/ 2 -Bridge Off
Power Turned On
UVLO Mode
1
I QCC ? 150 μ A
CPH = 0V
Oscillator Off
SD > 2.0V
(Lamp Removal)
or
VCC < 9.5V
(Power Turned Off)
VCC > 11.4V (UV+)
and
VDC > 5.1V (Bus OK)
and
SD < 1.7V (Lamp OK)
and
T J < 140C (T jmax )
VCC < 9.5V
(VCC Fault or Power Down)
or
VDC < 3.0V
(dc Bus/ac Line Fault or Power Down)
or
SD > 2.0V
(Lamp Fault or Lamp Removal)
/ 2 -Bridge Off
/ 2 -Bridge @ f PH
FAULT Mode
Fault Latch Set
1
I QCC ? 150 μ A
CPH = 0V
VCC = 15.6V
Oscillator Off
T J > 140C
(Over-Temperature)
PREHEAT Mode
1
CPH Charging @ I PH = 1 μ A
RPH = 0V
RUN = Open Circuit
CS Disabled
CPH > 4.0V
CS > CS+ Threshold
(Failure to Strike Lamp
or Hard Switching)
or
T J > 140C
(Over-Temperature)
CS > CS+ Threshold
(Over-Current or Hard Switching)
or
CS < 0.2V
(No-Load or Below Resonance)
or
T J > 140C
(Over-Temperature)
www.irf.com
(End of PREHEAT Mode)
IGNITION RAMP Mode
f PH ramps to f MIN
CPH Charging @ I PH = 1 μ A
RPH = Open Circuit
RUN = Open Circuit
CS+ Threshold Enabled
CPH > 5.1V
(End of IGNITION RAMP)
RUN Mode
f MIN Ramps to f RUN
CPH Charges to 7.6V Clamp
RPH = Open Circuit
RUN = 0V
CS- Threshold Enabled
Figure 2: IR21571 State Diagram
7
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