TS19377 [TSC]
2A Buck (Step-down) WLED Driver; 2A降压（步降） WLED驱动器
| 型号： | TS19377 |
| 厂家： | 
TAIWAN SEMICONDUCTOR COMPANY, LTD |
| 描述： | 2A Buck (Step-down) WLED Driver |
| 文件： | 总7页 (文件大小：119K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
TS19377
2A Buck (Step-down) WLED Driver
SOP-8
Pin Definition:
1. FB
8. GND
2. EN
3. Comp
4. Vcc
7. GND
6. SW
5. SW
General Description
TS19377 consists of step-down switching regulator with PWM control. These devise include a reference voltage
source, oscillation circuit, error amplifier, internal PMOS and etc.
TS19377 provides low-ripple power, high efficiency, and excellent transient characteristics. The PWM control
circuit is able to the duty ratio linearly from 0 up to 100%. An enable function, an over current protect function and
short circuit protect function are built inside, and when OCP or SCP happens, the operation frequency will be
reduced. Also, an internal compensation block is built in to minimum external component count.
With the addition of an internal P-channel Power MOS, a coil, capacitors, and a diode connected externally, these
ICs can function as step-down switching regulators. They serve as ideal power supply units for portable devices
when coupled with the SOP-8 package, providing such outstanding features as low current consumption. Since
this converter can accommodate an input voltage up to 23V, it is also suitable for the operation via an AC adapter.
Features
Application
●
●
●
●
●
●
●
●
●
Input Voltage Range 3.6V~23V
●
●
●
●
White LED Backlighting
Output voltage: 0.25V~Vcc
2A Switch Output Current
White LED Driving
Multiple LED Driving
LED Lighting Equipment
Duty ratio: 0%~100% PWM control
330kHz Switching Frequency
Enable/Disable Functions
Ordering Information
Current limit and Thermal Shutdown
Short Circuit Protections
Part No.
Package
Packing
Built-in Internal SW P-CH MOS
TS19377CS RLG
SOP-8
2.5Kpcs / 13” Reel
Note: “G” denotes Halogen Free Product.
Block Diagram
SW
Oscillator
Circuit
ReferenceVoltage
Vcc
+
PWMSwitched
Control Circuit
-
FB
Thermal
Shutdown
Vss
Current
Limit
V
EN
Comp
EN
1/7
Version: A11
TS19377
2A Buck (Step-down) WLED Driver
Absolute Maximum Rating
Parameter
Symbol
Limit
Unit
VCC Pin Voltage
VCC
VFB
VEN
VSW
PD
VSS - 0.3 to VSS + 25
VSS - 0.3 to VCC
VSS - 0.3 to VCC + 0.3
VSS - 0.3 to VCC + 0.3
Internally limited
-40 to +150
V
V
Feedback Pin Voltage
ON/OFF Pin Voltage
V
Switch Pin Voltage
V
Power Dissipation
mW
°C
Storage Temperature Range
Operating Temperature Range
Operating Supply Voltage
Thermal Resistance from Junction to case
TST
TOP
VOP
-40 to +125
°C
+3.6 to +23
V
θ
JC
25
°C/W
Electrical Specifications (VIN=12V, TA =25oC, unless otherwise noted)
Parameter
Symbol
VFB
Conditions
Min
0.24
--
Typ
0.25
3
Max Units
Feedback Voltage
Quiescent Current
Feedback Bias Current
Shutdown Supply Current
Switch Current
IOUT=0.2A
0.26
5
V
mA
uA
uA
A
ICCQ
IFB
VFB=1.2V force driver off
IOUT=0.1A
--
0.1
2
0.5
10
--
ISD
VEN =0V
--
ISW
2.5
--
--
Line Regulation
△VOUT/VOUT VCC=5V~23V, IOUT=0.2A
△VOUT/VOUT IOUT=0.1 to 2A
FOSC
1
2
%
Load Regulation
--
0.2
330
--
0.5
400
--
%
Oscillation Frequency
260
2.0
--
KHz
VSH
VSL
ISH
High (regulator ON)
Low (regulator OFF)
