ETC TS19702

Preliminary
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
Ordering Information
Part No.
Package
Packing
TS19702CX6 RFG
SOT-26
3Kpcs / 7” Reel
Note: “G” denote for Halogen Free Product
Absolute Maximum Rating (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
+150
o
-65 ~ +150
o
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
C
C
C
o
RӨJA
250
C/W
HBM
2
KV
MM
200
V
Version: Preliminary
Preliminary
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
uA
IOPR
--
2
3
mA
IOPR
--
0.7
1
mA
UVLOOFF
UVLOON
VOVP
TOVP
7
14
26.5
--
8
15
28
40
9
16
29.5
--
V
V
V
us
VFB
0.196
----
0.200
120
12
12
0.204
----
V
uS
uA
uA
0.7
----
0.80
5
V
V
410
100
0.9
--220
45
--
48
--
+/-4
---
--
KHz
%
%
TEMP STB
VSTB
42
90
----
6
1
%
%
Rising Time, Load Capacitance =1000pF
Falling Time, Load Capacitance =1000pF
VGATE-Clamp (VCC=25V)
DIM INPUT SECTION
TRISING
TFALLING
VGATE
----
160
80
13.5
320
160
15
nS
nS
V
Saturation Threshold Voltage
Linear Dimming Range
LED Current off Threshold Voltage
Current Source
OTP SECTION
SATTH
DIM
IOFFTH
CS
3.0
0.3
-290
--300
-3.0
0.3
310
V
V
V
uA
OTP Trip Point
OTP Release Point
OTP Threshold Level
OTP De-Bounce Time
OTPTP
OTPRP
OTPTH
OTPDBT
140
120
-40
150
130
20
80
160
140
-120
o
Supply Voltage
Startup Current (VCC=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 VCC Pin
OVP De-Bounce Time
Voltage Feedback
Feedback Reference Voltage
Tran-Conductance
Output Sink Current
Output Source Current
Current Sensing
ISINK
ISOURCE
Input Over Voltage Protection
Open Loop Voltage, CS Pin Open
VIN-PROTECT
VCS
Leading-Edge Blanking Time
Delay to Output
Switching Frequency
TLE
TO-DELAY
Switching Frequency
Maximum Duty
Frequency Jitter Range
FSW
D(MAX)
Temp. Stability (-40°C ~ 125°C)
Voltage Stability (VCC = 11V~25V)
GATE DRIVER OUTPUT
--
nS
nS
C
C
o
C
uS
o
Note 1: OCP, SCP, OTP: Auto Recovery Type
Note 2: OVP, Auto Recovery Type (Latch off type optional)
2/9
Version: Preliminary
Preliminary
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: Preliminary
Preliminary
TS19702
High Power Factor Corrector LED Driver
Application Circuit
Application Information
Start-up Current
The typical start-up current is around 8uA. 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: Preliminary
Preliminary
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: Preliminary
Preliminary
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: Preliminary
Preliminary
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: Preliminary
Preliminary
TS19702
High Power Factor Corrector LED Driver
SOT-26 Mechanical Drawing
DIM
SOT-26 DIMENSION
MILLIMETERS
INCHES
MIN
MIN
TYP
MAX
TYP
A
0.95 BSC
A1
8/9
MAX
0.0374 BSC
1.9 BSC
0.0748 BSC
0.1102 0.1181
B
2.60
2.80
3.00
0.1024
C
1.40
1.50
1.70
0.0551
0.0591
0.0669
D
2.80
2.90
3.10
0.1101
0.1142
0.1220
E
1.00
1.10
1.20
0.0394
0.0433
0.0472
F
0.00
--
0.10
0.00
G
0.35
0.40
0.50
0.0138
0.0157
0.0039
0.0197
0.0059
0.0079
H
0.10
0.15
0.20
0.0039
I
0.30
--
0.60
0.0118
--
0.0236
J
5º
--
10º
5º
--
10º
Version: Preliminary
Preliminary
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: Preliminary
TS19702
APPLICATION NOTE
Designing with the TS19702
Single-Stage High Power Factor Corrector LED Driver
Description
TS19702 is special design for high power factor correct, accurate constant current and high performance single stage
LED Driver. It is suitable for universal input voltage range, simple circuit design, low BOM cost for LED Applications
The DIM pin provides linear dimming and over temperature by external control. The compensation control circuit only
needs a capacitor connected from COMP pin to GND pin. Constant output current can be set or adjust by a SENSOR
resistor.
Features
●
●
●
●
●
●
●
●
●
●
●
Accurate Constant Output Current Control for LED (<±3%)
PF >0.9 @ 264Vac/50Hz
High Efficiency >85% (Typ)
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
Low BOM Cost
Block Diagram
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1/8
Rev A
TS19702
APPLICATION NOTE
Designing with the TS19702
Single-Stage High Power Factor Corrector LED Driver
Function Description
VCC Pin – Start Up circuit & Under Voltage Lock Out
The TS19702 with very low start-up current reduces the power dissipation on the start-up resistor. A hysteresis UVLO
comparator is implemented in the TS19702, then the turn-on and turn-off thresholds level are fixed at 15V and 8V
respectively. This hysteresis ensures 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.
