TPS1HC30-Q1
ZHCSP75A –JULY 2022 –REVISED DECEMBER 2022
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condition: VVS = 13.5 V, inductance from 0.1 mH to 400 mH, R = 0 Ω, FR4 2s2p board, 2- × 70-μm copper, 2- ×
35-μm copper, thermal pad copper area 600 mm2.
8.3.4 Full Protections and Diagnostics
表 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. For details, refer to the following table.
表8-1. Diagnostic Enable Logic Table
DIAG_EN IN Condition
Protections and Diagnostics
ON
HIGH
OFF
See Fault Table
ON
Diagnostics disabled, protection normal
SNS and FLT are high impedance
LOW
OFF
表8-2. Fault Table
Conditions
EN
VOUT
Latch
FLT
SNS
Behavior
Recovery
L
L
x
Hi-Z
Hi-Z
0
Normal
Normal
ILOAD
RON
×
H
H
x
x
ILoad / Ksns Normal
Holds the current at the current limit
VBB –
Overcurrent
L
L
VSNSFH until thermal shutdown or when the
overcurrent event is removed
ILIM
×
RLOAD
Auto retries when THYS
STG, Relative
Thermal
Shuts down when devices hits relative is met and it has been
H
H/L
L
VSNSFH
or absolute thermal shutdown
longer than tRETRY
amount of time
Shutdown,
Absolute Thermal
Shutdown
Shuts down when devices hits relative Stays off until latch or
H
H
L
H/L
H
H
x
L
Hi-Z
L
VSNSFH
or absolute thermal shutdown
enable is toggled
Normal behavior, user can judge
through the SNS pin output if it is an
open load or not
ILoad
/
KSNS = ~0
Open load, STB
Reverse Polarity
Internal pullup resistor is active. If VBB Clears when fault goes
H
x
VSNSFH
away
–VOUT < VOL then fault active.
Channel turns on to lower power
dissipation. Current into ground pin is
limited by external ground network.
x
x
x
x
x
表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
500 µs
8.3.4.1 Short-Circuit and Overload Protection
TPS1HC30-Q1 provides output short-circuit protection to ensure that the device prevents current flow in the
event of a low impedance path to GND, removing the risk of damage or significant supply droop. The device is
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