Cirrus-logic AN356 Manuel d'utilisateur télécharger pdf (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

1 2 3 4

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