24V high side short-circuit protection and thermal shutdown with restart using PROFET™ BTS452R

Open online SPICE simulator circuit link: atv_bp_24V_high_side_BTS452R_protection_SC_TR.tsc

24V High Side Power Switch PROFET™ BTS452R
Protection Features: Short Circuit to GND & Thermal
Shutdown with Restart

Thermal model description:
Thermal Model = 1: 1S0P PCB 600mm2
Thermal Model = 2: 1S0P PCB minimum footprint
Thermal Model = 3: 2S2P PCB no via
Thermal Model = 4: 2S2P PCB with via
Thermal Model = 5: no thermal consideration

The 24V high side power switch BTRS45R is a member of the outstanding
PROFET™ family (PROtected FET) and optimized for driving all types of
resistive, inductive and capacitive loads.The µC compatible power switch
can serve a wide application portfolio starting from 12V, 24V and up to 52V DC.

It replaces electromechanical relays and discrete circuits solutions.

This circuit demonstrates the protection features Short Circuit to GND of the
BTS452R. Many other PROFET™ devices provide similar protection features.

Once short circuit condition occurs, the load current increases dramatically and is
soon limited to the peak short circuit current IL_SCp.

Considering thermal behavior (choose thermal model 1 ... 4), the junction
temperature is also rising quickly. Once the thermal shutdown protection is
triggered, the device shuts down autonomously with restart. It shuts down and
restarts continuously if the temperature is higher than the trigger value.
Meanwhile, a fault signal is triggered at Pin ST.

{1. click here to set circuit parameters}
{2. click on "Run" to calculate components}
{3. click on "OK" and Simulate Transient }

{Supply voltage [V]}
Vbb:= 24 {use 12 ... 52}

{Short circuit trigger time tSC_on/off [s] }
tSC_on:= 10m {use 2m ... 25m}
tSC_off:= 15m {use tSC_on+5m ... 30m}

{Thermal model number: }
ThermalModel:= 5 {use 1 ... 5}