TS19450 Datasheet, PDF (1/8 Pages) Taiwan Semiconductor Company, Ltd – AC/DC WLED Driver with External MOSFET Universal High Brightness

TS19450
AC/DC WLED Driver with External MOSFET
Universal High Brightness
SOP-8
Pin Definition:
1. VIN
8. RT
2. CS
7. LD
3. GND
6. VDD
4. Gate
5. PWMD
General 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 and
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
Ordering Information
Part No.
TS19450CS RL
Package
SOP-8
Typical Application Circuit
Packing
2.5Kpcs / 13” Reel
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
Absolute Maximum Rating
Parameter
Input Voltage Range
Internal Regulated Voltage
CS, LD, PWMD, Gate, RT to GND
Continuous Power Dissipation
Storage Temperature Range
Junction Temperature Range
Thermal Resistance – Junction to Ambient
Symbol
V_IN to GND
V_DD to GND
P_D
T_A
T_J
Rθ_JA
1/8
Limit
-0.5 ~ +470
13.5
-0.3 ~ (V_DD+0.3)
630
-65 to +150
-40 to +150
128
Unit
V
V
V
mW
o_C
o_C
o_C/W
Version: A10