Vbb disconnect with charged inductive
load
3
high
IN
Vbb
2
4 ST
PROFET
GND
OUT 5
1
Vbb
high IN
2
4 ST
3
Vbb
PROFET
GND
1
OUT 5
Vbb
BTS 542 E2
Inductive Load switch-off energy
dissipation
E bb
EAS
IN
Vbb
ELoad
PROFET OUT
=
ST
GND
EL
ER
Energy dissipated in PROFET EAS = Ebb + EL - ER.
ELoad < EL, EL = 1/2 * L * I2L
Semiconductor Group
Page 8
8.Jan.96