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FSB117H 数据表(PDF) 4 Page - Fairchild Semiconductor |
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FSB117H 数据表(HTML) 4 Page - Fairchild Semiconductor |
4 / 18 page © 2011 Fairchild Semiconductor Corporation www.fairchildsemi.com FSB117H / FSB127H / FSB147H • Rev. 1.0.7 4 Pin Configuration Figure 3. Pin Configuration Pin Definitions Pin # Name Description 1 GND Ground. This pin internally connects to the SenseFET source and signal ground of the PWM controller. 2 VDD Supply voltage of the IC. Typically the holdup capacitor connects from this pin to ground. Rectifier diode in series with the transformer auxiliary winding connects to this pin to supply bias during normal operation. 3 FB Feedback. The signal from the external compensation circuit connects to this pin. The PWM duty cycle is determined by comparing the signal on this pin and the internal current-sense signal. 4 IPK Adjust peak current. Typically a resistor connects from this pin to the GND pin to program the current-limit level. The internal current source (50 µA) introduces voltage drop across the resistor, which determines the current limit level of pulse-by-pulse current limit. 5 HV Startup. Typically, resistors in series with diodes from the AC line connect to this pin to supply internal bias and to charge the external capacitor connected between the VDD pin and the GND pin during startup. This pin is also used to sense the line voltage for brownout protection and AC line disconnection detection. 6 Drain SenseFET drain. This pin is designed to directly drive the transformer. 7 8 F – Fairchild Logo Z – Plant Code X – 1-Digit Year Code Y – 1-Digit Week Code TT – 2-Digit Die Run Code T – Package Type (N: DIP) P – Y: Green Package M – Manufacture Flow Code |
类似零件编号 - FSB117H |
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类似说明 - FSB117H |
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