Tool/software:
Hello,
We are considering two load switches for high side output drive in automotive application.
TPS281C100ADNTR, TPS1HTC100QPWPRQ1
We need below mandatory protections:
While both devices offer adequate protections, while referring both datasheets, page 8 shows below spec:
Does it mean when device is subjected short circuit currents as per above table, it will cause permanent damage?
Thanks.
Hi Rahul,
No. The ICL_ENPS is a specific current limit used when the device is enabled during a short circuit. Permanent in this case just means not transient or sustained rather than indicating permanent damage.
The idea is that if a short circuit event occurs the FET will turn off briefly before turning back on. At the time it turns on the short circuit will still be occurring and the device current will reach ICL_ENPS maximum before settling to the ICL limit chosen. It will sustain the current limit until the device safely shuts down due to thermal shutdown. In this way the device protects itself relying on the ICL_ENPS to clamp the current before it reaches shutdown.
See section "8.5.2.1 Short-Circuit and Overload Protection" of the datasheet for the detailed description.
"When this fast trip threshold is hit, the device immediately shuts off for a short period of time before quickly re-enabling and clamping the current to ICL level after a brief transient overshoot to the higher peak current (ICL_ENPS) level. The device will then keep the current clamped at the regulation current limit until the thermal shutdown temperature is hit and the device will safely shut-off." - 8.5.2.1 Short-Circuit and Overload Protection
See here the device is re-enabled into the short circuit and the current clamps at ICL_ENPS.
The datasheet also indicates that it is safe to repeatedly hit thermal shutdown without risk of damage to the device. So no permanent damage should be expected.
Thanks,
Sarah
