TS19378_15 Datasheet, PDF (1/7 Pages) Taiwan Semiconductor Company, Ltd – 2A Buck (Step-down) WLED Driver

TS19378
Taiwan Semiconductor
2A Buck (Step-down) WLED Driver
DESCRIPTION
The TS19378 is a high voltage step-down converter
designed for driving up to 10 series white LEDs from a
40V system input. The total LED driving current up to
2A, which is measured through an external current
sense resistor. Its low 200mV feedback voltage
reduces power loss and improves efficiency. The OVP
pin monitors the output voltage and turns off the
converter if an over-voltage condition is present due to
an open circuit condition. The TS19378 includes
current limit, short circuit protection and thermal
shutdown protection preventing damage.
TS19378 provides high power, high efficiency, and
excellent transient characteristics. The PWM control
circuit is able to the duty ratio linearly from 0 up to
100%. Since this converter can accommodate an
input voltage up to 40V, it is also suitable for the
operation via an AC adapter.
FEATURES
● Input Voltage Range 8V~40V
● Output voltage up to 38V
● 2A Switch Output Current
● Duty ratio: 0%~100% PWM control
● 300kHz Switching Frequency
● Enable/Disable Functions
● Soft Start Time Control
● Current limit and Thermal Shutdown
● Short Circuit Protections
● Built-in Internal SW P-CH MOSFET
APPLICATION
● White LED Backlighting
● High Power LED Application
● Multiple LED Driving
● LED Lighting Equipment
SOP-8EP
Pin Definition:
1. EN/SS
8. COMP
2. GND
7. FB
3. VGATE
6. OVP
4. VCC
5. SW (Connected to exposed pad)
Notes: Moisture sensitivity level: level 3. Per J-STD-020
TYPICAL APPLICATION CIRCUIT
Document Number: DS_P0000199
COUT ESR Range
30~80mΩ
80~300mΩ
R2
470R
100R
C7
10nF
15nF
1
Version: B15