InventChip IVCC1102F4AR

The IVCC1102 is a high-speed, precise and compact totem-pole PFC analog controller. It employs the advanced average current mode and fixed-ratio input voltage feedforward control. The control generates a duty cycle baseline D' = Vin/400V, while the current loop just provides small duty cycle adjustment. It essentially speeds up the current loop and results in excellent current command tracking. For the same reason, when AC drops abruptly, the PWM duty cycle can be adjusted without delay, which prevents the boost inductor current from reversing. The IVCC1102 controller can be used for high AC frequency power factor correction, which usually operates at 400Hz. For the voltage loop, output Vo is sampled and held at Vac zero-crossing. By doing so, the Vo’s second harmonic is rejected and Vo average voltage is precisely sensed. A non-linear control is added to accelerate the voltage loop when output voltage error exceeds 5% of the set value. A high frequency (about 200kHz) soft-start PWM pattern is inserted at each AC crossover point to smooth out the AC current waveform.

• SOIC-16 and QFN 4x4 20L packages
• 5V VCC with UVLO
• 2 line-frequency switch and 2 high-frequency PWM gate drive signals
• Optimized AC current zero-crossing control
• Average current mode control with fixed ratio input voltage feedforward
• Auto reverse current prevention at AC drop
• Optimized step load response with non-linear voltage loop and accelerated current loop
• Low THD with Vo harmonic rejection sensing
• Up to 150kHz programmable PWM frequency
• Overvoltage Protection, Open-Loop Protection
• AC Overvoltage Protection and UVLO
• Peak Current Limiting
• Burst mode options
• Burst starts at Vac zero-crossing to minimize audible noise
• Suitable for both AC and DC inputs
• Suitable for hall and resistor current sensing
• Suitable for over 400Hz PFC control
• Relay signal, synchronized with Vac, ease timing control to reduce inrush current

• Server Power supplies
• Compact PFC power modules
• TV and gaming Xbox power supplies
• High power phone and laptop chargers