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The UCC 28070 is an advanced power factor correction (PFC) device that integrates two pulse width modulators (PWMS) operating in 180° phase. This interleaved PWM operation generates a large amount of input and output ripple current, making conducted-EMI filtering easier and cheaper. A significantly improved multiplier design provides a shared current reference to two independent current amplifiers, ensuring matched average current mode control at both PWM outputs while maintaining stable, low distortion, sinusoidal input line currents.

The UCC 28070 device incorporates several innovations including current synthesis and quantized voltage feedforward to improve performance in PF, efficiency, THD and transient response. Features including frequency jitter, clock synchronization, and spin rate enhancements further expand the potential performance enhancements.

The UCC 28070 device also includes various protection features including output overvoltage detection, programmable peak current limit, undervoltage lockout and open loop protection.

Interleaved Average Current Mode PWM Control with Internal Current Matching Advanced Current Synthesizer Internal Quantized Voltage Feedforward Output High Linearity Multiplier 30 kHz to 300 kHz Programmable Maximum Duty Cycle Programmable Frequency Jitter Rate and Amplitude for Enhanced EMI Reduction: 3 kHz to 30 kHz Rates state response, overvoltage protection, open loop detection and pfc-enable external pfc-disable interface open circuit protection on VSENSE and VINAC pins