UC3855BDW - TI

The pictures are for reference only, and the specific specifications can be found in the product manual.

Part No

UC3855BDW
Manufacturer

TI
ChipWorker Part#

CW12319063
Category

Power Management IC
Package

SOIC-20
Description

TEXAS INSTRUMENTS UC3855BDW PFC Controller IC, 15V to 35V & 17mA Supply, 15V Lockout, 95% Duty Cycle, 500kHz, SOIC-20
Documentation

Datasheet

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UC3855BDW Specifications

Attribute	Attribute Value

Part Number	UC3855BDW
Manufacturer	TI
ChipWorker Part#	CW12319063
Category	Power Management IC
Documentation	Datasheet
Mounting Style	Surface Mount
Number of Pins	20 Pin
Case/Package	SOIC-20
Frequency	500 kHz
Supply Voltage (DC)	15.0V (min)
Number of Outputs	2 Output
Number of Positions	20 Position
Switching Frequency	500 kHz
Duty Cycle	95 %
Maximum Duty Cycle	95 %
Operating Temperature (Max)	70 ℃
Operating Temperature (Min)	0 ℃
Supply Voltage	10.5V ~ 20V
Supply Voltage (Max)	35 V
Supply Voltage (Min)	15 V
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Size-Length	12.8 mm
Size-Width	7.52 mm
Size-Height	2.35 mm
Operating Temperature	0℃ ~ 70℃
Product Lifecycle Status	Active
Packaging	Tube
RoHS	RoHS Compliant
Lead-Free Status	Lead Free
REACH SVHC Compliance	No SVHC
REACH SVHC Compliance Edition	2015/06/15
ECCN Code	EAR99

Product Description

The UC3855BDW is a high-performance Power Factor Preregulator provides all the control features necessary for high power, high frequency PFC boost converters. The average current-mode control method allows for stable, low distortion AC line current programming without the need for slope compensation. In addition, it utilizes an active snubbing or zero voltage transition technique to dramatically reduce diode recovery and MOSFET turn-on losses, resulting in lower EMI emissions and higher efficiency. Boost converter switching frequencies up to 500kHz are now realizable, requiring only an additional small MOSFET, diode and inductor to resonantly soft switch the boost diode and switch. Average current sensing can be employed using a simple resistive shunt or a current sense transformer. Using the current sense transformer method, the internal current synthesizer circuit buffers the inductor current during the switch on-time and reconstructs the inductor current during the switch off-time.
Controls Boost PWM to Near unity power factor
Fixed frequency average current mode control minimizes line current distortion
Built-in active snubber (ZVT) allows operation to 500kHz, Improved EMI and efficiency
Accurate analog multiplier with line compensator allows for universal input voltage operation
Overvoltage and overcurrent protection
Precision 1% 7.5V Reference
Green product and no Sb/Br

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