JAJSP25 データシート

JAJSP25 November 2023 TPS546A24S

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6.3.19 Fault Management

For the response on OC fault, OT fault, and thermal shutdown for multi-phase stack, the shutdown response has the highest priority, followed by restart response. Continue operating without interruption response has the lowest priority.

When multiple faults occur in rapid succession, the first fault to occur to masking the second fault is possible. If the first fault to be detected is configured to continue operating without interruption, and the second fault is configured to shutdown and restart, the second fault shuts down but can fail to restart as programmed.

Table 6-4 Fault Protection Summary

FAULT OR WARNING	PROGRAMMING	FAULT RESPONSE SETTING	FET BEHAVIOR	ACTIVE DURING t_{ON_RISE}	SMB_ALRT	MASKABLE	PGOOD LOGIC
Internal OT fault	(4Fh) OT_FAULT_LIMIT	Shutdown	Both FETs off	Yes	Y	Y	Low
		Restart	Both FETs off, restart				Low
		Ignore	FETS still controlled by PWM				High
Internal OT warning	(51h) OT_WARN_LIMIT	Shutdown or restart on Fault	FETS still controlled by PWM	Yes	Y	Y	High
Internal OT warning	(51h) OT_WARN_LIMIT	Ignore fault	FETS still controlled by PWM	Yes	Y	Y	High
TSD	Threshold fixed internally	Shutdown	Both FETs off	Yes	Y	Y	Low
		Restart	Both FETs off, restart
		Ignore	FETS still controlled by PWM
		Ignore	FETS still controlled by PWM				High
Low Side OC fault	(46h) IOUT_OC_FAULT_LIMIT	Shutdown	3 PWM counts, then both FETs off	Yes	Y	Y	Low
		Restart	3 PWM counts, then both FETs off, restart after [DELAY]*t_{ON_RISE}				Low
		Ignore	FETS still controlled by PWM				High
Low Side OC warning	(4Ah) IOUT_OC_WARN_LIMIT	Shutdown or restart on Fault	FETS still controlled by PWM	Yes	Y	Y	High
Low Side OC warning	(4Ah) IOUT_OC_WARN_LIMIT	Ignore fault	FETS still controlled by PWM	Yes	Y	Y	High
Negative OC fault (lower priority than OVF)	N/A	Enable	Turn off LS FET	Yes	Y	Y	Low
Negative OC fault (lower priority than OVF)	N/A	Disable	FETS still controlled by PWM	Yes	Y	Y	High
High side OC fault	(46h) IOUT_OC_FAULT_LIMIT	Shutdown	3 cycles of pulse-by-pulse current limiting followed by both FETs off	Yes	Y	Y	Low
		Restart	3 cycles of pulse-by-pulse current limiting followed by both FETs off, restart after [DELAY]*t_{ON_RISE}				Low
		Ignore	FETS still controlled by PWM				High
Vout OV fault	(40h) VOUT_OV_FAULT_LIMIT	Shutdown	LS FET latched ON or turned on till V_OUTreaches 200 mV/VOUT_SCALE_LOOP; HS FET OFF	No	Y	Y	Low
		Restart	LS FET latched ON or turned on till V_OUTreaches 200 mV/VOUT_SCALE_LOOP; HS FET OFF, restart after [DELAY] * t_{ON_RISE}				Low
		Ignore	FETS still controlled by PWM				High
V_OUT OVF fix	(40h) VOUT_OV_FAULT_LIMIT	Shutdown	LS FET latched ON or turned on till V_OUTreaches 200 mV/VOUT_SCALE_LOOP; HS FET OFF	Yes	Y	Y	Low
		Restart	LS FET latched ON or turned on till V_OUTreaches 200 mV/VOUT_SCALE_LOOP; HS FET OFF, restart after [DELAY]*t_{ON_RISE}				Low
		Ignore	FETS still controlled by PWM				High
Vout OV warning	(42h) VOUT_OV_WARN_LIMIT	Shutdown or restart on Fault	FETS still controlled by PWM	No	Y	Y	High
Vout OV warning	(42h) VOUT_OV_WARN_LIMIT	Ignore Fault	FETS still controlled by PWM	No	Y	Y	High
Vout UV fault	(44h) VOUT_UV_FAULT_LIMIT	Shutdown	Both FETs off	No	Y	Y	Low
		Restart	Both FETs off , restart after [DELAY]*t_{ON_RISE}				Low
		Ignore	FETS still controlled by PWM				High
Vout UV warning	(43h) VOUT_UV_WARN_LIMIT	Shutdown or restart on Fault	FETS still controlled by PWM	No	Y	Y	Low
Vout UV warning	(43h) VOUT_UV_WARN_LIMIT	Ignore fault	FETS still controlled by PWM	No	Y	Y	Low
t_{ON MAX} rault	(62h) TON_MAX_FAULT_LIMIT	Shutdown	Both FETs off	Yes	Y	Y	Low
		Restart	Both FETs off, restart after [DELAY]*t_{ON_RISE}				Low
		Ignore	FETS still controlled by PWM				High
PVin UVLO	(35h) VIN_ON, (36h) VIN_OFF	Shutdown	Both FETs off	Yes	Y	Y	Low
PVIN OV FAULT	(55h) VIN_OV_FAULT_LIMIT	Shutdown	Both FETs off	Yes	Y	Y	Low
		Restart	Both FETs off, restart				Low
		Ignore	FETS still controlled by PWM				High
BCX_fault	N/A	N/A	FETS still controlled by PWM	Yes	Y	Y	High
Pin_Strap_NonConverge	N/A	VSEL	Both FETs off, pull low VSHARE	No (active before t_{ON_RISE})	N	N/A	Low
		MSEL1
		MSEL2
		ADRSEL
SYNC_Fault	N/A	Loop controller or stand-alone device	FETS still controlled by PWM	Yes	N	N/A	High
SYNC_Fault	N/A	Loop follower device	Both FETs off, pull low VSHARE	Yes	N	N/A	High
		Loop follower device	Both FETs off, pull low VSHARE				Low
SYNC_High/Low	N/A	Loop controller or stand-alone device	FETS still controlled by PWM	Yes	N	N/A	High
SYNC_High/Low	N/A	Loop follower device	Both FETs off, pull low VSHARE	Yes	N	N/A	High
		Loop follower device	Both FETs off, pull low VSHARE				Low

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6.3.19 Fault Management