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IRPLCFL5E
Figure 6.3 shows the VS (HB) Voltage, the lamp voltage and the lamp current during Run Mode.
Figure 6.3: VS (HB) Voltage (blue), Lamp Voltage (yellow) and the Lamp Current (green) during
Run Mode.
7. Fault Conditions
In case of fault conditions such as open filaments, failure to strike, deactivated lamp or no lamp, the
IR2520D will go into Fault Mode. In this mode the oscillator is latched off. To reset the IC back to
preheat mode, VCC must be recycled below and above the UVLO thresholds. This is done by
resetting the mains. In case of low AC line, the IR2520D will automatically increase the frequency to
maintain ZVS. In this way, the ballast will work at a lower power during a low AC line condition and
will operate at the proper power again when the line increases again.
7.1. Failure To Strike/ Deactivated Lamp Protection
This protection relies on the crest factor protection together with the non-ZVS circuit of the IR2520D,
both enabled when the voltage at the VCO pin reaches 4.6V.
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