UC2855B

所属类别：ACDC-和-DCDC-电源
产品名称：高性能功率因子前置稳压器
厂商：TI/BB
生产批号：10+
封装：20PDIP, 20SOIC
库存状态：有库存
库存量：5000
最低订购量：1
详细资料：

Product Introduction

The UC3855A/B provides all the control functions required for high power, high frequency PFC boost converters. The average current mode control method allows ramp compensation without the need for stable, low-distortion AC line current programming. In addition, the UC3855 uses aggressive snub or zero voltage (zero voltage conversion technology) to greatly reduce recovery diode and MOSFET conduction losses, resulting in lower EMI emissions and higher efficiency. Boost converters with switching frequencies up to 500kHz are now monetized and require only an additional small MOSFET, diode and inductive resonance soft switch boost diode and switch. Average current sensing can be used in simple resistive parallel or with a current-sense transformer.

characteristic

Near-boost PWM to control the unit power factor
Fixed frequency average current mode controls line current distortion to a minimum
Built-in active buffer (zero voltage) allows operation up to 500kHz, improving EMI and efficiency
Inductive current synthesizers can be single-current transformers for improved efficiency and noise-tolerant current sensing
Accurate analog multiplier band line compensation allows universal input voltage operation
High bandwidth (5MHz), low offset current amplifier
Overvoltage and overcurrent protection
Two UVLO threshold options
150 &mirco; a starting power supply current typical
7.5V Reference Accuracy 1%

parameter

	UC2855B
On/off of undervoltage lockout threshold (5)	10.5/10
Working power supply (max) (five)	20
Starting Current (mA)	0.15
Operating Supply Current (mA)	17
Vref (V)	7.5
Vref's Thor (%)	1.5
Duty Cycle (Max) (%)	95
Actual operating frequency (max) (MHz)	0.5
Pin/Pack	20PDIP，20SOIC

ICs related to UC2855B include:

Model	Manufacturers	lot number	encapsulation	illustrate
UC2855BDWTR	TI	00+	SOP	Brand new original
UC2855BDW	UNITRODE	00+	SOP-20	Brand new original
UC2855BDW/ADW	TEXAS	04+	SOP	Brand new original
UC2855B	TI/BB	10+	20PDIP, 20SOIC	High-performance power factor pre-regulator

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