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TS19702 Folha de dados(PDF) 5 Page - Taiwan Semiconductor Company, Ltd |
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TS19702 Folha de dados(HTML) 5 Page - Taiwan Semiconductor Company, Ltd |
5 / 9 page TS19702 High Power Factor Corrector LED Driver 5/9 Version: A12 Application Information (Continue) OCP (Over Current Protection) The TS19702 has an over current protection function on CS pin. An internal circuit detects the current level, when the current is larger than a threshold level, the gate output will keep on low level. Then VCC decreases below UVLO off level, the controller resets again. OVP (Over Voltage Protection) on VCC To prevent the LED driver from being damaged, the TS19702 is implemented an OVP function on VCC. When the VCC voltage is higher than the OVP threshold voltage 28V, the output gate driver circuit will be shut down immediately to stop the switching of power MOSFET. The VCC pin OVP function is an auto recovery type protection (latch off type optional). If the OVP condition happens, the pulses will be stopped and never recovery unless the VCC pin voltage is down to the UVLO off level. The TS19702 is working in an auto-recovery mode as shown in below figure Gate Clamp/Soft Driving Driver is clamped to 15V by an internal clamping circuit. Those damages usually come from undesired over-voltage gate signals. Under the conditions listed below, the gate output will turn off immediately to protect the power circuit. The TS19702 also has soft driving function to minimize EMI. Over Temperature Protection/Dimming Function The typical application for DIM pin is shown in above Fig. The NTC thermistor is setting as an external OTP protection. In the DIM pin, there is one comparator for latch-off mode protection. While the voltage on this pin is lower than 0.3V, the TS19702 will shut down. When the voltage is in the range of 0.3 to 3.0V, the TS19702 is operating on the linear dimming range. While the voltage is higher than 3.0V, the TS19702 is operating on the normal status. It also could let this Pin open when the function is not required for the user. |
Nº de peça semelhante - TS19702_14 |
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Descrição semelhante - TS19702_14 |
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