UC1855B

更新时间： 2024-11-25 22:41:51

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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中文翻译

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数据手册

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UC1855B 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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与UC1855B相关器件

型号	品牌	获取价格	描述	数据表
UC1855BJ	ROCHESTER	获取价格	1.5A POWER FACTOR CONTROLLER, 500kHz SWITCHING FREQ-MAX, CDIP16, CERAMIC, DIP-16
UC1855BL	TI	获取价格	1.5A POWER FACTOR CONTROLLER, 500kHz SWITCHING FREQ-MAX, CQCC20, CERAMIC, LCC-20
UC1855BN	TI	获取价格	1.5A POWER FACTOR CONTROLLER, 500kHz SWITCHING FREQ-MAX, PDIP16, PLASTIC, DIP-16
UC1855BQ	TI	获取价格	1.5A POWER FACTOR CONTROLLER, 500kHz SWITCHING FREQ-MAX, PQCC20, PLASTIC, LCC-20
UC1856	TI	获取价格	Improved Current Mode PWM Controller
UC1856_12	TI	获取价格	Improved Current Mode PWM Controller
UC1856J	TI	获取价格	Improved Current Mode PWM Controller
UC1856J883B	TI	获取价格	Improved Current Mode PWM Controller
UC1856L	TI	获取价格	Improved Current Mode PWM Controller
UC1856L20	TI	获取价格	Improved Current Mode PWM Controller

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