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PDF TS19450 Data sheet ( Hoja de datos )
| Número de pieza | TS19450 | |
| Descripción | AC/DC WLED Driver | |
| Fabricantes | Taiwan Semiconductor | |
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Hay una vista previa y un enlace de descarga de TS19450 (archivo pdf) en la parte inferior de esta página. Total 10 Páginas | ||
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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
1 page  
FUNCTION BLOCK DIAGRAM
TS19450
Taiwan Semiconductor
PIN DESCRIPTION
PIN NO.
1
2
3
4
5
6
7
8
NAME
VIN
CS
GND
GATE
PWMD
VDD
LD
RT
FUNCTION
This pin is the input of 8V~450V linear regulator
This pin is the current sense pin used to sense the MOSFET current by means
of an external sense resistor. When this pin exceeds the low of either the
internal 250mV or the voltage at the LD pin, the GATE output goes low
Ground return for all internal circuitry. This pin must be electrically connected
to the ground of the power train.
This pin is the output GATE driver for an external N-CH Power MOSFET
This is the PWM dimming input of the IC. When this pin is pulled to GND, the
Gate Driver is turned off. When the pin is pulled high, the GATE driver
operates normally.
This is the power supply pin for all internal circuits.
It must be bypassed with a low ESR capacitor to GND (≥0.1µF)
This pin is the linear dimming input and sets the current sense threshold as
long as the voltage at the pin is less than 250mV (typ.)
This pin sets the oscillator frequency. When a resistor is connected between
RT and GND, the IC operates in constant frequency mode. When the resistor
is connected between RT and GATE, the IC operates in constant off-time
mode.
Document Number: DS_P0000187
5
Version: B15
5 Page | ||
| Páginas | Total 10 Páginas | |
| PDF Descargar | [ Datasheet TS19450.PDF ] | |
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