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.