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AN2747 Datasheet(PDF) 37 Page - STMicroelectronics

Part # AN2747
Description  250 W HID metal halide electronic ballast
PDF  44 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

AN2747 Datasheet(HTML) 37 Page - STMicroelectronics

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AN2747
Experimental results
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13.2
Lamp ignition phase
The high voltage transformer generates a proper ignition voltage to ignite the lamp. The
voltage across the lamp is shown below in Figure 34.
Figure 34.
Lamp ignition voltage
13.3
Warm-up phase
During this phase the lamp current is limited and the lamp voltage increases starting from a
quarter of nominal voltage until the rated voltage. During this phase the lamp power
increases and at 80% of nominal lamp power the control power is activated, regulating the
lamp power.



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