Vbb disconnect with charged inductive
load
3
high
IN
Vbb
2
ST
4
PROFET
GND
OUT
5
1
Vbb
high IN
2
ST
4
3
Vbb
PROFET
GND
1
OUT
5
Vbb
BTS 442 D2
Inductive Load switch-off energy
dissipation
E bb
IN
Vbb
E AS
ELoad
PROFET OUT
=
ST
EL
GND
ER
Energy dissipated in PROFET EAS = Ebb + EL - ER.
ELoad < EL, EL = 1/2 * L * I2L
Semiconductor Group
8