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IRS2168DPBF Datasheet(PDF) 13 Page - International Rectifier

Part No. IRS2168DPBF
Description  ADVANCED PFC BALLAST CONTROL IC
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Maker  IRF [International Rectifier]
Homepage  http://www.irf.com
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IRS2168DPBF Datasheet(HTML) 13 Page - International Rectifier

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IRS2168D(S)PbF
www.irf.com
Page 13
ignition voltage) of the ballast output stage. Should this
voltage exceed the internal threshold of 1.2 V (VCSTH+), the
ignition regulation circuit controls the voltage on the VCO
pin to increase the frequency slightly (see Fig. 6). This
cycle-by-cycle feedback from the CS pin to the VCO pin
will adjust the frequency each cycle to limit the amplitude
of the current for the entire duration of ignition mode.
t
t
t
V
VCO
V
CS
VS
LO
HO
1.25V
2V
Figure 6:
Ignition regulation timing diagram
When CPH exceeds 2/3*VCC (VCPHRUN+) for the second
time, the IC enters run mode and the fault counter
becomes enabled. The ignition regulation disabled in run
mode but the IC will enter fault mode after 65 (nEVENTS)
consecutive over-current faults and gate driver outputs
HO, LO and PFC will be latched low.
The output voltage of the ballast will increase during the
ignition ramp tRAMP because the frequency ramp down
from the preheat frequency to the ignition frequency and
will be constant during ignition because the ignition
regulation circuit will regulate the amplitude of the current
for the entire duration of the ignition time tIGN (Figs. 7 and
8).
During ignition mode, the PFC circuit is working in high-
gain mode and keeps the DC bus voltage regulated at a
constant level.
The high-gain mode is necessary to
prevent the DC bus from decreasing during lamp ignition
or ignition regulation. Also during ignition mode, the
SD/EOL fault is disabled.
tPH
tIGN
tRAMP
VOUT
VCPH
Figure 7:
Ballast output voltage and CPH pin during
preheat and ignition with deactivated lamp, time span
100ms
tIGN
tRAMP
VOUT
VCPH
Figure 8:
Ballast output voltage and CPH pin during
preheat and ignition with deactivated lamp, time span
50ms


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