FAN4800I − Power Factor Correction (PFC) and PWM Controller Combo

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Obsolete as of 12-Mar-2013

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 capacitors, 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 requirements 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 section 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.

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Product Status/Packaging

Product Product & Eco Status Replacement Part Number Packaging & Packing Info **Package Marking Convention Qualification Support Compliance Certificates
2 FAN4800IN_G Obsolete as of 12-Mar-2013
Green as of Jun 2010
FAN4800AUN
 Details
3.3 x 6.3 x 19.18mm
RAIL

Line 1:$Y (Fairchild logo)
&Z (Plant Code)
&4 (4-Digit Date Code)
&K
Line 2:FAN4800IN
RƟJA :  80  °C/W
Moisture Sensitivity Level (MSL) :  NA  
Max Reflow Temp :  NA  
2 FAN4800IN Obsolete as of 14-Sep-2011
ROHS Compliant
FAN4800AUN
 Details
3.3 x 6.3 x 19.18mm
RAIL

Line 1:$Y (Fairchild logo)
&Z (Plant Code)
&4 (4-Digit Date Code)
&K
RƟJA :  80  °C/W
Moisture Sensitivity Level (MSL) :  NA  
Max Reflow Temp :  NA  

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 package


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