Automotive smart high side switch BSP452 test-bench: over-temperature & short circuit protection

Open online SPICE simulator circuit link: atv_bp_protection_12V_BSP452_ot_sc.tsc

Smart High-Side Power Switch BSP452
Protection Features: Overtemperature with hysteresis
and short circuit

{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:= 20 {Use 5....34}

{Short circuit on/off trigger time [s] }
tSC_on:= 5m
tSC_off:= 20m

{Thermal model number: }
THERMALMODEL:= 4 { use 1....4 }

{Thermal model description: }
{Thermal Model = 1: 1S0P PCB 600mm2 }
{Thermal Model = 2: 2S2P no vias }
{Thermal Model = 3: 2S2P vias }
{Thermal Model = 4: 1S0P footprint }

The BSP452 is high side power switch with integrated vertical power FET,
providing embedded protection and diagnostic functions.

This circuit demonstrates the overtemperature with hysteresis and short
circuit protection features of the BSP452. Many other 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(SC) of about 2A.

Considering thermal behavior (choose thermal model 1....4), the junction
temperature is also rising quickly.