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SG6859ATZ Datasheet(PDF) 4 Page - Fairchild Semiconductor |
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SG6859ATZ Datasheet(HTML) 4 Page - Fairchild Semiconductor |
4 / 13 page © 2007 Fairchild Semiconductor Corporation www.fairchildsemi.com SG6859A • Rev. 1.0.3 4 Pin Configurations Figure 4. SSOT-6 Pin Configuration Figure 5. DIP-8 Pin Configuration Pin Definitions DIP Pin # SSOT Pin # Name Description 1 6 GATE The totem-pole output driver for driving the power MOSFET. 2 5 VDD Power supply 3 NC No connection 4 4 SENSE Current sense. This pin senses the voltage across a resistor. When the voltage reaches the internal threshold, PWM output is disabled. This activates over-current protection. This pin also provides current amplitude information for current-mode control. 5 3 RI A resistor connected from the RI pin to ground generates a constant current source used to charge an internal capacitor and determine the switching frequency. Increasing the resistance reduces the amplitude of the current source and the switching frequency. A 95kΩ resistor RI results in a 50μA constant current II and a 70kHz switching frequency. 6 NC No connection 7 2 FB Feedback. The FB pin provides the output voltage regulation signal. It provides feedback to the internal PWM comparator, so that the PWM comparator can control the duty cycle. 8 1 GND Ground |
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