13.5V high side over-current protection and thermal shutdown with restart using PROFET™ BTS4140N

Open online SPICE simulator circuit link: atv_bp_13.5V_high_side_BTS4140N_protection_OC_TR.tsc

PROFET™ Automotive Smart High-Side Switch BTS4140N:
Protection Features - Thermal Shutdown With Restart and
Current Limitation

{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:= 13.5 {use 12 ... 60}

{normal operation, see datasheet section 5.5}

{Thermal model number: }
ThermalModel:= 2 {use 1 ... 5}
{1 ... 4 with thermal simulation}
{5 no thermal consideration, only check current limitation}

The BTS4140N is an Automotive qualified single channel Smart High-Side Power Switch
with 1 Ω on state resistance. It is equiped with diverse protection features. Infineon’s
PROFET™ protected high-side switches drive resistive, capacitive as well as inductive loads .

This circuit demonstrates the thermal shutdown with restart and the current limitation protection
features of the BTS4140N. Many other PROFET™ devices provide similar protection features.

The load current is limited to the peak short circuit current IL_SCp. The junction temperature
is rising dramatically due to over current issue. 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.

In current limitation mode, the Vds of the internal MOSFET will be clamped by the internal
clamping diode, see VON(CL). Details can be found in the block diagram on the datasheet.

Thermal model discription:
Thermal Model = 1: 1S0P PCB 600mm2
Thermal Model = 2: 1S0P PCB 300mm2
Thermal Model = 3: 1S0P PCB minimum footprint
Thermal Model = 4: 2S2P PCB
Thermal Model = 5: no thermal consideration