Z
TS19730
Single-Stage Low THD
Buck-Boost PWM Control LED Driver
SOT-26
Pin Definition:
1. V
CC
2. GND
3. OUT
4. CL
5. COM
6. CS
Description
The TS19730 is a high power factor, low THD and high accuracy constant current PWM controller. TS19730
achieves high power factor and high efficiency by boundary current mode (BCM). The line and load regulation of
LED current are within ±2.5%. TS19730 also provides gate driving voltage clamping, V
CC
over-voltage protection,
and system output open/short circuit protection to increase IC performance.
Features
●
●
●
●
●
●
●
●
●
Low THD <10%
Constant Current Accuracy within ±2.5%
High Power Factor >0.9
Low BOM Cost
Boundary Conduction Mode Control
Gate Output Voltage Clamp
LED Open Protection
LED Short protection
Over Current Protection (OCP)
Applications
●
●
●
●
●
LED lighting
Down light
Tube lamp
PAR lamp
Bulb
Ordering Information
Part No.
Package
Packing
TS19730CX6 RFG
SOT-26
3kpcs / 7” Reel
Note:
“G” denotes for Halogen- and Antimony-free as those which
contain <900ppm bromine, <900ppm chlorine (<1500ppm total
Br + Cl) and <1000ppm antimony compounds
● Over Thermal Protection (OTP)
Absolute Maximum Ratings
(Note 1)
Parameter
Power Supply Pin
CL Voltage to GND
OUT Voltage to GND
CS Voltage to GND
COM Voltage to GND
Junction Temperature Range
Storage Temperature Range
Lead Temperature (Soldering 10s)
Power Dissipation @ T
A
=25 °C
ESD Rating (Human Body Mode)
(Note2)
Symbol
V
CC
V
CL
V
OUT
V
CS
V
COM
T
J
T
STG
T
LEAD
P
D
HBM
MM
Range
40
-0.3 to 5.5
-0.3 to 40
-0.3 to 5.5
-0.3 to 5.5
-40 to +150
-65 to +150
260
0.3
2
200
Unit
V
V
V
V
V
°C
°C
°C
W
kV
V
ESD Rating (Machine Mode)
(Note 2)
Thermal Information
(Note 3)
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: A15
Z
TS19730
Single-Stage Low THD
Buck-Boost PWM Control LED Driver
Recommended Operating Conditions
(Note 4)
Parameter
Power Supply Pin
CL 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
CL
V
OUT
V
CS
V
COM
T
J
T
OPA
Conditions
33
-0.3 to 5
-0.3 to 19
-0.3 to 5
-0.3 to 5
-40 to +125
-40 to +85
Unit
V
V
V
V
V
°C
°C
Electrical Characteristics
(V
CC
=18V, T
C
=25°C, unless otherwise specified.)
Parameter
Supply Voltage
Start-up Current
Operating Current
UVLO(off)
UVLO(on)
OVP Level on V
CC
Pin
Voltage Feedback
Feedback Reference Voltage
Transconductance
Output Sink Current
Output Source Current
Current Sensing
Open Loop Voltage
Leading-Edge Blanking Time
Delay to Output
Current Limit
CL Limit Voltage
Switching Frequency
Start Frequency
Gate Driver Output
Rising Time
Falling Time
VGATE-Clamp
Thermal Section
(Note 5,6)
Symbol
V
CC(ST)
I
OPA
V
UVLO(off)
V
UVLO(on)
V
OVP
Condition
V
CC
= V
UVLO(on)
-1V
With 1nF load on out pin
Min
--
--
7
16
29
Typ
45
2.1
8
17.5
31
Max
--
2.6
9
19
33
Unit
μA
mA
V
V
V
V
FB
g
m
I
O-SINK
I
O-SOURCE
0.196
--
--
--
0.2
58
5.8
5.8
0.204
--
--
--
V
μS
μA
μA
V
OLP
t
LEB
t
DELAY
CS Pin Open
--
--
--
5
400
100
--
--
--
V
ns
ns
V
OCP
--
0.3
--
V
f
STR
--
4.5
--
kHz
t
RISE
t
FALL
V
GATE
Load Capacitance =1nF
Load Capacitance =1nF
--
--
--
90
40
12.5
--
--
15
ns
ns
V
Thermal Shutdown
Thermal Shutdown Release
--
--
150
120
--
--
°C
°C
2/7
Version: A15
Z
TS19730
Single-Stage Low THD
Buck-Boost PWM Control LED Driver
Electrical Characteristics (Continue)
Note:
1. Stresses listed as the above “Absolute Maximum Ratings” may cause permanent damage to the device. These
are for stress ratings. Functional operation of the device at these or any other conditions beyond those
indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating
conditions for extended periods may remain possibility to affect device reliability.
