FAULT NAME |
STATUS BIT |
CONDITION |
TRIGGER FAULT INTERRUPT |
ENTER FAULT RECOVERY |
ACTION |
Boost overcurrent |
BSTOCP_STATUS |
FB pin voltages falls below VUVP level for > 110 ms |
Yes |
Yes |
Device goes to standby and then attempts to restart 200 ms after fault occurs. |
Boost overvoltage low |
BSTOVPLOW_STATUS |
FB pin voltages rises above VOVPL level |
No |
No |
Boost stops switching until boost voltage level falls. The device remains in normal mode with LED drivers operational. |
Boost OVP high |
BSTOVPH_STATUS |
FB pin voltages rises above VOVPH level |
Yes |
Yes |
Device goes to standby and waits until output voltage falls below threshold before restarting. |
Boost sync clock invalid |
BSTSYNC_STATUS |
Device is enabled while a valid external SYNC clock is running. Then SYNC stops or changes to invalid frequency. Valid range is 1.2× to 1.5× of frequency selected by BST_FSET resistor. |
No |
No |
Device defaults to internal clock frequency selected by BST_FSET resistor. If SYNC input is held high then spread spectrum is enabled. If SYNC input is held low then spread spectrum is disabled. |
VIN overvoltage |
VINOVP_STATUS |
VIN voltage rises above 43 V. |
Yes |
No |
Device goes to standby and waits until output voltage falls below threshold before restarting. |
VIN undervoltage |
VINUVLO_STATUS |
VIN voltage falls below 2.8 V. |
Yes |
No |
Device goes to standby and then attempts to restart once the input voltage rises above threshold. |
VIN overcurrent |
VINOCP_STATUS |
Voltage across RISENSE exceeds 220 mV |
Yes |
Yes |
Device goes to standby and then attempts to restart 200 ms after fault occurs. |
VDD undervoltage |
VDDUVLO_STATUS |
VDD level falls below VDDUVLO threshold. |
Yes |
No |
Device restarts once VDD level rises above VDDUVLO threshold. |
Thermal shutdown |
TSD_STATUS |
Junction temperature rises above TTSD threshold. |
Yes |
No |
Device goes to standby and then attempts to restart once die temperature falls below threshold. |
Open LED string |
LED_STATUS
OPEN_LED |
Headroom voltage on one or more channels is below minimum level and boost has adapted to maximum level. |
Yes |
No |
Faulted LED string is disabled and removed from adaptive boost control loop. String is re-enabled next power cycle. |
Shorted LED |
LED_STATUS |
Headroom voltage on one or more channels is above the SHORTED_LED_THRESHOLD for > 5 ms while the headroom of at least one channel is still below this threshold. |
Yes |
No |
Faulted LED string is disabled and removed from adaptive boost control loop. String is re-enabled next power cycle. |
Invalid LED string detected |
INVSTRING_STATUS |
LED string detection does not match one of 8 valid configurations |
Yes |
No |
Device defaults to six LED string phase shift mode. String detection reoccurs next power cycle. |
FSET detection fault |
FSET_STATUS |
BST_FSET or PWM_FSET are missing or an invalid value |
Yes |
No |
Boost does not start up. Fault is cleared by VDD cycling with correct resistor connection at FSET pin. |
Charge pump fault |
CP_STATUS |
Charge pump voltage level is abnormal. |
No |
No |
Device functions normally, if possible. If charge pump issue is severe, it is likely boost overcurrent fault will trip. |
Charge pump components missing |
CPCAP_STATUS |
Charge pump is missing components. |
No |
No |
Device functions normally, if possible. If charge pump issue is severe, it is likely boost overcurrent fault will trip. |