UC1855

更新时间： 2024-11-22 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

阅读下载

中文翻译

获取价格

数据手册

如果您发现信息不准确，欢迎纠错

UC1855 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

下载PDF

与UC1855相关器件

型号	品牌	获取价格	描述	数据表
UC1855A	TI	获取价格	High Performance Power Factor Preregulator
UC1855ADW	TI	获取价格	暂无描述
UC1855AJ	TI	获取价格	High Performance Power Factor Preregulator 20-CDIP -55 to 125
UC1855AL	ETC	获取价格	Power Factor Controller
UC1855AQ	TI	获取价格	暂无描述
UC1855B	TI	获取价格	High Performance Power Factor Preregulator
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

与UC1855相关文章

解析光耦仿真器：升级光耦合器技术的必要性
2024-11-18

36
英伟达新一代Blackwell GPU过热问题致交付延迟
2024-11-18

28
国产厂商思特威CMOS图像传感器芯片单月出货超1亿颗，技术创新引领行业发展
2024-11-14

56
台积电5nm和3nm产能利用率达100%，半导体行业景气度持续攀升
2024-11-14

53

产品中心

服务支持

精选活动

关于我们

帮助中心

UC1855

UC1855 数据手册

与UC1855相关器件

与UC1855相关文章

您还可以找

产品中心

服务支持

精选活动

关于我们

帮助中心

UC1855

UC1855 数据手册

与UC1855相关器件

与UC1855相关文章

您还可以找

您在本页遇到什么问题？