CCM PFC + PWM Combination Controller

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Overview

The highly integrated FAN4800A/C and FAN4801/02/02L are specially designed for power supplies that consist of boost PFC and PWM. They require very few external components to achieve versatile protections / compensation. They are available in 16-pin DIP and SOP packages. The PWM can be used in either current or voltage mode. In voltage mode, feed-forward from the PFC output bus can reduce the secondary output ripple. Compared with older productions, ML4800 and FAN4800, FAN4800A/C and FAN4801/02/02L have lower operation current that save power consumption in external devices. FAN4800A/C and FAN4801/02/2L have accurate 49.9% maximum duty of PWM that makes the hold-up time longer. Brownout protection and PFC soft-start functions are not in ML4800 and FAN4800. To evaluate FAN4800A/C, FAN4801/02/02L for replacing existing FAN4800 and ML4800 boards, five things must be done before the fine-tuning procedure: 1. Change RAC resister from the old value to a higher resister: between 6MΩ to 8MΩ. 2. Change RT/CT pin from the existing values to RT=6.8KΩand CT=1000pF to have fPFC=64KHz, fPWM=64KHz. 3. VRMS pin needs to be 1.224V at VIN=85 VAC for universal input application from line input from 85VAC to 270 VAC. Both poles for the Vrms of FAN4801/02/02L don’t need to substantially slower than FAN4800; about 5 to 10 times. 4. At full load, the average VEA needs to ~4.5V and the ripple on the VEA needs to be less than 400mV. 5. Soft-Start pin, the soft-start current has been reduced to half from the FAN4800 capacitor.

  • AC-DC Merchant Power Supply - Desktop PC
  • AC-DC Merchant Power Supply
  • AC-DC Merchant Power Supply - Servers & Workstations
  • Desktop PC
  • Fully Configured Entry Level PC Server
  • PC Server
  • Server
  • Workstation
  • 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-Start
  • Brownout Protection
  • Interleaved PFC/PWM Switching
  • FAN4801/02/02L Improve Efficiency at Light Load
  • fRTCT=4
  • fPFC=4
  • fRTCT=4
  • fPWM for FAN4800A and FAN4801
  • fPWM for FAN4800C and FAN4802/02L
  • fPFC=2

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PFC Mode

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FAN4800AMY

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Obsolete

CAD Model

Pb

A

H

P

SOIC-16

3

260

REEL

2500

N

CCM

-

-

-

-

12

-

-

-

-

-

Price N/A

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FAN4800ANY

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CAD Model

Pb

A

H

P

PDIP-16

NA

0

TUBE

1500

N

CCM

-

-

-

-

12

-

-

-

-

-

Price N/A

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