DS3994 Maxim Integrated Products, DS3994 Datasheet - Page 18

• Manufacturer Part Number: DS3994
• Description: 4-Channel Cold Cathode Fluorescent Lamp Controller
• Manufacturer: Maxim Integrated Products

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DataSheet
4
4-Channel Cold-Cathode
Fluorescent Lamp Controller
Figure 9. Fault-Handling Flow Chart
18
U
.com
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LAMP OVERCURRENT
[INSTANTANEOUS IF
LOC BIT AT CR1.0]
ENABLED VIA THE
[RAMP AND REGULATE TO
RESET FAULT COUNTER
CURRENT BOUNDED BY
IF LAMP REGULATION
THRESHOLD IS MET
AND FAULT OUTPUT
INVERTER SUPPLIES
AT PROPER LEVELS?
[REGULATE LAMP
OVD THRESHOLD]
LAMP VOLTAGE]
STRIKE LAMP
RUN LAMP
DEVICE AND
YES
MOSFET GATE DRIVERS ENABLED
[1024 LAMP CYCLES]
FAULT WAIT
LAMP STRIKE TIMEOUT
[SEE REGISTER CR3]
[64 LAMP CYCLES]
LAMP OUT TIMEOUT
[SEE REGISTER CR3]
OVERVOLTAGE
NO
FAULT COUNTER = 15?
YES
YES
[ACTIVATE FAULT OUTPUT]
AUTO RETRY ENABLED?
[ARD BIT AT CR1.5]
INCREMENT FAULT
FAULT STATE
COUNTER
NO