ML4800

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.

VCC .............................................................................................. 18V
ISENSE Voltage ................................................. -5V to 0.7V
Voltage on Any Other Pin ...... GND - 0.3V to VCCZ + 0.3V
IREF ........................................................................................... 10mA
IAC Input Current .................................................... 10mA
Peak PFC OUT Current, Source or Sink ....................... 1A
Peak PWM OUT Current, Source or Sink .................... 1A
PFC OUT, PWM OUT Energy Per Cycle ................... 1.5J
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 ML4800 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 IEC1000-3-2 specification. Intended as a BiCMOS version of the industry-standard ML4824, the ML4800 includes circuits for the implementation of leading edge, average current, "boost" type power factor correction and a trailing edge, pulse width modulator (PWM). It also includes a TriFault Detect™ function to help ensure that no unsafe conditions will result from single component failure in the PFC. Gate-drivers of ML4800 with 1A capabilities minimize the need for external driver circuits. Low power requirements improve efficiency and reduce component costs.

An over-voltage comparator of ML4800 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 of ML4800 can be operated in current or voltage mode, at up to 250kHz, and includes an accurate 50% duty cycle limit to prevent transformer saturation.