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TS19460CSRLG Scheda tecnica(PDF) 5 Page - Taiwan Semiconductor Company, Ltd |
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TS19460CSRLG Scheda tecnica(HTML) 5 Page - Taiwan Semiconductor Company, Ltd |
5 / 7 page 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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