ML4800 − Power Factor Correction (PFC) and PWM Controller Combo

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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 Detec™ function to help ensure that no unsafe conditions will result from single component failure in the PFC. Gate-drivers with 1A capabilities minimize the need for external driver circuits. Low power requirements improve efficiency and reduce component costs.An over-voltage comparator 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 can be operated in current or voltage mode, at up to 250kHz, and includes an accurate 50% duty cycle limit to prevent transformer saturation.

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Product Status/Pricing/Packaging

Product Product & Eco Status *Pricing Packaging & Packing Info **Package Marking Convention Qualification Support Compliance Certificates
1 ML4800CSX Not recommended for new design as of 03-Nov-2010
Green as of Feb 2010
N/A  Details
1.474 x 3.912 x 9.906mm
TAPE REEL

Line 1:$Y (Fairchild logo)
&Z (Plant Code)
&2 (2-Digit Date Code) &K
Line 2:ML4800CS
RƟJA :  80  °C/W
Moisture Sensitivity Level (MSL) :  1  
Max Reflow Temp :  260  
0 ML4800CP Full Production
Green as of Mar 2011
$2.81  Details
3.3 x 6.3 x 19.18mm
RAIL

Line 1:$Y (Fairchild logo)
&Z (Plant Code)
&4 (4-Digit Date Code)
&K
Line 2:ML4800CP
RƟJA :  80  °C/W
Moisture Sensitivity Level (MSL) :  NA  
Max Reflow Temp :  NA  
1 ML4800ISX Not recommended for new design as of 03-Nov-2010
Green as of Feb 2010
N/A  Details
1.474 x 3.912 x 9.906mm
TAPE REEL

Line 1:$Y (Fairchild logo)
&Z (Plant Code)
&2 (2-Digit Date Code) &K
Line 2:ML4800IS
RƟJA :  80  °C/W
Moisture Sensitivity Level (MSL) :  1  
Max Reflow Temp :  260  
Show discontinued variants ...

Features

  • Internally synchronized leading-edge PFC and trailing-edgePWM in one IC
  • TriFault Detect™ for UL1950 compliance andenhanced safety
  • Slew rate enhanced transconductance error amplifierfor ultra-fast PFC response
  • Low power: 200µA startup current, 5.5mA operatingcurrent
  • Low total harmonic distortion, high PF
  • Reduced ripple current in storage capacitor betweenPFC and PWM sections
  • Average current, continuous boost leading edge PFC
  • PWM configurable for current-mode or voltage modeoperation
  • Current fed gain modulator for improved noise immunity
  • Overvoltage and brown-out protection, UVLO, and softstart

Applications

  • AC-DC Merchant Power Supply

Application Notes



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