BTS 3256D Infineon Technologies, BTS 3256D Datasheet - Page 20

• Manufacturer Part Number: BTS 3256D
• Manufacturer: Infineon Technologies

Specifications of BTS 3256D

• Packages: PG-TO252-5
• Channels: 1.0
• Vds (max): 40.0 V
• Id(nom): 7.5 A
• Rds (on) (max): 10.0 mOhm
• Id(lim) (min): 42.0 A

7
The BTS3256D provides digital fault feedback on the IN pin without the need of an ADC.
Additonally the device features an adjustable slew rate via the SRP pin.
7.1
The BTS 3256D provides digital status information via an increased current on the IN / Fault pin.
The voltage on this pin is pulled down to logic low when a fitting serial resistor is used. An example for the required
circuitry is shown in
current I
A 3k3 for a 3.3V µC or 5k6 for a 5V µC is recommended.
For detailed calculation please refer to
.
Figure 14
7.2
In order to optimize electromagnitic emission, the switching speed of the MOSFET can be adjusted by connecting
an external resistor between SRP pin and GND. This allows for balancing between electromagnetic emissions and
power dissipation. R
slew rate Slew rate
A short to GND causes the minimum slew rate Slew rate
Open pin condition causes the maximum Slew rate Slew rate
Figure 15
Datasheet
IN
.
shows the relation between the resistor value and the slew rate of BTS 3256D.
Control and Diagnosis
Readout of Fault Information
Readout of feedback information and XOR logic in micro
Adjustable Slew Rate
max
Figure
GND
V
V
SRP-min
.
bb
CC
14. The increased current I
represents the minimum slew rate Slew rate
Fault
Micro
controller
0
=1
0
0
GND
“Dimensioning of serial Resistor at IN pin” on Page
V
CC
DO
DI
I
DO
V
DI
IN(fault)
R1
20
min.
is one order of magnitude above the normal operation
max
I
IN
.
IN/Fault
BTS3256
V
GND
S
min
Smart Low Side Power Switch
and R
Fault_readout . emf
SRP-max
HITFET - BTS 3256D
represents the maximum
Control and Diagnosis
Rev. 1.0, 2009-05-05
26.