HITFET - BTS3080TF
Smart Low-Side Power Switch
Power Stage
5.3
Inductive Load
5.3.1
Output Clamping
When switching off inductive loads with low side switches, the Drain-Source voltage VOUT rises above battery
potential, because the inductance intends to continue driving the current. To prevent unwanted high voltages
the device has a voltage clamping mechanism to keep the voltage at VOUT(CLAMP). During this clamping
operation mode the device heats up as it dissipates the energy from the inductance. Therefore the maximum
allowed load inductance is limited. See Figure 11 and Figure 12 for more details.
VBAT
ZL
IL
OUT ( DMOS Drain
VOUT
GND ( DMOS Source)
IGND
Figure 11 Output Clamp Circuitry
VIN
t
IOUT
t
VOUT
VOUT(CLAMP)
VBAT
t
Figure 12 Switching an Inductive Load
Datasheet
12
Rev. 1.0
2016-06-01
INFINEON [ Infineon ]
