DS3881 MAXIM [Maxim Integrated Products], DS3881 Datasheet - Page 16

• Manufacturer Part Number: DS3881
• Description: Single-Channel Automotive CCFL Controller
• Manufacturer: MAXIM [Maxim Integrated Products]

Single-Channel Automotive CCFL Controller
Figure 8. Fault-Handling Flowchart
16
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LAMP OVERCURRENT
[INSTANTANEOUS IF
LOCE BIT AT CR1.0]
ENABLED BY THE
STATUS BIT
SET LOC_L
[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
STATUS BIT
FAULT_RT
CLEAR
YES
MOSFET GATE DRIVERS ENABLED
[1024 LAMP CYCLES]
FAULT WAIT
LAMP STRIKE TIMEOUT
[SEE REGISTER SSP1]
[SEE REGISTER SSP1]
[64 LAMP CYCLES]
LAMP OUT TIMEOUT
OVERVOLTAGE
NO
FAULT COUNTER = 15?
YES
SET LOUT_L
STATUS BIT
STATUS BIT
STATUS BIT
SET STO_L
SET OV_L
YES
[ACTIVATE FAULT OUTPUT]
AUTORETRY ENABLED?
FAULT_RT STATUS BIT
[ARD BIT AT CR1.5]
INCREMENT FAULT
AND FAULT_RT
COUNTER / SET
FAULT STATE
SET FAULT_L
STATUS BITS
NO