Functional description

L6572

14/22

Doc ID 023882 Rev 1

The frequency of the clock generator is fixed with the external resistor RCL, increasing the

resistance of RCL and reducing fCL.

5.13

Counter

The counter is formed as binary counter. A digital network generates signals that activate

the ignition recognition unit and control the D/A converter and the rated current generation

unit. The counter is reset by the UVLO unit.

5.14

D/A converter

The D/A converter forms the ramps for the rated resonant current during the ignition phase

and the powerboost phase.

Figure 5.

Operating phases

Preheat - phase

Ignition

Powerboost

Normal

Ires

Ignition

Recognition

ω

AM14885v1