深圳市中立信电子科技有限公司

1 Features

1• 8-Pin Solution Reduces External Components

• Wide-Range Universal AC Input Voltage

• Fixed 65-kHz Operating Frequency

• Maximum Duty Cycle of 98% (typ.)

• Output Over/Undervoltage Protection

• Input Brown-Out Protection

• Cycle-by-Cycle Peak Current Limiting

• Open Loop Detection

• Low-Power User-Controlled Standby Mode

2 Applications

• CCM Boost Power Factor Correction Power

Converters in the 100 W to >2 kW Range

• Digital TV

• Home Electronics

• White Goods and Industrial Electronics

• Server and Desktop Power Supplies

3 Description

The UCC28019A 8-pin active Power Factor

Correction (PFC) controller uses the boost topology

operating in Continuous Conduction Mode (CCM).

The controller is suitable for systems in the 100 W to

>2 kW range over a wide-range universal ac line

input. Start-up current during undervoltage lockout is

less than 200 μA. The user can control low power

standby mode by pulling the VSENSE pin below

0.77 V.

Low-distortion wave shaping of the input current

using average current mode control is achieved

without input line sensing, reducing the external

component count. Simple external networks allow for

flexible compensation of the current and voltage

control loops. The switching frequency is internally

fixed and trimmed to better than ±5% accuracy at

25°C. Fast 1.5-A peak gate current drives the

external switch.

Numerous system-level protection features include

peak current limit, soft over-current, open-loop

detection, input brown-out, and output

over/undervoltage. Soft-start limits boost current

during start-up. A trimmed internal reference provides

accurate protection thresholds and a regulation setpoint.

An internal clamp limits the gate drive voltage

to 12.5 V.

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