
OTPRP
120
130
OTP Threshold Level
OTPTH
--
20
--
OTP De-Bounce Time
OTPDBT
40
80
120
C
C
C
µs
Note 1: OCP, SCP, OTP: Auto Recovery Type
Note 2: OVP, Auto Recovery Type (Latch off type optional)
2/9
Version: A12
TS19702
High Power Factor Corrector LED Driver
Function Block
Pin Description
Pin No.
Name
Function
1
VCC
Power supply pin
2
GND
Ground pin
3
OUT
The output driver for driving the external MOSFET
4
DIM
Dimming control pin by input a DC voltage
5
COMP
6
CS
Feedback compensation network
Current sense pin, connect to sense the MOSFET current
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 VCC 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 VCC 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
VCC 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
TS19702
High Power Factor Corrector LED Driver
Electrical Characteristics Curve
Figure 1. Star-Up current vs. Temperature
Figure 2. Operating Current vs. Temperature
Figure 3. UVLO-OFF vs. Temperature
Figure 4. UVLO-ON vs. Temperature
Figure 5. FB VREF vs. Temperature
Figure 6. Output Sink Current vs. Temperature
6/9
Version: A12
TS19702
High Power Factor Corrector LED Driver
Electrical Characteristics Curve
Figure 7. Output Source Current vs. Temp.
Figure 8. Input Over Voltage vs. Temperature
Figure 9. Open Loop Voltage vs. Temperature
Figure 10. Switching Frequency vs. Temp.
7/9
Version: A12
TS19702
High Power Factor Corrector LED Driver
SOT-26 Mechanical Drawing
Unit: Millimeters
Marking Diagram
RF
Y
M
L
= Device Code
= Year Code (2=2012, 3=2013, 4=2014…..)
= Month Code for Halogen Free Product
(O=Jan, P=Feb, Q=Mar, R=Apl, S=May, T=Jun, U=Jul, V=Aug, W=Sep,
X=Oct, Y=Nov, Z=Dec)
= Lot Code
8/9
Version: A12
TS19702
High Power Factor Corrector LED Driver
Notice
Specifications of the products displayed herein are subject to change without notice. TSC or anyone on its behalf,
assumes no responsibility or liability for any errors or inaccuracies.
Information contained herein is intended to provide a product description only. No license, express or implied, to
any intellectual property rights is granted by this document. Except as provided in TSC’s terms and conditions of
sale for such products, TSC assumes no liability whatsoever, and disclaims any express or implied warranty,
relating to sale and/or use of TSC products including liability or warranties relating to fitness for a particular purpose,
merchantability, or infringement of any patent, copyright, or other intellectual property right.
The products shown herein are not designed for use in medical, life-saving, or life-sustaining applications.
Customers using or selling these products for use in such applications do so at their own risk and agree to fully
indemnify TSC for any damages resulting from such improper use or sale.
9/9
Version: A12