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WS3412 Datasheet(PDF) 6 Page - Shenzhen Winsemi Microelectronics Co., Ltd |
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WS3412 Datasheet(HTML) 6 Page - Shenzhen Winsemi Microelectronics Co., Ltd |
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6 / 8 page  www.winsemi.com Tel : 0755-82506288 Fax : 0755-82506299 6/8 WS3412 Product Description WIN SEM I M ICROELECTRON ICS WIN SEM I M ICROELECTRON ICS WIN SEM I M ICROELECTRON ICS WIN SEM I M ICROELECTRON ICS WIN SEM I M ICROELECTRON ICS The WS3412 uses the patent source driver structure. The typical operation current is as low as 200uA, the auxiliary winding is not need. So the system design is simple and the cost is low. WS3412 will automatic detect the output voltage when enters hiccup mode; and will re-enter the normal working state when the output voltage is lower than Vovp. Output Output Output Output Open(Short) Open(Short) Open(Short) Open(Short) protection protection protection protection Output open/short protection is integrated inside WS3412. Once output open/short circuit is detected, the system will automatic enter hiccup mode until the protection signal disappear. Over Over Over Over Temperature Temperature Temperature Temperature Automatic Automatic Automatic Automatic adjustment adjustment adjustment adjustment of of of of output output output output current current current current WS3412 has over temperature regulating function, gradually reducing the output current when the power is over temperature, so as to control the output power and the temperature rise, keeping the power temperature in a setting value in order to improving the reliability of the system. The starting regulation temperature is 135℃. Input Input Input Input Filter Filter Filter Filter Capacitor Capacitor Capacitor Capacitor In order to obtain high PF value, the input capacitor can not be too large. 10-100nF is recommended. Power Power Power Power Factor Factor Factor Factor Correction Correction Correction Correction Active PFC control circuit is integrated in WS3412, which can get high PF value and low THD. PCB PCB PCB PCB Design Design Design Design The following guidelines should be followed in WS3412 PCB layout: Bypass Capacitor: The bypass capacitor on VCC pin should be as close as possible to the VCC and GND pins. Ground Path: The power ground path for current sense should be short, and the power ground path should be separated from small signal ground path before the negative node of the bulk capacitor. The Area of Power Loop: The area of power loop should be as small as possible to reduce EMI radiation. And the controller should be placed away from the heat generator, such as the power diode. |
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Similar Description - WS3412 |
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