FAN4800A SMD SOP16

LCD power chip FAN4800 FAN4800A patchfa SMD SOP16

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 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