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TS19702 Datasheet(PDF) 4 Page - Taiwan Semiconductor Company, Ltd |
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TS19702 Datasheet(HTML) 4 Page - Taiwan Semiconductor Company, Ltd |
4 / 9 page TS19702 High Power Factor Corrector LED Driver 4/9 Version: A12 Application Circuit Application Information Start-up Current The typical start-up current is around 8µA. Very low start-up current allows the PWM controller to increase the value of start-up resistor and then reduce the power dissipation on it. UVLO (Under Voltage Lockout) A hysteresis UVLO comparator is implemented in TS19702, then the turn-on and turn-off thresholds level are fixed at 15V and 8V respectively. This hysteresis shown in Fig.11 ensures that the start-up capacitor will be adequate to supply the chip during start-up. For quickly startup the LED driver, the start-up resistor should be matched with the startup capacitor. Due to the low UVLO on level, so the turn-on delay time will also never greater than the general PWM IC. Oscillator The maximum duty-cycle of internal oscillator is up to 90% for driving high LED voltage string. The frequency of the oscillator is fixed to 45KHz by internal setting. LEB (Leading-Edge Blanking) Each time the power MOSFET is switched on, a turn-on spike will inevitably occur at the sense resistor. To avoid fault trigger, a 410ns leading-edge blanking time is built in. Conventional RC filtering can therefore be omitted. During this blanking period, the current-limit comparator is disabled and can not switch off the gate driver. |
Similar Part No. - TS19702_14 |
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Similar Description - TS19702_14 |
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