TS19705
Single-Stage PFC
Primary-Side-Regulation LED Driver
SOT-26
Pin Definition:
1. Compensation
2. Ground
3. Current Sense
4. Output
5. V
CC
6. DMG
Description
TS19705 is a primary-side-regulation with Fly-back control IC with active power factor correction function for LED
lighting applications. The IC achieves high power factor and low Total Harmonic Distortion (THD) operation by
Boundary Conduction Mode (BCM). The line and load regulation of LED current is about <±3% because of
particular control method.
TS19705 also provides gate driving voltage clamping, V
CC
overvoltage protection and system output open/short
circuit protection to increase IC performance.
Features
● Constant Current Accuracy within <±3%
● Primary-Side Feedback Control
●
●
●
●
●
●
●
●
●
●
Application Voltage Range: 90~ 264V
AC
Transition-Mode PFC Operating
Built-in Active Power Factor Correction
Constant Output Current Control
Good Line and Load Regulation
Open-LED Protection on DMG pin
Over-Voltage Protection on V
CC
pin
Short-LED Protection
Cycle by Cycle Over Current Protection on CS pin
Over-Temperature Protection
Applications
● E27, T5, T8 LED Lighting
● LED Bulb
● LED Down Light
●
LED Lighting Applications
Ordering Information
Part No.
TS19705CX6 RFG
Package
SOT-26
Packing
3kpcs / 7” Reel
Note:
“G” denote for Halogen Free Product
● Gate Driving Voltage Clamping
Absolute Maximum Ratings
(T
A
= 25
o
C unless otherwise noted)
(Note 1)
Parameter
Power supply pin
DMG voltage to GND
OUT voltage to GND
CS voltage to GND
COM voltage to GND
Junction Temperature Range
Storage Temperature Range
Power Dissipation @T
A
=25 °C
ESD Rating (Human Body Model)
Symbol
V
CC
V
DMG
V
OUT
V
CS
V
COM
T
J
T
STG
P
D
ESD
Range
40
-0.3 to 40
-0.3 to 40
-0.3 to 5.5
-0.3 to 5
-40 to +150
-65 to +150
0.3
2
Unit
V
V
V
V
V
°C
°C
W
kV
Thermal Information
(Note 2)
Parameter
Thermal Resistance Junction to Ambient
Thermal Resistance Junction to Case
Symbol
R
θJA
R
θJC
Range
220
106.6
Unit
°C/W
°C/W
1/7
Version: B14
TS19705
Single-Stage PFC
Primary-Side-Regulation LED Driver
Recommended Operating Conditions
Parameter
Power supply pin
DMG voltage to GND
OUT voltage to GND
CS voltage to GND
COM voltage to GND
Operating Junction Temperature Range
Operating Ambient Temperature Range
Symbol
V
CC
V
DMG
V
OUT
V
CS
V
COM
T
J
T
OPA
Conditions
38
-0.3 to 38
-0.3 to 38
-0.3 to 5
-0.3 to V
CC
-40 to +125
-40 to +85
Unit
V
V
V
V
V
°C
°C
Electrical Characteristics
(V
CC
=15 , T
A
=25℃, unless otherwise specified)
Parameter
Turn-on voltage
Turn-off voltage
Quiescent current 1
Quiescent current 2
Operation supply current
Protection
VCC voltage protection
Output voltage protection
CS limit voltage
Short circuit protection
Oscillator
Start-up timer
GM Amplifier
Transconductance
Sink current
Source current
Driver
Dropout voltage
Rising time
Falling time
Output clamp voltage
Leading edge blanking time
V
OH
V
OL
t
r
t
f
V
O_CLAMP
LEB
t
V
CC
=33V, I
O
= 10mA
V
CC
=33V, I
O
= -10mA
V
CC
=20V, C
O
=1nF
V
CC
=20V, C
O
=1nF
--
--
--
--
--
--
1.2
0.12
40
80
--
0.5
1.5
--
--
--
19
--
V
V
ns
ns
V
ns
g
m
I
COMP_SINK
I
COMP_SOU
--
--
--
60
20
20
--
--
--
µA/V
µA
µA
t
STR
--
220
--
µs
V
OVPA
V
OVPS
V
OCP
V
SCP
Guaranteed by design
Symbol
V
CC_ON
V
CC_OFF
I
Q1
I
Q2
I
CC
Condition
Min
17
8.5
Typ
18
9.5
30
600
2.5
Max
19
10
50
800
3..0
Unit
V
V
µA
µA
mA
V
CC
=17V, @ V
CC
off
Start-up @ 4.5kHz
--
--
--
31
10
1.15
--
32
10.5
1.25
3
34
11
1.35
--
V
V
V
V
Note:
1.
