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TS19452CS-RLG Datasheet(PDF) 4 Page - Taiwan Semiconductor Company, Ltd |
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TS19452CS-RLG Datasheet(HTML) 4 Page - Taiwan Semiconductor Company, Ltd |
4 / 7 page TS19452 AC/DC WLED Driver with Internal MOSFET Universal Switch Mode 4/7 Version: A12 Application Information (Continue) Where L is the inductance value, and CL is the coil capacitance. Charging and discharging this capacitance every switching cycle causes high-current spikes in the LED string. Therefore, connecting a small capacitor CO(~100nF) is recommended to bypass these spikes. Using an ultra-fast rectifier diode for D1 is recommended to achieve high efficiency and reduce the risk of false triggering of the current sense comparator. Using diodes with shorter reverse recovery time trr and lower junction capacitance CJ achieves better performance. The reverse voltage rating VR of the diode must be greater than the maximum input voltage of LED lamps. The total parasitic capacitance present at the Drain pin of the TS19452 can be calculated as: CP = CDRAIN + CPCB + CL + CJ When the switching MOSFET turns on, the capacitance CP is discharged into the Drain pin of the IC. The discharge current is limited to about 150mA typically. However, it may become lower at increased junction temperature. The duration of the leading edge current spike can be estimated as: TPSIKE = ((VIN x CP) / (ISAT)) + tr EMI Filter As with all off-line converters, selecting an input filter is critical to obtaining good EMI. A switching side capacitor, albeit of small value, is necessary in order to ensure low impedance to the high frequency switching currents of the converter. As a rule of thumb, this capacitor should be approximately 0.1~0.2µF/W of LED output power. |
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