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Part Number: ML4803c
Description: The ML4803 is a space-saving controller for power factor corrected, switched mode power supplies that ...
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ML4803c
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General Description
ML4803c General Description
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.
ML4803c Maximum Ratings
ICC Current (average) ........................................... 40mA
VCC MAX ............................................................... 18.3V
ISENSE Voltage ................................................ -5V to 1V
Voltage on Any Other Pin ...... GND - 0.3V to VCC + 0.3V
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 ..................................................... 110°C/W
Plastic SOIC ................................................... 160°C/W
VCC MAX ............................................................... 18.3V
ISENSE Voltage ................................................ -5V to 1V
Voltage on Any Other Pin ...... GND - 0.3V to VCC + 0.3V
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 ..................................................... 110°C/W
Plastic SOIC ................................................... 160°C/W
ML4803c Features
Internally synchronized PFC and PWM in one 8-pin IC
Patented one-pin voltage error amplifier with advanced input current shaping technique
Peak or average current, continuous boost, leading edge PFC (Input Current Shaping Technology)
High efficiency trailing-edge current mode PWM
Low supply currents; start-up: 150A typ., operating: 2mA typ.
Synchronized leading and trailing edge modulation
Reduces ripple current in the storage capacitor between the PFC and PWM sections
Overvoltage, UVLO, and brownout protection
PFC VCCOVP with PFC Soft Start
Patented one-pin voltage error amplifier with advanced input current shaping technique
Peak or average current, continuous boost, leading edge PFC (Input Current Shaping Technology)
High efficiency trailing-edge current mode PWM
Low supply currents; start-up: 150A typ., operating: 2mA typ.
Synchronized leading and trailing edge modulation
Reduces ripple current in the storage capacitor between the PFC and PWM sections
Overvoltage, UVLO, and brownout protection
PFC VCCOVP with PFC Soft Start
ML4803c Connection Diagram
ML4803CP1
PDF/DataSheet Download
- Datasheet: ML4803CP1
- File Size: 136855 KB
- Manufacturer: FAIRCHILD [Fairchild Semiconductor]
- Click here to Download
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