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FAN4800IMX Datasheet(PDF) 1 Page - Fairchild Semiconductor |
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FAN4800IMX Datasheet(HTML) 1 Page - Fairchild Semiconductor |
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1 / 20 page  © 2005 Fairchild Semiconductor Corporation www.fairchildsemi.com November 2006 FAN4800 Rev. 1.0.5 FAN4800 Low Start-Up Current PFC/PWM Controller Combos Features Low start-up current (100µA typical) Low operating current (2.5mA typical) Low total harmonic distortion, high power factor Pin-compatible upgrade for the ML4800 Average current, continuous or discontinuous boost, leading-edge PFC Slew rate enhanced transconductance error amplifier for ultra-fast PFC response Internally synchronized leading edge PFC and trailing- edge PWM Reduction of ripple current in the storage capacitor between the PFC and PWM sections PWM configurable for current-mode or voltage-mode operation Additional folded-back current limit for PWM section 20V BiCMOS process VIN OK guaranteed turn-on PWM at 2.25V VCC OVP comparator, low-power detect comparator Current-fed gain modulator for improved noise immunity Brownout control, over-voltage protection, UVLO, soft-start, and reference OK Available in 16-DIP, 16-SOIC (wide) packages Applications Desktop PC Power Supply Internet Server Power Supply Uninterruptible Power Supply (UPS) Battery Charger DC Motor Power Supply Monitor Power Supply Telecom System Power Supply Distributed Power Description The FAN4800 is a controller for power-factor-corrected, switched-mode power supplies. Power Factor Correction (PFC) allows the use of smaller, lower-cost bulk capaci- tors, reduces power line loading and stress on the switching FETs, and results in a power supply that fully complies with IEC-1000-3-2 specifications. Intended as a BiCMOS version of the industry-standard ML4800, the FAN4800 includes circuits for the implementation of leading edge, average current, boost-type power factor correction, and a trailing-edge Pulse Width Modulator (PWM). A gate driver with 1A capabilities minimizes the need for external driver circuits. Low-power require- ments improve efficiency and reduce component costs. An over-voltage comparator shuts down the PFC section in the event of a sudden decrease in load. The PFC sec- tion also includes peak current limiting and input voltage brownout protection. The PWM section can be operated in current or voltage mode, at up to 250kHz, and includes an accurate 50% duty cycle limit to prevent transformer saturation. The FAN4800 includes a folded-back current limit for the PWM section to provide short-circuit protection. Ordering Information 16-PDIP 16-SOIC Part Number Operating Temp. Range Pb-Free Package Packing Method Marking Code FAN4800IN -40°C to +125°C Yes 16-PDIP Rail FAN4800 FAN4800IM -40°C to +125°C Yes 16-SOIC Rail FAN4800 FAN4800IMX -40°C to +125°C Yes 16-SOIC Tape & Reell FAN4800 |
Similar Part No. - FAN4800IMX |
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