The UCC28070APW is a two-phase interleaved current-mode Power Factor Correction (PFC) Controller with extended frequency range capable of operating at low switching frequencies desired for IGBT power-switch based PFC converters in high-power applications. Thus extending the range of operation compared to the UCC28070 device whose minimum operating frequency was 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. It also features 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
● Highly-linear multiplier output with internal
● Quantized voltage feed-forward correction for near-unity PF
● 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, overvoltage 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
●Device has limited built-in ESD protection, leads should be shorted together or the device placed in conductive foam during storage or handling to prevent electrostatic damage to the MOS gates.
