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TS19460 Datenblatt(PDF) 5 Page - Taiwan Semiconductor Company, Ltd

Teilenummer TS19460
Bauteilbeschribung  AC/DC WLED Driver with External MOSFET Universal High Brightness
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Hersteller  TSC [Taiwan Semiconductor Company, Ltd]
Direct Link  http://www.taiwansemi.com
Logo TSC - Taiwan Semiconductor Company, Ltd

TS19460 Datenblatt(HTML) 5 Page - Taiwan Semiconductor Company, Ltd

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TS19460
AC/DC WLED Driver with External MOSFET
Universal High Brightness
5/7
Version: A12
Application Information (Continue)
The input current drawn from the VIN pin is a sum of the 1.0mA current drawn by the internal circuit and the current
drawn by the GATE driver (which in turn depends on the switching frequency and the GATE charge of the external
IIN ≈ 1mA + QG x fS
In the above equation, fS is the switching frequency and QG is the GATE charge of the external MOSFET (which
can be obtained from the datasheet of the MOSFET).
Oscillator
The oscillator in the TS19460 is controlled by a single resistor connected at the RT pin. The equation governing the
oscillator time period tOSC is given by:
TOFF(uS) = ( RT(KΩ) / 25 ) + 0.3
Linear Dimming
The Linear Dimming pin is used to control the LED current, when voltage at LD is fall below 1.5V, the internal
reference voltage (250mV) to the constant current feedback become over ridden by VLD * 0.181, and the current in
the inductor remain continuous, the LED current is given by ILED = ( VLD * 0.181 ) / RCS, The Gate output is disable
when LD voltage <150mV(typ.) and recovery when LD voltage >200mV (typ.)
The Linear Dimming input could also be used for mixed-mode dimming to expand the dimming ratio, in this kind of
application condition, the pulse-width modulated signal of a measured amplitude below 1.5V should be applied at
LD.
PWM Dimming
PWM Dimming can be achieved by driving the PWMD pin with a square wave signal. The rising and falling edges
are limited by current slew rate in inductor, the first switching cycle is terminated upon reaching the level (250mV)
at CS, the circuit is further reaching its steady state within 3~5 switching cycle regardless of the switching
frequency.


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