BTS3046SDR Infineon Technologies Corporation, BTS3046SDR Datasheet - Page 17

• Manufacturer Part Number: BTS3046SDR
• Description: 46 Mohm Single Channel Smart Low Side Power Switch For 12v & 24v Application
• Manufacturer: Infineon Technologies Corporation

6.2
When switching off inductive loads with low-side switches, the Drain-Source voltage
potential, because the inductance intends to continue driving the current.
Figure 13
The BTS3046SDR is equipped with a voltage clamp mechanism that prevents the Drain-Source voltage to rise
above
Figure 14
While demagnetization of inductive loads, energy has to be dissipated in the BTS3046SDR.
This energy can be calculated by the following equation:
Following equation simplifies under assumption of R
Figure 16
Datasheet
E
E
=
=
V
1
-- -
2
LI
D(Clamp)
V
D(Clamp)
L
2
shows the inductance / current combination the BTS3046SDR can handle.
⋅
⎛
⎜
⎝
Overvoltage Protection
Output Clamp
Switching an Inductance
1
⋅
–
. See
V
---------------------------------------- - ln
---------------------------------------- -
V
bat
bat
–
–
V
Figure 13
V
R
V
bat
V
V
D(Clamp)
L
D(Clamp)
V
Clamp
bat
I
IN
D
D
5V
0
⋅
⎞
⎟
⎠
and
⎛
⎜
⎝
1
–
Figure 14
---------------------------------------- -
V
bat
R
–
L
V
⋅
D(Clamp)
I
L
for more details.
⎞
⎟
⎠
L
Drain
Source
+
= 0
I
17
L
⋅
------
R
L
L
Turn off due to
over temperature or short circuit
OutputClamp .emf
Smart low side power switch
InductiveLoad .emf
HITFET - BTS3046SDR
t
t
t
V
Protection Functions
D
Rev. 1.0, 2009-12-06
rises above battery