VEN=2.5V (ON)
EN Pin Logic input threshold voltage
EN Pin Input Current
V
--
0.8
--
--
20
-10
100
70
91
91
140
uA
uA
ISL
VEN=0.3V (OFF)
VCC=5V, VFB=0V
VCC=12V, VFB=0V
--
--
--
140
100
--
Internal MOSFET RDSON
RDSON
mΩ
--
IOUT=1A
VOUT = 5V
--
Efficiency
EFFI
TSD
%
°C
IOUT=2A
--
--
Thermal shutdown Temp
--
--
2/7
Version: A11
TS19377
2A Buck (Step-down) WLED Driver
Typical Application Circuit
A: 1W/3W LED*1 for DC Input
U1
VCC
1
2
3
4
8
FB
VSS
VOUT
R1
100K
7
6
5
EN
VSS
SW
SW
L1
D7
COMP
VCC
22uH
(
LED
AA
R4
4.7K
1N4148
D6
Option
R2
C4
1u
C3
0.75R/0.33R
1W/3W
C1
C2
22u
D5
R5
100K
0.1u
4.7u
B240A
Recommend Bill of Material:
ILED
R2
C2
R5
L1
350mA
750mA
1000mA
0.715Ω
0.333Ω
0.250Ω
87.5mW
189mW
250mW
100uF
220uF
330uF
0.22K
0.47K
0.47K
68uH
B: 1W/3W LED*1 for AC Input
ꢀ
No output Capacitor
U1
1
8
FB
VSS
VOUT
2
7
6
5
EN
VSS
SW
SW
L1
D2
AC D4
AC
3
COMP
12V IN
4
AC D3
LED
VCC
AC D2
AC D1
AX2002/A
R5
R2
C3
D5
B240A
C5
100nF
C2
0.1u
ILED
R2
C2
R5
L1
350mA
750mA
1000mA
0.715Ω
0.333Ω
0.250Ω
87.5mW
189mW
250mW
100uF
0.22K
0.47K
0.47K
220uF
330uF
68uH
3/7
Version: A11
TS19377
2A Buck (Step-down) WLED Driver
Function Descriptions
PWM Control
The TS19377 consists of DC/DC converters that employ a pulse-width modulation (PWM) system. In converters of
the TS19377, the pulse width varies in a range from 0 to 100%, according to the load current. The ripple voltage
produced by the switching can easily be removed through a filter because the switching frequency remains
constant. Therefore, these converters provide a low-ripple power over broad ranges of input voltage and load
current.
Setting ILED Current
Application circuit item shows the basic application circuit with TS19377 adjustable output version. The external
resistor sets the LED output current according to the following formula:
ILED=(0.25V/R2)
Resistor select for LED output current setting
ILED
R2
350mA
750mA
1000mA
0.715Ω
0.333Ω
0.250Ω
87.5mW
189mW
250mW
RDS(ON) Current Liming
The current limit threshold is setting by the internal circuit.
Compensation
Please refer the table of application circuit. For DC input, the option circuit for compensation is connecting R4 and
a 1N4148 diode to VOUT. In order to protect short circuit and thermal shutdown release for LED.
4/7
Version: A11
TS19377
2A Buck (Step-down) WLED Driver
Electrical Characteristics Curve
Figure 1. Quiescent Current vs. Temperature
Figure 2. Shutdown Current vs. Temperature
Figure 3. Feedback Voltage vs. Temperature
Figure 4. Feedback Voltage vs. Input Voltage
Figure 6. Efficiency vs. Output Current
Figure 5. Frequency vs. Temperature
5/7
Version: A11
TS19377
2A Buck (Step-down) WLED Driver
SOP-8 Mechanical Drawing
SOP-8 DIMENSION
MILLIMETERS
INCHES
MIN
DIM
MIN
4.80
3.80
1.35
0.35
0.40
MAX
5.00
4.00
1.75
0.49
1.25
MAX.
0.196
0.157
0.068
0.019
0.049
A
B
C
D
F
0.189
0.150
0.054
0.014
0.016
G
K
M
P
R
1.27BSC
0.05BSC
0.10
0º
0.25
7º
0.004
0º
0.009
7º
5.80
0.25
6.20
0.50
0.229
0.010
0.244
0.019
Marking Diagram
Y = Year Code
M = 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)
L = Lot Code
6/7
Version: A11
TS19377
2A 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.
7/7
Version: A11
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