IRPLLNR3 查看數據表（PDF） - International Rectifier

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IRPLLNR3

Universal Input Linear Fluorescent Ballast using the IR2167

International Rectifier 

IRPLLNR3

Also note that the voltage on capacitor CRAMP is still increasing at the point when the lamp has

already ignited meaning the frequency is still ramping down to the final minimum ignition frequency.

This minimum frequency corresponds to the absolute maximum ignition voltage required by the lamp

under all conditions. Figure 8 shows the ignition ramp and the maximum ignition voltage with crossed

lamp (in this case the oscillator ramps down to the final minimum ignition frequency).

Figure 7:

Upper trace: voltage on capacitor

CRAMP during Ignition Ramp mode

Lower trace: Lamp voltage during

Ignition Ramp mode

12

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