ZHCSO18A 数据表 | 德州仪器 TI.com.cn

ZHCSO18A december 2022 – june 2023 TPS281C30

PRODUCTION DATA

Current Sensing is active when DIAG_EN enabled. When DIAG_EN is low, current sense is disabled. The SNS output is in high-impedance mode.

Table 9-2 DIAG_EN Logic Table

DIAG_EN	EN Condition	Protections and Diagnostics
HIGH	HIGH	See Fault Table
HIGH	LOW	See Fault Table
LOW	HIGH	Diagnostics disabled and SNS output is set to high Impedance. Protection is normal and FAULT continues to indicate TSD or ILIM.
LOW	LOW

Table 9-3 Status Table (DIAG_EN=HIGH )

Conditions	EN	VOUT	OL_ON	FAULT	SNS	Behavior	Recovery
Normal Standard Sensing	L	L	L	Hi-Z	0	Normal
Normal Standard Sensing	H	H	L	Hi-Z	I_Load/ K_sns1	Normal
High Accuracy Sense Invalid Range	H	H	H	L	I_Load / K_sns1	FAULT is asserted signaling that high accuracy sensing is not enabled since I_Load>I_{Ksns2_EN}	Clears when load falls below IKSNS2_EN or OL_ON is reset to LO.
High Accuracy Sense Normal Operation	H	H	H	Hi-Z	I_Load / K_sns2	Enables x50 sense ratio for high accuracy sensing and FAULT stays Hi-Z since valid condition is met I_Load<I_{Ksns2_EN.}
Overcurrent	H	V_S - I_LIM*R_LOAD	x	L	V_SNSFH	Holds the current at the current limit until thermal shutdown
STG, Relative Thermal Shutdown, Absolute Thermal Shutdown	H	H/L	x	L	V_SNSFH	Shuts down when devices hits relative or absolute thermal shutdown	Auto retries when T_HYSis met and it has been longer than t_RETRY amount of time
Open Load	H	H	L	Hi-Z	I_Load / K_sns1 = ~0	Normal behavior, user can judge if it is an open load or not
	H	H	H	Hi-Z	I_Load / K_sns2 = ~0	Normal behavior, user can judge if it is an open load or not
	L	H	L	L	V_SNSFH	Internal pullup resistor is active. If V_S – V_OUT < V_OL then fault active	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