To prevent the LED driver from being damaged, the TS19702 is implemented an OVP function on the VCC pin. When
the VCC pin voltage is higher than the OVP threshold voltage 28V, the output of teh gate driver circuit will be shut
down immediately to stop the switching of the power MOSFET. The VCC pin OVP function is an auto recovery type
protection. 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 VCC pin voltage is supplied from the LED strings. For getting the correct bias voltage of VCC from the output,
there should choose a clamping zener diode and a ultrafast diode in series. A 600V ultrafast diode is recommended
when the input voltage is up to 264Vac. The zener diode is selected as shown in below formula:
Vz = VLED-18V
Out Pin Driver
The output driver is clamped to 13.5V by an internal clamping circuit. When VCC is higher than 13.5V, the internal
clamping circuit of OUT pin will never be higher than 13.5V. This function avoids the damage to MOSFET which
usually comes from the undesired over-voltage gate signals. The maximum duty-cycle of internal oscillator is around
90%, and the minimum duty-cycle time is around 410nS . The frequency of the oscillator is fixed on 45KHz.
Over Temperature Protection/Dimming Function
Put a NTC thermistor on DIM pin for setting the 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 0.25V, the MOSFET will be 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 3V, the TS19702 is operating on the normal status
COMP Pin Feedback Compensation Network
The design of compensation network is very important for the PFC controller. It affects the PF and stability
performance of the system. For keeping a constant value of Vcomp in one cycle of AC mains, the bandwidth should be
lower than around 1/10 mains frequency. The design of a compensation network could use a 1uF capacitor to
stabilize the feedback control loop.
CS Pin for LED Current Setting
The reference voltage of the error amplifier is 0.2V. So the ILED is setting as shown in below formula：
ILED = 0.2V/Sensor R
For getting more accurate output current and PF performance, the applicable range of VLED is
recommended as shown in below:
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Input Voltage
VLED
90V/60Hz~132V/60Hz
20V~60V
180V/50Hz~264V/50Hz
45V~100V
90V/60Hz~264V/50Hz
30V~60V
2/8
Rev A
TS19702
APPLICATION NOTE
Designing with the TS19702
Single-Stage High Power Factor Corrector LED Driver
Inductor Design
An example for detailing the design of inductor is shown as below
Step 1:
Po：Output Power
Vin min (ac)：Min. AC input voltage
η：Setting 0.85~0.9
PF：Setting 0.9~0.95
Step 2:
Step 3:
∆I=K*Iin pk
K：Setting 0.1~0.5
Step 4:
Step 5:
Step 6:
Step 7:
The current density of copper wire is selected between 400~500 cmil/A.
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Size (Diameter)
Current
0.2 mm
0.16 A
0.3 mm
0.36 A
0.4 mm
0.64 A
0.5 mm
1.00 A
0.6 mm
1.44 A
3/8
Rev A
TS19702
APPLICATION NOTE
Designing with the TS19702
Single-Stage High Power Factor Corrector LED Driver
Design Case
Photo Graph of Demo Board
TOP View
Bottom View
Basic Specification of Demo Board
Parameter
Specification
Output Power
10 W
Input Voltage
90~264 VAC
Output Voltage
50V
Output Current
200mA
PF
>0.9
Efficiency
>85%
LED Specification
Ambient
Temperature
1W/350mA 16pcs in series
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25℃
4/8
Rev A
TS19702
APPLICATION NOTE
Designing with the TS19702
Single-Stage High Power Factor Corrector LED Driver
Application Circuit
Bill of Material
No.
