UCC3818A BiCMOS Power Factor Preregulator | TI.com

UCC3818A (ACTIVE)

BiCMOS Power Factor Preregulator

 

Description

The UCC3817A and the UCC3818A family provides all the functions necessary for active power factor corrected preregulators. The controller achieves near unity power factor by shaping the ac input line current waveform to correspond to that of the ac input line voltage. Average current mode control maintains stable, low distortion sinusoidal line current.

Designed in Texas Instrument’s BiCMOS process, the UCC3817A/UCC3818A offers new features such as lower start-up current, lower power dissipation, overvoltage protection, a shunt UVLO detect circuitry, a leading-edge modulation technique to reduce ripple current in the bulk capacitor and an improved, low-offset (±2 mV) current amplifier to reduce distortion at light load conditions.

The UCC3817A/18A family of PFC Controllers is directly pin for pin compatible with the UCC3817/18 family of devices. Only the output stage of UCC3817A family has been modified to allow use of a smaller external gate drive resistor values. For some power supply designs where an adequately high enough gate drive resistor can not be used, the UCC3817A/18A family offers a more robust output stage at the cost of increasing the internal gate resistances. The gate drive of the UC3817A/18A family however remains strong at ±1.2 A of peak current capability.

UCC3817A offers an on-chip shunt regulator with low start-up current, suitable for applications utilizing a bootstrap supply. UCC3818A is intended for applications with a fixed supply (VCC). Both devices are available in the 16-pin D, N and PW packages.

Features

  • Controls Boost Preregulator to Near-Unity Power Factor
  • Limits Line Distortion
  • World Wide Line Operation
  • Overvoltage Protection
  • Accurate Power Limiting
  • Average Current Mode Control
  • Improved Noise Immunity
  • Improved Feed-Forward Line Regulation
  • Leading Edge Modulation
  • 150-µA Typical Start-Up Current
  • Low-Power BiCMOS Operation
  • 12-V to 17-V Operation
  • Frequency Range of 6 kHz to 220 kHz

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Parametrics Compare all products in Power factor correction (PFC) controllers

 
Device type
Control method
UVLO thresholds on/off (V)
Operating supply (Max) (V)
Operating supply current (mA)
Operating temperature range (C)
Rating
Features
Package Group
Package size: mm2:W x L (PKG)
UCC3818A UCC3817A UCC3819A
Single-phase PFC     Single-phase PFC     Single-phase PFC    
CCM     CCM     CCM    
10.5/10     16/10     10.2/9.7    
18     18     17    
4     4     4    
0 to 70     0 to 70     0 to 70    
Catalog     Catalog     Catalog    
< 150W Applications
> 750W Applications
Average Current Mode
Enable
OVP    
> 750W Applications
Average Current Mode
Enable
OVP    
Average Current Mode
Enable
OVP    
PDIP | 16
SOIC | 16
TSSOP | 16    
PDIP | 16
SOIC | 16    
SOIC | 16    
See datasheet (PDIP)
16SOIC: 59 mm2: 6 x 9.9 (SOIC | 16)
16TSSOP: 22 mm2: 4.4 x 5 (TSSOP | 16)    
See datasheet (PDIP)
16SOIC: 59 mm2: 6 x 9.9 (SOIC | 16)    
16SOIC: 59 mm2: 6 x 9.9 (SOIC | 16)