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FAN4803 데이터시트(PDF) 1 Page - Fairchild Semiconductor |
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FAN4803 데이터시트(HTML) 1 Page - Fairchild Semiconductor |
1 / 12 page www.fairchildsemi.com REV. 1.2.3 11/2/04 Features • Internally synchronized PFC and PWM in one 8-pin IC • Patented one-pin voltage error amplifier with advanced input current shaping technique • Peak or average current, continuous boost, leading edge PFC (Input Current Shaping Technology) • High efficiency trailing-edge current mode PWM • Low supply currents; start-up: 150µA typ., operating: 2mA typ. • Synchronized leading and trailing edge modulation • Reduces ripple current in the storage capacitor between the PFC and PWM sections • Overvoltage, UVLO, and brownout protection • PFC VCCOVP with PFC Soft Start General Description The FAN4803 is a space-saving controller for power factor corrected, switched mode power supplies that offers very low start-up and operating currents. Power Factor Correction (PFC) offers the use of smaller, lower cost bulk capacitors, reduces power line loading and stress on the switching FETs, and results in a power supply fully compli- ant to IEC1000-3-2 specifications. The FAN4803 includes circuits for the implementation of a leading edge, average current “boost” type PFC and a trailing edge, PWM. The FAN4803-1’s PFC and PWM operate at the same frequency, 67kHz. The PFC frequency of the FAN4803-2 is automatically set at half that of the 134kHz PWM. This higher frequency allows the user to design with smaller PWM components while maintaining the optimum operating frequency for the PFC. An overvoltage comparator shuts down the PFC section in the event of a sudden decrease in load. The PFC section also includes peak current limiting for enhanced system reliability. Block Diagram ISENSE 3 VEAO 4 VDC 5 ILIMIT 6 GND 2 PWM OUT 8 PFC OUT 1 – + – + COMP COMP 35 µA 16.2V 17.5V VCC + – COMP + – –1V SOFT START PFC/PWM UVLO DUTY CYCLE LIMIT OSCILLATOR PFC – 67kHz PWM – 134kHz VREF VREF 1.2V 26k 40k M1 R1 C1 30pF M2 M7 M3 M4 M6 PWM CONTROL LOGIC – + 1.5V DC ILIMIT PFC ILIMIT PWM COMPARATOR VCC OVP PFC OFF ONE PIN ERROR AMPLIFIER LEADING EDGE PFC TRAILING EDGE PWM + – COMP 7V + – COMP –1 –4 REF VCC 7 PFC CONTROL LOGIC FAN4803 8-Pin PFC and PWM Controller Combo |
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