1FEATURES

• Qualified for Automotive Applications

• Interleaved Average Current-Mode PWM

Control with Inherent Current Matching

• Advanced Current Synthesizer Current

Sensing for Superior Efficiency

• Highly-Linear Multiplier Output with Internal

Quantized Voltage Feed-Forward Correction

for Near-Unity PF

• Programmable Frequency (30 kHz to 300 kHz)

• Programmable Maximum Duty-Cycle Clamp

• Programmable Frequency Dithering Rate and

Magnitude for Enhanced EMI Reduction

– Magnitude: 3 kHz to 30 kHz

– Rate: Up to 30 kHz

• External Clock Synchronization Capability

• Enhanced Load and Line Transient Response

through Voltage Amplifier Output Slew-Rate

Correction

• Programmable Peak Current Limiting

• Bias-Supply UVLO, Over-Voltage Protection,

Open-Loop Detection, and PFC-Enable

Monitoring

• External PFC-Disable Interface

• Open-Circuit Protection on VSENSE and

VINAC pins

• Programmable Soft Start

• 20-Lead TSSOP Package

DESCRIPTION

The UCC28070 is an advanced power factor

correction device that integrates two pulse-width

modulators (PWMs) operating 180° out of phase.

This interleaved PWM operation generates substantial reduction in the input and output ripple

currents, and the conducted-EMI filtering becomes

easier and less expensive. A significantly improved

multiplier design provides a shared current reference

to two independent current amplifiers that ensures

matched average current mode control in both PWM

outputs while maintaining a stable, low-distortion

sinusoidal input line current.

The UCC28070 contains multiple innovations

including current synthesis and quantized voltage

feed-forward to promote performance enhancements in PF, efficiency, THD, and transient response.

Features including frequency dithering, clock

synchronization, and slew rate enhancement further

expand the potential performance enhancements.

The UCC28070 also contains a variety of protection

features including output over-voltage detection,

programmable peak-current limit, under-voltage

lockout, and open-loop protection.