Texas Instruments UC3854B
ADVANCED HIGH-POWER FACTOR PREREGULATOR
| Part No. | UC3854B |
|---|---|
| Datasheet | UC3854B Download |
| Manufacturer |  Texas Instruments |
| Description | ADVANCED HIGH-POWER FACTOR PREREGULATOR |
| Buy | Stock & Price |
FEATURES
1● 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 mV VAC Offset (Eliminates External Resistor), 0 V to 5 V Multout Common-Mode Range
● VREF GOOD Comparator
● Faster and Improved Accuracy ENABLE Comparator
● UVLO Options (16 V/10 V or 10.5 V/10 V)
● 300-µA Start-Up Supply Current BLOCK DIAGRAM VCC (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 compatible 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 by shaping the ac input line current waveform to correspond to the ac input line voltage.
