BTN 7975B Infineon Technologies, BTN 7975B Datasheet - Page 19

• Manufacturer Part Number: BTN 7975B
• Manufacturer: Infineon Technologies

Specifications of BTN 7975B

• Packages: PG-TO263-7
• Operating Range: 5.5 - 28.0 V
• Rds (on) (typ): 16.0 mOhm
• Id(lim): 70.0 A
• Iq (typ): 7.0 µA
• Diagnosis: OV, OT, OC-failure flag, status flag

5.4
5.4.1
The control inputs IN and INH consist of TTL/CMOS compatible schmitt triggers with hysteresis which control the
integrated gate drivers for the MOSFETs. Setting the INH pin to high enables the device. In this condition one of
the two power switches is switched on depending on the status of the IN pin. To deactivate both switches, the INH
pin has to be set to low. No external driver is needed. The BTN7975B can be interfaced directly to a
microcontroller, as long as the maximum ratings in
5.4.2
In bridge applications it has to be assured that the highside and lowside MOSFET are not conducting at the same
time, connecting directly the battery voltage to GND. This is assured by a circuit in the driver IC, generating a so
called dead time between switching off one MOSFET and switching on the other. The dead time generated in the
driver IC is automatically adjusted to the selected slew rate.
5.4.3
In order to optimize electromagnetic emission, the switching speed of the MOSFETs is adjustable by an external
resistor. The slew rate pin SR allows the user to optimize the balance between emission and power dissipation
within his own application by connecting an external resistor
5.4.4
The status pin ST is used as a error flag output. In normal operation and load currents
current
constant current source and provides
the external resistor
Figure 12
Data Sheet
I
STx
I
can be observed on the ST output pin. In case of a fault condition the status output is connected to a
ST_error
Status Flag Diagnosis
Control and Diagnostics
Input Circuit
Dead Time Generation
Adjustable Slew Rate
Status Flag Current
Normal operation:
I
STx
R
ST
and the supply voltage. In case of current limitation the
Status Flag
output
logic
VS
ESD-ZD
I
ST_error
ST
R
. The maximum voltage at the ST pin is determined by the choice of
ST
V
ST
Chapter 4.1
19
R
SR
are not exceeded.
I
to GND.
ST_error
I
STx
Fault condition:
error flag mode
Block Description and Characteristics
High Current PN Half Bridge
Status Flag
output
logic
I
ST_error
VS
ESD-ZD
I
L
is activated for 2 *
≤ 40A a variable leakage
Rev. 1.0, 2009-03-31
ST
R
ST
BTN7975B
V
ST
t
CLS
.