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TS19340CS14 bảng dữ liệu(PDF) 7 Page - Taiwan Semiconductor Company, Ltd |
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TS19340CS14 bảng dữ liệu(HTML) 7 Page - Taiwan Semiconductor Company, Ltd |
7 / 9 page TS19340CS14 Taiwan Semiconductor 7 Version: B1705 APPLICATION INFORMATION (CONTINUE) Pin Detail Pin 5: PWM The pin is for PWM dimming function control. The pin should be connected to internal 5V reference voltage when using linear dimming function. Recommend operation frequency range from 100Hz to 10kHz. The LED current vs. PWM duty ratio is shown as a formula following: ) ( _ _ A R 0.2 Ratio Duty PWM I S LED(PWM) × = Pin 6 : N/C No connection. Pin 7: GND GND is the reference node of internal circuit. Pin 8: COM The COM pin is for PWM pulse filter. The PWM duty ratio will be converted to 3.2V (Duty=100%) ~ 0V (Duty=0%). A suitable capacitor should be connected between the COM and ground. Pin 9: SWO The pin is an open drain output of the comparator for LED current cut-off function. The SWO pin will be pulled low when the LED current is cut-off. Pin 10: N/C No connection. Pin 11: PHO The PHO pin is for transferring secondary-side voltage/current signal for the primary-side controller. It is an open drain output of the two internal OP-AMPs for an external photo coupler. A capacitor and a resistor in series should be connected between PHO and FB for constant voltage control, and a capacitor and a resistor in series should be connected between PHO and VSEN for constant current control. Pin 12: VSEN The VSEN pin is for LED constant current control. The VSEN reference voltage will be adjusted by the PWM/CCH/CCL setting. The illustration is shown in Figure 5 and Figure 6. The maximum LED Current is in the formula as follows: ) ( A R 0.2 I S LED(max) = Pin 13: FB The FB pin is for LED constant voltage control. The FB reference voltage will be 2.53V when the LED current is not cut-off, and it will be 1.21V when the LED current is cut-off Pin 14: VCC Power supply for the controller during normal operation. The controller will start up when VCC reaches 12V (typical) and will shut-down when VCC voltage is below 7.6V (typical). A decoupling capacitor should be connected between the VCC and GND pin as close as possible. |
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