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SG6846G Datasheet(PDF) 3 Page - Fairchild Semiconductor |
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SG6846G Datasheet(HTML) 3 Page - Fairchild Semiconductor |
3 / 14 page © 2008 Fairchild Semiconductor Corporation www.fairchildsemi.com SG6846G • Rev. 1.0.0 3 Marking Information Figure 3. Top Mark Pin Configuration Figure 4. Pin Configuration Pin Definitions Pin # Name Function Description 1 GND Ground Ground. 2 FB Feedback The signal from the external compensation circuit is fed into this pin. The PWM duty cycle is determined in response to the signal from this pin and the current-sense signal from pin 6. 3 VIN Line-voltage Detection Line-voltage detection is used for brownout protection with hysteresis. Constant output power limit over universal AC input range is also achieved using this pin. Add a low-pass filter to filter out line ripple on the bulk capacitor. 4 RI Reference Setting A resistor from the RI pin to ground generates a reference current source that determines the switching frequency. Increasing the resistance reduces the switching frequency. Using a 26kΩ resistor results in a 65kHz switching frequency. 5 RT Temperature Detection For over-temperature protection, an external NTC thermistor is connected from this pin to the GND pin. The impedance of the NTC decreases at high temperatures. Once the voltage of the RT pin drops below a threshold, PWM output is disabled. 6 SENSE Current Sense Current sense. The sensed voltage is used for peak-current-mode control and cycle-by-cycle current limiting. If the switching current is higher than OCP threshold and lasts for 110ms, SG6846G turns off immediately. This two-level OCP feature is especially suitable for SMPS with surge current output. 7 VDD Power Supply Power supply. If an open-circuit failure occurs in the feedback loop, the internal protection circuit disables PWM output as long as VDD exceeds a threshold. 8 GATE Driver Output The totem-pole output driver for the power MOSFET. It is internally clamped below 18V. : Fairchild Logo Z: Plant Code X: Year Code Y: Week Code TT: Die Run Code F: L = OCP Latch T: Package Type, S = SOP P: Y = Green Compound M: Manufacturing Flow Code |
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