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TS19378
Taiwan Semiconductor
Document Number: DS_P0000199
1
Version: B15
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
COUT ESR Range
R2
C7
30~80mΩ
470R
10nF
80~300mΩ
100R
15nF


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