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SG6846A Datasheet(PDF) 2 Page - Fairchild Semiconductor |
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SG6846A Datasheet(HTML) 2 Page - Fairchild Semiconductor |
2 / 13 page Product Specification Highly Integrated Green-Mode PWM Controller SG6846A © System General Corp. - 2 - www.sg.com.tw • www.fairchildsemi.com Version 1.1.1 (IAO33.0059.B1) September 26, 2007 MARKING DIAGRAMS PIN CONFIGURATION ORDERING INFORMATION Part Number OCP Latch Pb-Free Package SG6846ALSZ Yes 8-Pin SOP SG6846ACSZ (Preliminary) No 8-Pin SOP PIN DESCRIPTIONS Pin No. Symbol 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. The line-voltage detection is used for brownout protection with hysteresis. Constant output power limit over a universal AC input range is also achieved using this VIN pin. Consider adding 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 two thirds of the peak-current threshold for longer than 100ms and VDD is higher than 12V and lasts for 1700ms, over-current protection is activated. If an output short over-current also occurs and lasts for 100ms and VAUX is lower than 12V, SG6846A turns off immediately. This two-level OCP feature is especially suitable for SMPS with surge current output. It also has built-in 5ms soft-start time as switching frequency operates at 65KHz. 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 the threshold. 8 GATE Driver Output The totem-pole output driver for the power MOSFET, internally clamped below 18V. F: L=OCP Latch, C=OCP auto-recovery T: S=SOP P : Z=Lead Free Null=regular package XXXXXXXX: Wafer Lot Y: Year; WW: Week V: Assembly Location GATE VDD GND FB SG6846AFTP XXXXXXXXYWWV VIN SENSE RI RT |
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