Cirrus Logic AN356 - Manual (Page 3)

AN356
AN356REV1 3
Figure 3. ZCD Performance — Operation at 100% Load, 108 VAC
Figure 4. ZCD Performance — Operation at 50% Load, 108 VAC
4. Summary
An alternative for ZCD sensing using a resistive divider is presented. Care must be taken to choose appropriate resistor value to
prevent the IC from being damaged by excessive voltages or currents.
Ch 1 - MOSFET Drain
Ch 2 - ZCD Pin 5
Ch 3 - Gate Drive
Ch 4 - Current in Boost
Inductor
Ch 1 - MOSFET Drain
Ch 2 - ZCD Pin 5
Ch 3 - Gate Drive
Ch 4 - Current in Boost
Inductor