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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

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