1 Features

1• 8-Pin Solution (No AC Line Sensing Needed)

• Wide Range Programmable Switching Frequency

(18 kHz to 250 kHz for MOSFET and IGBT-based

PFC Converters)

• Trimmed Current Loop Circuits for Low iTHD

• Reduced Current Sense Threshold (Minimizes

Power Dissipation in Shunt)

• Average Current-Mode Control

• Soft Over Current and Cycle-by-Cycle Peak

Current Limit Protection

• Output Overvoltage Protection With Hysteresis

Recovery

• Audible Noise Minimization Circuitry

• Open Loop Detection

• Enhance Dynamic Response During Output

Overvoltage and Undervoltage Conditions

• Maximum Duty Cycle of 96% (Typical)

• Burst Mode for No Load Regulation

• VCC UVLO, Low ICC Start-Up (< 75 μA)

2 Applications

• Universal AC Input, CCM Boost PFC Converters

in 100-W to Few-kW Range

• Server and Desktop Power Supplies

• White Good Appliances (Air Conditioners,

Refrigerators)

• Industrial Power Supplies (DIN Rail)

• Flat Panel (PDP, LCD, and LED) TVs

3 Description

The UCC28180 is a flexible and easy-to-use, 8-pin,

active Power-Factor Correction (PFC) controller that

operates under Continuous Conduction Mode (CCM)

to achieve high Power Factor, low current distortion

and excellent voltage regulation of boost preregulators

in AC - DC front-ends. The controller is

suitable for universal AC input systems operating in

100-W to few-kW range with the switching frequency

programmable between 18 kHz to 250 kHz, to

conveniently support both power MOSFET and IGBT

switches. An integrated 1.5-A and 2-A (SRC-SNK)

peak gate drive output, clamped internally at 15.2 V

(typical), enables fast turn-on, turn-off, and easy

management of the external power switch without the

need for buffer circuits.

Low-distortion wave shaping of the input current

using average current mode control is achieved

without input line sensing, reducing the external

component count. In addition, the controller features

reduced current sense thresholds to facilitate the use

of small-value shunt resistors for reduced power

dissipation, especially important in high-power

systems. To enable low current distortion, the

controller also features trimmed internal current loop

regulation circuits for eliminating associated

inaccuracies.