UC3854B
FEATURES
- Controls Boost PWM to Near-Unity Power Factor
- Limits Line Current Distortion To <3%
- World-Wide Operation Without Switches
- Accurate Power Limiting
- Fixed-Frequency Average Current-Mode
Control
- High Bandwidth (5 MHz), Low-Offset Current Amplifier
- Integrated Current- and Voltage-Amplifier Output Clamps
- Multiplier Improvements: Linearity, 500 m V VAC Offset (Eliminates External Resistor), 0 V to 5 V Multout mon-Mode Range
- VREF GOOD parator
- Faster and Improved Accuracy ENABLE parator
- UVLO Options (16 V/10 V or 10.5 V/10 V)
- 300-µA Start-Up Supply Current
BLOCK DIAGRAM
(A) 16 V / 10 V (B) 10.5 V / 10 V ENA 10
2.65 V / 2.15 V
3V
VSENSE 11
IAC 6
VRMS 8 SS 13
14 µA
VAO 7
MOUT 5
A B X2 C IMOUT + A C B
DESCRIPTION
The UC3854A/B products are pin patible enhanced versions of the UC3854. Like the UC3854, these products provide all of the functions necessary for active power factor corrected preregulators. The controller achieves near unity power factor...
