MFG:FAIRCHILD Package Cooled:SOP-8 D/C:05+
MFG: FAIRCHILD
Package Cooled: SOP-8
D/C: 05+
Description: The ML4803 is a space-saving controller for power factor corrected, switched mode power supplies that ...
The ML4803 is a space-saving controller for power factor corrected, switched mode power supplies that offers very low start-up and operating currents.
Power Factor Correction (PFC) offers the use of smaller, lower cost bulk capacitors, reduces power line loading and stress on the switching FETs, and results in a power supply fully compliant to IEC1000-3-2 specifications. The ML4803 includes circuits for the implementation of a leading edge, average current "boost" type PFC and a trailing edge, PWM.
The ML4803-1's PFC and PWM operate at the same frequency, 67kHz. The PFC frequency of the ML4803-2 is automatically set at half that of the 134kHz PWM. This higher frequency allows the user to design with smaller PWM components while maintaining the optimum operating frequency for the PFC. An overvoltage comparator shuts down the PFC section in the event of a sudden decrease in load. The PFC section also includes peak current limiting for enhanced system reliability.
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.
| Parameter | Min | Max | Unit |
| ICC Current (average) | 40 | mA | |
| VCC MAX | 18.3 | V | |
| ISENSE Voltage | -5 | 1 | V |
| Voltage on Any Other Pin | GND 0.3 | VCC + 0.3 |
V |
| Peak PFC OUT Current, Source or Sink | 1 | A | |
| Peak PWM OUT Current, Source or Sink | 1 | A | |
| PFC OUT, PWM OUT Energy Per Cycle | 1.5 | µJ | |
| Junction Temperature | 150 | °C | |
| Storage Temperature Range | -65° | 150 | °C |
| Lead Temperature (Soldering, 10 sec) | 260 | °C | |
| Thermal Resistance (JA) Plastic DIP Plastic SOIC |
110 160 |
°C/W °C/W |
ML4803
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