The UCC28070DWR is a 2-phase Interleaved CCM PFC Controller 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.
Interleaved average current-mode PWM control with inherent current matching
Advanced current synthesizer current sensing for superior efficiency
Programmable frequency (30 to 300kHz)
Programmable maximum duty-cycle clamp
Programmable frequency dithering rate and magnitude for enhanced EMI reduction
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
Green product and no Sb/Br
ESD sensitive device, take proper precaution while handling the device.
