UC3855B

更新时间： 2024-11-25 22:52:43

品牌	Logo	应用领域
德州仪器 - TI		稳压器
页数	文件大小	规格书
9页	429K
描述
High Performance Power Factor Preregulator

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UC3855B 数据手册

UC1855A/B

UC2855A/B

UC3855A/B

High Performance Power Factor Preregulator

FEATURES

DESCRIPTION

• Controls Boost PWM to Near Unity

Power Factor

The UC1855A/B 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 program-

ming without the need for slope compensation. In addition, the UC1855

utilizes an active snubbing or ZVT (Zero Voltage Transition technique) to

dramatically reduce diode recovery and MOSFET turn-on losses, result-

ing in lower EMI emissions and higher efficiency. Boost converter switch-

ing 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 us-

ing a simple resistive shunt or a current sense transformer. Using the cur-

rent 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. Improved signal to noise ratio

and negligible current sensing losses make this an attractive solution for

higher power applications.

• 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

Compensator allows for Universal

Input Voltage Operation

The UC1855A/B also features a single quadrant multiplier, squarer, and

divider circuit which provides the programming signal for the current loop.

The internal multiplier current limit reduces output power during low line

conditions. An overvoltage protection circuit disables both controller out-

puts in the event of a boost output OV condition.

• 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

Low startup supply current, UVLO with hysteresis, a 1% 7.5V reference,

voltage amplifier with softstart, input supply voltage clamp, enable com-

parator, and overcurrent comparator complete the list of features. Avail-

able packages include: 20 pin N, DW, Q, J, and L.

BLOCK DIAGRAM

UDG-94001-2

License Patent from Pioneer Magnetics. Pin numbers refer to DIL-20 J or N packages.

6/98

12 3 4 5 6 7...9

中文翻译

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UC3855B 替代型号

型号	品牌	替代类型	描述	数据表
UC2855B	TI	功能相似	High Performance Power Factor Preregulator

与UC3855B相关器件

型号	品牌	获取价格	描述	数据表
UC3855BDW	TI	获取价格	High Performance Power Factor Preregulator
UC3855BDWG4	TI	获取价格	High Performance Power Factor Preregulator
UC3855BDWTR	TI	获取价格	High Performance Power Factor Preregulator
UC3855BDWTRG4	TI	获取价格	High Performance Power Factor Preregulator
UC3855BJ	ETC	获取价格	Power Factor Controller
UC3855BL	ETC	获取价格	Power Factor Controller
UC3855BN	TI	获取价格	High Performance Power Factor Preregulator
UC3855BNG4	TI	获取价格	High Performance Power Factor Preregulator
UC3855BQ	ETC	获取价格	Power Factor Controller
UC3855BQTR	ETC	获取价格	Power Factor Controller

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