TS19450_15 Datasheet, PDF (1/10 Pages) Taiwan Semiconductor Company, Ltd – AC/DC WLED Driver with External MOSFET Universal High Brightness

TS19450
Taiwan Semiconductor
AC/DC WLED Driver with External MOSFET
Universal High Brightness
DESCRIPTION
The TS19450 is an open loop, current mode control
LED driver IC. It can be programmed to operate in
either a constant frequency or constant off-time mode.
It includes an 8V~450V linear regulator which allows it
to work from a wide range of input voltages without the
need for an external low voltage supply. The TS19450
includes a PWM dimming input that can accept an
external control signal with a duty ratio of 0~100% and
a frequency of up to a few kHz. It also includes a
0~250mV linear dimming input which can be used for
linear dimming of the LED current.
The TS19450 is ideally suited for buck LED drivers.
Since it operates in open loop current mode control,
the controller achieves good output current
regulation without the need for any loop
compensation. PWM dimming response is limited
only by the rate of rise and fall of the inductor
current, enabling very fast rise and fall times. The
TS19450 requires only free external components
(apart from the power stage) to produce a controlled
LED current making it an ideal solution for low cost
LED drivers.
FEATURES
● Switch mode controller for single switch LED
drivers
● Open loop peak current controller
● Internal 8V~450V linear regulator
● Constant frequency or constant off-time operation
● Linear and PWM dimming capability
● Requires few external components for operation
APPLICATION
● DC/DC or AC/DC LED driver applications
● RGB backlighting LED driver
● Back lighting of flat panel displays
● General purpose constant current source
● Signage and decorative LED lighting
● Charger
SOP-8
Pin Definition:
1. VIN
8. RT
2. CS
7. LD
3. GND 6. VDD
4. Gate 5. PWMD
Notes: Moisture sensitivity level: level 3. Per J-STD-020
TYPICAL APPLICATION CIRCUIT
Document Number: DS_P0000187
1
Version: B15