SLVAE30E February 2021 – March 2021 TPS1H000-Q1 , TPS1H100-Q1 , TPS1H200A-Q1 , TPS1HA08-Q1 , TPS25200-Q1 , TPS27S100 , TPS2H000-Q1 , TPS2H160-Q1 , TPS2HB16-Q1 , TPS2HB35-Q1 , TPS2HB50-Q1 , TPS4H000-Q1 , TPS4H160-Q1
Example specifications for a few inductive loads are shown in Table 4-2. This specification is an example of a solenoid or relay that is commonly driven in automotive or industrial applications. The following example will step through determining if TPS4H160-Q1 is capable of driving these loads with no external components. Inductive load profiles will vary over temperature, so typically the profile will be specified across the operating temperature range of the system with the worst case when the system is at its lowest temperature.
|Load #||Inductance||Resistance||Switching Frequency||VSUPPLY|
|1||205 mH||79 Ω||150 Ω||158 Ω||1 Hz||24 V|
|2||48.4 mH||50 Ω||67 Ω||69.9 Ω||1 Hz||24 V|
|3||35 mH||7.5 Ω||10 Ω||10.4 Ω||1 Hz||24 V|
With these load profiles, we can calculate the current and stored energy during the on-state and demagnetized on transition to the off-state. These parameters allow us to choose the correct high side switch that is capable of safely dissipating the stored inductive energy during switching off.