ML4841

Absolute maximum ratings are those values beyond which the device could be permanently damaged. Absolute maximum ratings are stress ratings only and functional device operation is not implied.
V_CC Shunt Regulator Current ................................. 55mA
I_SENSE Voltage .................................................. -3V to 5V
Voltage on Any Other Pin ...... GND - 0.3V to V_CCZ + 0.3V
I_REF ....................................................................... 20mA
I_AC Input Current .................................................. 10mA
Peak PFC OUT Current, Source or Sink ................ 500mA
Peak PWM OUT Current, Source or Sink .............. 500mA
PFC OUT, PWM OUT Energy Per Cycle .................. 1.5mJ
Junction Temperature ......................................... 150°C
Storage Temperature Range ..............65°C to 150°C
Lead Temperature (Soldering, 10 sec) ............... 260°C
Thermal Resistance (_JA)
Plastic DIP ....................................................... 80°C/W
Plastic SOIC ................................................... 105°C/W

The ML4841 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 IEC1000-2-3 specifications. The ML4841 includes circuits for the implementation of a leading edge, average current, "boost" type power factor correction, and a trailing edge, pulse width modulator (PWM).

The PFC frequency of the ML4841 is automatically set at half that of the PWM frequency generated by the internal oscillator. This technique allows the user to design with smaller output components while maintaining the optimum operating frequency for the PFC. An over-voltage comparator shuts down the PFC section in the event of a sudden decrease in load. The PFC section of ML4841 also includes peak current limiting and input voltage brown-out protection.