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ZHCSLK6A July 2021 – December 2021 TPS1HC100-Q1

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PWP|14

散热焊盘机械数据 (封装 | 引脚)

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8.3.4 Full Protections and Diagnostics

Table 8-1 is when DIAG_EN is enabled. When DIAG_EN is low, current sense and FLT are disabled. The output is in high-impedance mode. Refer to Table 8-1 for details.

Table 8-1 Diagnostic Enable Logic Table

DIAG_EN	IN Condition	Protections and Diagnostics
HIGH	ON	See Fault Table
HIGH	OFF	See Fault Table
LOW	ON	Diagnostics disabled, protection normal SNS and FLT are high impedance
LOW	OFF

Table 8-2 Fault Table

Conditions	EN	VOUT	Latch	FLT	SNS	Behavior	Recovery
Normal	L	L	x	Hi-Z	0	Normal
Normal	H	V_BB – I_LOAD× R_ON	x	Hi-Z	I_Load/ K_sns	Normal
Overcurrent	H	V_BB – I_LIM × R_LOAD	x	L	V_SNSFH	Holds the current at the current limit until thermal shutdown or when the overcurrent event is removed. Typical deglitch time for device to recognize overcurrent fault and begin to act on it is 2.5 μs.
STG, Relative Thermal Shutdown, Absolute Thermal Shutdown	H	H/L	L	L	V_SNSFH	Shuts down when devices hits relative or absolute thermal shutdown. Typical deglitch time for device to recognize overcurrent fault and begin to act on it is 2.5 μs. Typical deglitch time for device to recognize a T_ABS fault is 20 μs.	Auto retries when T_HYS is met and it has been longer than t_RETRY amount of time
STG, Relative Thermal Shutdown, Absolute Thermal Shutdown	H	H/L	H	L	V_SNSFH	Shuts down when devices hits relative or absolute thermal shutdown. Typical deglitch time for device to recognize overcurrent fault and begin to act on it is 2.5 μs. Typical deglitch time for device to recognize a T_ABS fault is 20 μs.	Stays off until latch or enable is toggled
Open load, STB	H	H	x	Hi-Z	I_Load / K_SNS = ~0	Normal behavior, user can judge through SNS pin output if it is an open load or not.
Open load, STB	L	H	x	L	V_SNSFH	Internal pullup resistor is active. If V_BB – V_OUT < V_OL then fault active. Typical deglitch time before fault is indicated is 700 μs.	Clears when fault goes away
Reverse Polarity	x	x	x	x	x	Channel turns on to lower power dissipation. Current into ground pin is limited by external ground network.

Table 8-3 Deglitch Time for Each Fault Condition

Fault Condition	Deglitch Time
ILIM	2.5 µs
TREL	2.5 µs
TABS	20 µs
Open load	700 µs