UCC28070DWR, PFC контроллер, 11.2В до 21В и 20мА, 11.2В отключение, 50% коэффициент заполнения, 300кГц, SOIC-20

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

Полупроводники - Микросхемы\Микросхемы Управления Питанием\Корректоры Коэффициента Мощности

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