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WS9445P Datasheet(PDF) 7 Page - List of Unclassifed Manufacturers |
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WS9445P Datasheet(HTML) 7 Page - List of Unclassifed Manufacturers |
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7 / 9 page  www.winsemi.com Tel : +86-755-8250 6288 Fax : +86-755-8250 6299 7/9 WS9445P Product Description WINSEMI MICROELECTRONICS WINSEMI MICROELECTRONICS WINSEMI MICROELECTRONICS WINSEMI MICROELECTRONICS WINSEMI MICROELECTRONICS 6 10 * * 67 . 7 120 Tovp Rovp （ KΩ） It is suggested that the open circuit protection voltage is set at or above 1.5 times maximum load voltage. Protection Function The WS9445P offers rich protection functions to improve the system reliability, including LED open/short protection, CS resistor short protection, VCC under voltage protection, thermal regulation. When the LED is open circuit, the system will trigger the over voltage protection and stop switching. When the LED short circuit is detected, the system works at low frequency and the CS pin turnoff threshold is reduced. So the system power consumption is very low. At some abnormal fault condition, such as CS resistor shorted or inductor saturation, the internal fast fault detection circuit will be triggered, the system stops switching immediately. After the system enters into faulty condition, the VCC voltage will decrease until it reaches the UVLO threshold, then the system will restart again. If the fault condition is removed, the system will recover to normal operation. Line Voltage Compensation The WS9445P integrates line voltage compensation function, which makes LED current remain unchanged in the range of full voltage with good line regulation and current accuracy. PCB Layout The following rules should be followed in WS9445P PCB layout: VCC Capacitor: The VCC capacitor should be as close as possible to the VCC Pin and GND pin. Ground Path: The power ground path for current sense resistor should be short, and the power ground path should be separated from small signal ground path before connecting to the negative node of the bulk capacitor. The Area of Power Loop: The area of main current loop should be as small as possible to reduce EMI radiation. And it should be away from diodes and other heating components. ROVP PIN: The ROVP resistor should be as close as possible to the ROVP Pin to increase its resistance to prevent from the interference. DRAIN PIN: The copper area of DRAIN pin can be increased for better thermal dissipation. And it should be away from CS/VCC and ROVP Pin. |
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