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ERJ-8GEYJ56K Datasheet(PDF) 14 Page - International Rectifier

Part No. ERJ-8GEYJ56K
Description  High Power Factor/Low THD
Download  16 Pages
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Manufacturer  IRF [International Rectifier]
Direct Link  http://www.irf.com
Logo IRF - International Rectifier

ERJ-8GEYJ56K Datasheet(HTML) 14 Page - International Rectifier

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Figure 15: Failure of lamp to ignite condition (lamp
filaments good): Upper trace: voltage across
RCS, Lower trace: lamp voltage
Figure 16: Failure of lamp to ignite condition (lamp
filaments good): Lamp voltage during the end
of Preheat and Ignition Ramp modes
Figure 17: Hard-switching condition (upper filament
open): Upper trace: voltage across RCS,
Middle trace: IC2 LO pin voltage,
Lower trace: IC2 HO-VS pin voltage
Figure 18: Hard-switching condition (upper filament open):
Lamp voltage during Preheat mode and beginning of
Ignition Ramp mode when lamp fault is detected
At the completion of the Ignition Ramp mode (beginning of the Run mode) the near/below resonance
(under-current) detection is also enabled. Near/below resonance detection is performed by synchro-
nously sensing the voltage across resistor RCS, which relates to the current flowing in the low side
MOSFET (M3), just prior to the turn off of M3. If this voltage is lower than the near/below resonance
threshold (CS- = 0.2V) of the CS pin of IC2, a lamp fault condition is signaled and the ballast goes
into Fault mode. This could occur if the frequency of oscillation becomes too close to the resonant


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