2. Devices are ESD sensitive. Handing precaution recommended.
3. Thermal Resistance is specified with the component mounted on a low effective thermal conductivity test board
in free air at T
A
=25°C.
4.
The device is not guaranteed to function outside its operating conditions.
5.
Guaranteed by design.
6. Auto Recovery Type.
Function Block
VCC_OVP
VREF
UVLO/VBG
VCC
START
VREF
OUT
Q
Driver
S
SR
Latch
R
OCP
CL
PRO
(VCC_OVP, OTP)
RST
COM
SAWTOOTH
CS
G
M
VREF
GND
Fig. 1
Pin Description
Pin No.
1
2
3
4
5
6
Name
V
CC
Function
Power supply pin for all internal circuitry.
Ground return for all internal circuitry.
Gate driver output.
Current limit.
Output pin of error amplifier.
Input current sense pin.
GND
OUT
CL
COM
CS
3/7
Version: A15
Z
TS19730
Single-Stage Low THD
Buck-Boost PWM Control LED Driver
Typical Application Circuit
Fuse
MOV
AC Input
90V~264V
TS19730
VCC
CS
GND
COM
OUT
CL
R
CL
R
S
Fig. 2
Application Information
Start-up Current
The typical start-up current is around 45μA. Very low start-up current allows the PWM controller to increase the
value of start-up resistor and then reduce the power dissipation.
UVLO(Under Voltage Lockout)
A hysteresis UVLO comparator is implemented in TS19730. The turn-on and turn-off thresholds level are fixed at
17.5V and 8V respectively. This hysteresis shown in Fig.3 ensures that the start-up capacitor will be adequate to
supply the chip during start-up. For quick start-up of the LED driver, the start-up resistor should be matched with
the start-up capacitor.
V
CC
V
UVLO(on)
V
UVLO(off)
17.5V
8V
Fig. 3
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 400ns 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 cannot switch off the gate driver.
OCP(Over Current Protection)
The TS19730 has built-in cycle by cycle over current protection function on CL pin. As the CL pin voltage is larger
than V
OCP
(0.3V), the gate output will be turned off immediately to avoid the driver board to be burned out.
4/7
Version: A15
Z
TS19730
Single-Stage Low THD
Buck-Boost PWM Control LED Driver
Application Information (Continue)
OVP (Over Voltage Protection) on V
CC
To prevent the LED driver from being damaged, the TS19730 has an implemented OVP function on V
CC
. When the
V
CC
voltage is higher than the V
OVP
(31V), 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. If the OVP condition
happens, the pulses will be stopped until the V
CC
pin voltage is down to the UVLO off level. The
TS19730 is
working in an auto-recovery mode as shown in Fig. 4.
V
CC
V
OVP
V
UVLO(on)
V
UVLO(off)
OUT
Non-Switching
Fig. 4
Gate Clamp
Driver is clamped to 12.5V by an internal clamping circuit to avoid the Gate of MOSFET to get damaged.
5/7
Version: A15
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