UC2855B

Manufacturer: UNITRODE

This datasheet includes multiple variants, all published together in a single manufacturer document.

Datasheet Details

Part number	UC2855B
Datasheet	UC2855B UC2855A Datasheet (PDF)
File Size	1.28 MB
Manufacturer	UNITRODE
Description	High Performance Power Factor Preregulator

The UC3855A/B provides all the control.

Controls Boost PWM to Near Unity
Fixed Frequency Average Current Mode Control Minimizes Line Current Distortion
Built-in Active Snubber (ZVT) allows Operation to 500kHz, improved EMI and Efficiency
Inductor Current Synthesizer allows Single Current Transformer Current Sense for Improved Efficiency and Noise Margin
Accurate Analog Multiplier with Line pensator allows for Universal Input Voltage Operation
High Bandwidth (5MHz), Low Offset Current Amplifier
Overvoltage and Overcurrent protection
Two UVLO Threshold Options
150µA Startup Supply Current Typical
Precision 1% 7.5V Reference

Part Number	Description
UC2855A	High Performance Power Factor Preregulator
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UC2852	High Power-Factor Preregulator
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UC2853A	High Power Factor Preregulator
UC2856	Improved Current Mode PWM Controller
UC2823	High Speed PWM Controller
UC2823A	High Speed PWM Controller
UC2823B	High Speed PWM Controller
UC2825	High Speed PWM Controller