1 Features

• Interleaved average current-mode PWM control

with inherent current matching

• Advanced current-synthesizer current sensing for

superior efficiency

• Synchronization capability to external clock

• Highly-linear multiplier output with internal

quantized voltage feed-forward for near-unity PF

• Enhanced transient response through slew-rate

correction of voltage amplifier output current

• Extended-range programmable frequency

– UCC28070A: 10kHz to 300kHz

– UCC28070: 30kHz to 300kHz

• Programmable maximum duty-cycle clamp

• Programmable frequency-dithering rate and

magnitude (up to 30kHz) for EMI reduction

• Programmable soft-start

• Programmable peak current limiting

• External PFC-disable interface

• Protections: bias-supply UVLO, output

overvoltage, open‑loop detection, open-circuit

detection on VSENSE and VINAC,

and PFC-enable monitoring

2 Applications

• PFC using IGBT, Si or GaN power switches

• Air Conditioners and major appliances

• Power Delivery, Telecom and server power

• TVs, desktops and professional audio

• EV charging infrastructure

3 Description

The UCC28070A and UCC28070 are advanced

power factor correction (PFC) controllers that

each integrate two pulse-width modulators (PWMs)

operating interleaved by 180° in CCM boost-mode.

Both devices can switch at frequencies up to 300kHz,

while the UCC28070A device is capable of operating

down to 10kHz for IGBT power-switch based PFC

converters in high-power applications. The minimum

operating frequency of the UCC28070 device is

limited to 30kHz.

The 180° out-of-phase interleaved operation

generates substantial reduction in input and output

ripple currents and conducted-EMI filtering becomes

easier and less expensive. All the other features and

benefits of the UCC28070A and UCC28070 devices

are the same.

Both devices feature multiple innovations including

current synthesis and quantized voltage feedforward

to promote performance enhancements in PF,

efficiency, THD, and transient response. In addition,

frequency dithering, clock synchronization, and slewrate

enhancement further expand the potential for

performance improvements. Also, protection features

include output overvoltage detection, programmable

peak-current limit, undervoltage lockout, and openloop

protection.