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产品信息
深圳市汇莱科技威科技有限公司 本着以“信誉为首,质量为优,公平交易,优质服务”的经营理念，潜心服务于电子行业, 与客户共同求发展,并且期待与你成为忠实的商贸伙伴!供应UCC2818DTR BiCMOS功率因数前置稳压器
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Controls Boost Preregulator to Near-Unity
Power Factor BiCMOS功率因数前置稳压器 BiCMOS功率因数前置稳压器 BiCMOS功率因数前置稳压器
Limits Line Distortion
World Wide Line Operation
Over-Voltage Protection
Accurate Power Limiting
Average Current Mode Control
Improved Noise Immunity
Improved Feed-Forward Line Regulation
Leading Edge Modulation
150-μA Typical Start-Up Current
Low-Power BiCMOS Operation
12-V to 17-V Operation
Frequency Range 6 kHz to 220 kHz
description
The UCCx817/18 family provides all the functions necessary for active power factor corrected preregulators.
The controller achieves near unity power factor by shaping the ac input line current waveform to correspond
to that of the ac input line voltage. Average current mode control maintains stable, low distortion sinusoidal line
current.
Designed in Texas Instrument’s BiCMOS process, the UCC2817/UCC2818 offers new features such as lower
start-up current, lower power dissipation, overvoltage protection, a shunt UVLO detect circuitry, a leading-edge
modulation technique to reduce ripple current in the bulk capacitor and an improved, low-offset (±2 mV) current
amplifier to reduce distortion at light load conditions.
block diagram
UDG-98182
9 VREF
2
16
1
15
10
5
4
DRVOUT
GND
CAI
VC
