UCX854中文资料PDF规格书
UCX854规格书详情
1 Features
1• Control Boost PWM to 0.99 Power Factor
• Limit Line-Current Distortion to < 5
• World-Wide Operation Without Switches
• Feedforward Line Regulation
• Average Current-Mode Control
• Low Noise Sensitivity
• Low Startup Supply Current
• Fixed-Frequency PWM Drive
• Low-Offset Analog Multiplier and Divider
• 1-A Totem-Pole Gate Driver
• Precision Voltage Reference
2 Applications
• Offline AC-to-DC Converters
• Medical, Industrial, Telecom, and IT Power
Supplies
• Uninterruptible Power Supplies (UPS)
• Appliances and White Goods
3 Description
The UC1854 provides active-power factor correction
for power systems that otherwise would draw nonsinusoidal
current from sinusoidal power lines. This
device implements all the control functions necessary
to build a power supply capable of optimally using
available power-line current while minimizing linecurrent
distortion. To do this, the UC1854 contains a
voltage amplifier, an analog multiplier and divider, a
current amplifier, and a fixed-frequency PWM.
In addition, the UC1854 contains a power MOSFETcompatible
gate driver, 7.5-V reference, line
anticipator, load-enable comparator, low-supply
detector, and overcurrent comparator.
The UC1854 uses average current-mode control to
accomplish fixed-frequency current control with
stability and low distortion. Unlike peak current-mode,
average current control accurately maintains
sinusoidal line current without slope compensation
and with minimal response to noise transients.
The high reference voltage and high oscillator
amplitude of the UC1854 minimize noise sensitivity
while fast PWM elements permit chopping
frequencies above 200 kHz. The UC1854 is used in
single-phase and three-phase systems with line
voltages that vary from 75 V to 275 V and line
frequencies across the 50-Hz to 400-Hz range. To
reduce the burden on the circuitry that supplies power
to this device, the UC1854 features low starting
supply current.
These devices are available packaged in 16-pin
plastic and ceramic dual in-line packages, and a
variety of surface-mount packages.
供应商 | 型号 | 品牌 | 批号 | 封装 | 库存 | 备注 | 价格 |
---|---|---|---|---|---|---|---|
NICHICON/尼吉康 |
2022+ |
DIP |
112000 |
原厂代理 终端免费提供样品 |
询价 | ||
Nichicon |
21+ |
尼吉康专家 |
12000 |
专做尼吉康,只做尼吉康,尼吉康原厂搬运工! |
询价 | ||
NICHICON/尼吉康 |
23+ |
DIP-2 |
50000 |
全新原装正品现货,支持订货 |
询价 | ||
NICHICON/尼吉康 |
12.5X20 |
30475 |
一级代理原装正品,价格优势,支持实单! |
询价 | |||
NICHICON/尼吉康 |
DIP |
11200 |
原厂授权一级代理、全球订货优势渠道、可提供一站式BO |
询价 | |||
NICHICON/尼吉康 |
23+ |
DIP-2 |
20000 |
原装正品 欢迎咨询 |
询价 | ||
Nichicon |
23+ |
12.5×20 |
450000 |
Nichicon电容全系列在售 |
询价 | ||
尼吉康/NICHICON |
22+ |
DIP |
1000000 |
专营插件.贴片 电解电容 全新原装现货 |
询价 | ||
NHON/尼吉康 |
23+ |
NA/ |
3450 |
原厂直销,现货供应,账期支持! |
询价 | ||
NICHICON-尼吉康 |
24+25+/26+27+ |
车规铝电解电容 |
6418 |
一一有问必回一特殊渠道一有长期订货一备货HK仓库 |
询价 |