Reference
1
IC1
2
R3,R4
3
R5,R7
4
Package
Quantity
Manufacture
SOT-26
1
TSC
SMD 1206 330kΩ 5% 1/4W
1206
2
SMD 0805 10Ω 5% 1/8W
0805
2
R6
SMD 1206 1Ω 1% 1/4W
1206
1
5
C3
SMD 0805 1uF/25V 10% X7R
0805
1
6
BD1
Bridge Diode 0.8/600V RMB6S
MBS
1
TSC
7
D1
DO-201AD
1
TSC
8
DZ1
Sub SMA
1
TSC
9
D2
Super Fast Diode ES2J 2A/600V SMB
DO-214AA
1
TSC
10
C1
Capacitor-MPP 0.1uF/450V 105℃ 10%
11
C4
10uF 50V 5*11 E-CAP
5*11
1
12
C5
Capacitor-EC 1uF/400V
8*11.5
1
13
CX1
13*12*6mm
1
14
Q1
MOSFET TSM2NB60CH 2A/600V
TO-251
1
15
F1
FUSE 1.25A/250V
8.4*4*8.4mm
1
16
L1
CHOKE 3.3mH
DR10*20
1
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Part number
TS19702CX6
Super Fast Diode SF38G
Zener Diode 31V/0.8W BZD27C33P
Capacitor-X1 0.1uF/300V 20% 13x12x6
5/8
1
TSC
Rev A
TS19702
APPLICATION NOTE
Designing with the TS19702
Single-Stage High Power Factor Corrector LED Driver
Demo Board Performance
Test Condition & Result
VAC (V)
90
115
130
180
220
240
264
IIN (A)
0.13
0.10
0.09
0.07
0.06
0.05
0.05
VOUT (V)
50
50
50
50
50
50
50
IOUT (A)
0.20
0.20
0.20
0.20
0.20
0.20
0.20
PIN (W)
11.3
11.5
11.6
12.1
12.3
12.5
12.7
POUT (W)
9.9
9.9
9.9
9.9
9.95
9.95
9.95
Efficiency (%)
87.3
86.1
85.6
82.1
80.8
79.7
78.5
Power Factor
0.9797
0.9792
0.9764
0.9613
0.9418
0.9287
0.9096
Note: The Efficiency & Power Factory will be affect by Power MOSFET, Capacitor and Inductor selection.
Output Waveform @ VAC 90V
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6/8
Rev A
TS19702
APPLICATION NOTE
Designing with the TS19702
Single-Stage High Power Factor Corrector LED Driver
Output Waveform @ VAC 130V
Output Waveform @ VAC 220V
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7/8
Rev A
TS19702
APPLICATION NOTE
Designing with the TS19702
Single-Stage High Power Factor Corrector LED Driver
Output Waveform @ VAC 264V
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8/8
Rev A
TS19702 Application Test
Test Condition:
VAC Input voltage : 85V~264V
VLED Output voltage : 30V
ILED Output Current : 180mA
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CONFIDENTIAL
Application Circuit
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CONFIDENTIAL
BOM List
item
ref
CONFIDENTIAL
description, part number
package
數量
1
IC1
TS19702CX6
SOT-26
1
2
R3,R4
SMD 1206 330kΩ 5% 1/4W
1206
2
3
R5,R7
SMD 0805 10Ω 5% 1/8W
0805
2
4
R6
SMD 1206 1.1Ω 1% 1/4W
1206
1
5
C3
SMD 0805 1uF/25V 10% X7R
0805
1
6
BD1
Bridge Diode 0.8/600V RMB6S
MBS
1
7
D1
Super Fast Diode SF38G
DO-201AD
1
8
DZ1
Zener Diode 12V/0.8W BZD27C12P
Sub SMA
1
9
D2
Super Fast Diode ES2J 2A/600V SMB
DO-214AA
1
10
C1
Capacitor-MPP 0.1uF/450V 105℃ 10% 陶瓷電容
11
C4
10uF 50V 5*11 電解電容
12
C5
Capacitor-EC 220uF/100V 電解電容
13
CX1
Capacitor-X1 0.1uF/VAC300V 20% 13x12x6
13*12*6mm
1
14
Q1
MOSFET 2NB60 2A/600V
TO-251
1
15
F1
FUSE 1.25A/250V
8.4*4*8.4mm
1
16
L1
CHOKE 3.3mH
DR10*20
1
17
ZD2
Zener Diode 33V/0.8W BZD27C33P
Sub SMA
1
18
R9
SMD 1206 30KΩ 1% 1/4W
1206
1
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1
5*11
1
1
Output current curve
CONFIDENTIAL
TS19702 Input Voltage VS Output current
Output current_mA
180
178
176
Vout=30V
174
172
170
85
105
125
145
165
185
Input Voltage_V
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205
225
245
265
TS19702
TS19601
宽电压高效率（≧90%）高 PF（≧90）
16 个元器件低成本（6.5RMB），恒流（误
差 3%内）
IC --TS19702
（1） 宽电压（90-264V）
（2） 双 90（PF 值与效率），单级 PFC
（3） 恒流（误差 3%内）
（4） 非隔离方案（E27 球泡灯, T5, T8 日
光灯）
（5） 开路，短路，过流，过温保护
（6） BOM（16 个元器件，PCBA 成本在
6.5RMB 左右）
IC --TS19601
路灯 DC-DC 线性恒流 IC
(1) 线性恒流，没有 EMC 问题
(2) 电路简单，外围电路只有一个电阻与电
容
(3) IC --TO-252 封装
(4) 效率可以到 98%，瓦数可以做到 60W
联系方式: Peter
QQ:1347099506
Mobile:136 3163 5290
台湾半导体厂（深圳办）
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VAC 180V
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CONFIDENTIAL
VAC 200V
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VAC 220V
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VAC 240V
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CONFIDENTIAL
VAC 264V
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CONFIDENTIAL