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FAN4800IN_G Datasheet(PDF) 2 Page - Fairchild Semiconductor |
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FAN4800IN_G Datasheet(HTML) 2 Page - Fairchild Semiconductor |
2 / 19 page © 2005 Fairchild Semiconductor Corporation www.fairchildsemi.com FAN4800 Rev. 1.0.6 2 Block Diagram Figure 1. Internal Block Diagram RAMP2 V FB V REF RAMP1 20 μA OSCILLATOR 2.25V 4 3 15 DUTY CYCLE LIMIT 2 POWER FACTOR CORRECTOR 8 GAIN MODULATOR V FB 7.5V REFERENCE 7 S R Q S R Q I EAO V EAO PFC OUT S R Q UVLO SS DC I LIMIT PWM OUT V CC PULSE WIDTH MODULATOR V CC 0.9V 2.78V -1V GND 6 5 9 10 11 12 14 0.3V Low Power Detector V CC TRI-FAULT V CC OVP 350 PWM CMP SS CMP S R Q PFC OVP PFC CMP PWM DUTY 350 CLK PFC OUT PWM OUT 13 1 16 3.5k 3.5k 2.5V I AC I SENSE V RMS V DC 0.5V 17.9V V IN OK 1.0V DC I LIMIT PFC I LIMIT V CC V REF FAN4800 Rev.02 |
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