FAN4800CU: Power Factor Controller (PFC) CCM + PWM Controller, Line Sagging Protection
Description: The highly integrated FAN4800CU parts are speciall...
The highly integrated FAN4800CU parts are specially designed for power supplies that consist of boost PFC and PWM. They require very few external components to achieve versatile protections and compensation. They are available in 16-pin DIP and SOP packages.
The PWM can be used in current or Voltage Mode. In Voltage Mode, feed-forward from the PFC output bus can reduce secondary output ripple. To evaluate FAN4800AU/CU for replacing existing FAN4800C, FAN4800CS, old version FAN4800 and ML4800 boards, six things must be completed before the fine-tuning procedure:
1.Change RAC resistor from the old value to a higher resistor value: 6 MΩ to 8 MΩ.
2.Change RT/CT pin from the existing values to RT=6.8 kΩ and CT=1000 pF to have fPFC=64 kHz and fPWM=64 kHz.
3.The VRMS pin needs to be 1.224 V at VIN=85 VAC for universal input application with line input from 85 VAC to 270 VAC.
4.Change ISENSE pin filter from the exiting values to RFilter=51 Ω and CFilter=0.01 µF for higher bandwidth.
5.At full load, the average VVEA must be ~4.5 V and ripple on VVEA needs to be less than 400 mV.
6.For the SS pin, the soft-start current has been reduced to half the FAN4800 capacitor.
Pin-to-Pin Compatible with ML4800 and FAN4800 and CM6800 and CM6800A
PWM Configurable for Current-mode or Feed-forward Voltage-Mode Operation
Internally Synchronized Leading-Edge PFC and Trailing-Edge PWM in one IC
Low Operating Current
Innovative Switching-Charge Multiplier Divider
Average-Current-Mode for Input-Current Shaping
PFC Over-Voltage and Under-Voltage Protections
PFC Feedback Open-Loop Protection
Cycle-by-Cycle Current Limiting for PWM
Power-On Sequence Control and Soft-Star
Interleaved PFC/PWM Switching
FAN4801/02/02L Improve Efficiency at Light Load
fRTCT=4•fPFC=4•fPWM for FAN4800A and FAN4801
fRTCT=4•fPFC=2•fPWM for FAN4800C and FAN4802/02L
Technical Documentation & Design Resources
Availability and Samples
Compliance: Pb-free Halide free
Description: Power Factor Controller (PFC) CCM + PWM Controller, Line Sagging Protection
Package Type: SOIC-16
Package Case Outline: 751BG
Container Type: REEL
Container Qty: 2500
fSW Typ (kHz):
VCC Max (V):
Drive Cap. (mA):
470 / 550