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device.
2.
Thermal Resistance is specified with the component mounted on a low effective thermal conductivity test board
in free air at T
A
=25°C.
2/7
Version: B14
TS19705
Single-Stage PFC
Primary-Side-Regulation LED Driver
Function Block
Pin Description
Pin No.
1
2
3
4
5
6
Name
COM
GND
CS
OUT
V
CC
DMG
Function
Output pin of error amplifier.
Ground return for all internal circuitry.
Input current sense pin.
Power MOS output pin.
Power supply pin for all internal circuitry.
Zero current demagnetization sensing.
Typical Application Circuit
3/7
Version: B14
TS19705
Single-Stage PFC
Primary-Side-Regulation LED Driver
Application Information
Function Description
The TS19705 is a constant current Fly-back controller with primary side control and PFC function for LED lighting
applications. The controller is Boundary Conduction Mode (BCM) operation with constant on time based regulator
design to achieve high power factor performance.
The TS19705 has built-in V
CC
over voltage protection, open LED protection, short LED protection, over temperature
protection, primary side current limit and gate clamp functions.
The average output current can be expressed as below.
Where :
I
O_avg
is the
average output current
N
P
is the primary-side turn ratio
N
S
is the secondary-side turn ratio
R
S
is the sensing resistor connected between the MOSFET source and the GND
Pin Detail
Compensation
This is the output of the g
m
amplifier. Connect with a suitable RC network to ground.
Ground
GND is the reference node of internal circuit.
Current Sense
MOSFET current signal sensing for multiplication and current limit setting function.
Where :
I
CS
is the input current sence
R
S
is the
sensing resistor connected between the MOSFET source and GND
Output
Gate drive for external MOSFET switch and is built-in
gate clamp function.
V
CC
Power supply for the controller during normal operation. The controller will start up when V
CC
reaches 18V (typical)
and will shut-down when V
CC
voltage is below 9.5V (typical). A decoupling capacitor should be connected between
the V
CC
and GND pin as close as possible.
The TS19705 performs V
CC
over voltage protection though V
CC
pin. Once V
CC
pin exceeds in 32V, TS19705 turns
off and latchs out the MOSFET switcher until V
CC
goes below V
CC_OFF
.
4/7
Version: B14
TS19705
Single-Stage PFC
Primary-Side-Regulation LED Driver
Application Information (Continue)
DMG
The Output voltage is reflected by the auxiliary winding (N
AUX
) voltage of Flyback transformer, the DMG pin can
sense output information to depart from start up voltage (V
O_STR
) and protection voltage (V
O_OVP
).
When DMG sense voltage under V
O_STR
, the circuit will work on short circuit protection, f
STR
=1/t
STR
.
When DMG sense voltage over V
O_OVP
, the circuit will work on over voltage protection, it will latchs out until V
CC
goes below V
CC_OFF
.
Rvcc
VCC
L
A
N
AUX
R2
R1
DMG
Where :
V
OUT_OVP
is the output-over-voltage protection point
V
OVPS
is the over voltage protection signal
V
O_STR
is the start-up timer
N
AUX
is the number of auxiliary-winding turns
N
SEC
is the number of secondary-winding turns
5/7
Version: B14
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