CMP-High Protection: If CMP is more than 3V in
normal mode, the IC is shut down after a delay of 10ms,
as shown in Figure 54. This protection is disabled in
striking mode to ignite lamps reliably.
Figure 54. CMP-High Protection
High-FB Protection: If the minimum of the rectified OLP
max
OLP
voltages( V
) is more than 3.5V, the counter starts
counting eight rectified OLP pulses in normal mode, then
the IC enters shutdown, as shown in Figure 55. This
counter is reset by detecting the positive edge of BCT.
This protection is disabled in striking mode to ignite
lamps reliably.
CMP
0
3.5V
0
OLP
-3.5V
8 pulses counting
Shut down
BCT
Counter reset
0
0
0
OUTA
OUTB
OUTC
OUTD
Figure 55. High-FB Protection
Thermal Shutdown: The IC provides the function to
detect the abnormal over-temperature. If the IC
temperature exceeds approximately 150°C, the thermal
shutdown triggers.
© 2007 Fairchild Semiconductor Corporation
FAN7317 • 1.0.2
www.fairchildsemi.com
19
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