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resonant frequency of the LC load circuit until the lamp ignition voltage is exceeded and the lamp
ignites. The maximum ignition voltage that can be generated is determined from the value of RCS, but
in any case the ignition frequency must be higher than the run frequency. Figure 4 shows the
ramping of voltage appearing across the lamp.
Figure 4: Ignition Ramp (crossed lamps)
During the Ignition Ramp mode the voltage on the CPH pin of the IR2166 continues to ramp up until
the voltage at the CPH pin of the IR2166 exceeds the Run mode threshold (13V). Over-current
sensing is also enabled at the beginning of the Ignition Ramp mode. A full explanation of the function-
ality of the over-current sensing is in the section on Fault Mode.
www.irf.com
RD-0602
12
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