TS19373CX5RF [TSC]
800mA Buck (Step-down) WLED Driver; 800毫安降压（步降） WLED驱动器
| 型号： | TS19373CX5RF |
| 厂家： | 
TAIWAN SEMICONDUCTOR COMPANY, LTD |
| 描述： | 800mA Buck (Step-down) WLED Driver |
| 文件： | 总7页 (文件大小：383K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
TS19373
800mA Buck (Step-down) WLED Driver
Pin Definition:
1. VIN
SOT-25
2. Ground
3. CT
4. ISENSE
5. SW
General Description
The TS19373 is a continuous mode inductive step-down converter, designed for driving single or multiple series
connected LEDs efficiently from a voltage source higher than the LED voltage. The device operates from an input
supply between 6V and 40V and provides an externally adjustable output current of up to 800mA.
TS19373 includes the output switch and a high-side output current sensing circuit, which uses an external resistor to
set the nominal average output current.ꢀ
Features
Application
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DC/DC or AC/DC LED driver applications
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Wide Input Voltage Range 6V~40V
Back lighting of flat panel displays
Signage and decorative LED lightings
Chargers
800mA Output Current
High Efficiency up to 90%
Drives up to 3 (1~3W) LEDs @ VIN 12V
Drives up to 7 (1~3W) LEDs @ VIN 24V
180kHz Switching Frequency
Internal PWM Filter
LED Lighting Equipment – MR16, Tube
Ordering Information
Part No.
Package
SOT-25
Packing
TS19373CX5 RF
3Kpcs / 7” Reel
Block Diagram
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Version: A09
TS19373
800mA Buck (Step-down) WLED Driver
Absolute Maximum Rating
Parameter
Symbol
Limit
Unit
Input Voltage
VIN
VIN
VFB
VSW
ISW
TA
40
6 ~ 40
-0.3 ~ 40
36
V
V
Supply Voltage (Recommended)
FB Voltage
V
SW Voltage
V
Output SW Current
Ambient Temperature Range
Junction Temperature Range
800
mA
oC
oC
-40 to +85
+150
TJ
Electrical Specifications (Ta = 25oC, unless otherwise noted)
Parameter
Symbol
Test Conditions
Min
Typ
Max
Units
Input Voltage Range
Line Regulation
VIN
REGLINE
ICHARGE
IDISCHARGE
FOSC
6
--
--
1.4
30
230
180
--
40
5
V
mV
uA
uA
kHz
mV
V
Charge Current
VIN =6V~40V
--
45
290
--
Discharge Current
Switching Frequency
Current Limit Sense Voltage
Switch VCESAT
VIN =6V~40V
180
--
CT =100pF,
VSENSE
VSAT
IDISCHARGE = ICHARGE
ISW = 300mA
250
--
350
1.3
4
1.0
3
Supply Current
ICC
VIN =6V~40V, CT =1nF
VCE =40V
--
mA
uA
Collector off-state Current
IC(OFF)
1
100
Note:ꢀLow duty cycle pulse techniques are used during test to maintain junction temperature as close to ambient
temperature as possible
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Version: A09
TS19373
800mA Buck (Step-down) WLED Driver
Application Information
Pin Description
Pin
1
Function
VIN
Description
Input Voltage Supply pin
2
Ground
Ground Pin
3
Timing Capacitor
Timing capacitor oscillator input
Peak current sense input to monitor the voltage drop across an external
resistor to limit the peak current through the circuit
Switching Pin. This is the internal Darlington switch collector
4
5
ISENSE
SW
Inductor Selection
A 100uH inductor is recommended for most TS19373 applications. Although small size and high efficiency are major
concerns, the inductor should have low core losses at 180kHz and low DCR (copper wire resistance).
Diode Selection
Schottky diodes, with their low forward voltage drop and fast reverse recovery, are the ideal choices for TS19373
applications. The forward voltage drop of a Schottky diode represents the conduction losses in the diode while the
diode capacitance represents the switching losses. For diode selection, both forward voltage drop and diode
capacitance need to be considered. Schottky diodes with higher current ratings usually have lower forward voltage
drop and larger diode capacitance, which can cause significant switching losses at the 180kHz switching frequency of
the TS19373.
Capacitor Selection
For Input capacitor and timing capacitor are able to use small ceramic capacitor for most of TS19373 applications.
When AC input, to add a 100µF electric capacitor for input capacitor is recommended.
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Version: A09
TS19373
800mA Buck (Step-down) WLED Driver
Typical Application Circuit
Input Voltage vs. Efficiency
Reference Design Information
VIN Range
L
LED
(Series)
3pcs
Current
(mA)
300
Efficiency
(V)
12
24
(uH)
68
(%)
89
100
7pcs
300
90
Typical Application Circuit – LED Tubeꢀ
Bill of Materials:
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Designation
Description
TS19373CX5
SS14L
Package
SOT-25
SMA
--
Manufacture
Remark
LED Driver
TSC
--
D1,2,3,4,5
TSC
1A, 40V
L1
R1
Cin
C1
C2
100uH
Generic
Generic
Generic
Generic
Generic
Isat >ꢀ500mA
--
0.5Ω
1206
805
10uF
Ceramic
Ceramic
200pF
805
100uF
Tantalum or Electrolysis * AC Input
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Version: A09
TS19373
800mA Buck (Step-down) WLED Driver
Typical Application Circuit – MR16ꢀ
ꢀ
Bill of Materials:ꢀ
Designation
Description
TS19373CX5
SS14L
Package
SOT-25
SMA
--
Manufacture
Remark
LED Driver
TSC
--
D1,2,3,4,5
TSC
1A, 40V
L1
R1
Cin
C1
C2
100uH
Generic
Generic
Generic
Generic
Generic
Isat >ꢀ500mA
0.5Ω
1206
805
--
Ceramic
10uF
200pF
805
Ceramic
100uF
Tantalum or Electrolysis * AC Input
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Version: A09
TS19373
800mA Buck (Step-down) WLED Driver
ꢀ
SOT-25 Mechanical Drawing
SOT-25 DIMENSION
MILLIMETERS
INCHES
MIN
DIM
MIN
0.09
0.30
0.09
2.70
1.40
MAX
1.25
0.50
0.25
3.10
1.80
MAX.
0.0492
0.0197
0.0098
0.1220
0.0709
A+A1
B
C
D
E
0.0354
0.0118
0.0035
0.1063
0.0551
e
1.90 BSC
0.0748 BSC
H
L
Ө1
S1
2.40
0.35 BSC
0º
3.00
0.09449
0.1181
10º
0.0138 BSC
0º
0.0374 BSC
10º
0.95 BSC
Marking Diagram
73 = Device Code
= Year Code
M = Month Code
Y
(A=Jan, B=Feb, C=Mar, D=Apl, E=May, F=Jun, G=Jul, H=Aug,
I=Sep, J=Oct, K=Nov, L=Dec)
L
= Lot Code
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Version: A09
TS19373
800mA Buck (Step-down) WLED 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.
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Version: A09
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