IRPLLNR3 查看數據表（PDF） - International Rectifier

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IRPLLNR3

Universal Input Linear Fluorescent Ballast using the IR2167

International Rectifier 

RPLLNR3

Figure 10 shows the voltage appearing across the lamp during Startup, Preheat, Ignition Ramp and

Run modes.

Fig. 10: Preheat, Ignition Ramp and Run Voltage in the lamp

Normal Power down

A normal power down occurs when the AC line voltage is disconnected from the ballast.

When this occurs the voltage on the VDC pin of the IR2167 drops below the line fault threshold (3V)

and the IR2167 shuts down in a controlled fashion. The ballast control oscillator is stopped, the half-

bridge driver outputs (LO and HO) are turned off and capacitors CPH, CRAMP, CSTART and CT are

discharged. IR2167 also goes into its UVLO/micro-power mode and the bus voltage begins to col-

lapse.

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