BTN 7970B Infineon Technologies, BTN 7970B Datasheet - Page 19

• Manufacturer Part Number: BTN 7970B
• Manufacturer: Infineon Technologies

Specifications of BTN 7970B

• 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, current sense

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 BTN7970 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 IS is used as a combined current sense and error flag output. In normal operation (current sense
mode), a current source is connected to the status pin, which delivers a current proportional to the forward load
current flowing through the active high side switch. If the high side switch is inactive or the current is flowing in the
reverse direction no current will be driven except for a marginal leakage current
determines the voltage per output current. E.g. with the nominal value of 19.5k for the current sense ratio
k
is connected to a current source which is independent of the load current and provides
voltage at the IS pin is determined by the choice of the external resistor and the supply voltage. In case of current
limitation the
Figure 12
Data Sheet
ILIS
=
I
L
/
I
IS
I
IS
, a resistor value of
current sense mode
I
Status Flag Diagnosis With Current Sense Capability
Control and Diagnostics
Input Circuit
Dead Time Generation
Adjustable Slew Rate
Sense Current and Fault Current
I
~ I
IS(lim)
Normal operation:
IS(lim)
Load
is activated for 2 *
Sense
output
logic
VS
ESD-ZD
R
IS
Chapter 4.1
= 1 kΩ leads to
t
CLS
IS
.
R
IS
are not exceeded.
V
V
IS
IS
= (
19
I
L
/
19.5
R
SR
I
IS
A)V. In case of a fault condition the status output
to GND.
I
~ I
IS(lim)
Fault condition:
error flag mode
Load
Block Description and Characteristics
High Current PN Half Bridge
Sense
output
logic
VS
I
ESD-ZD
IS(LK)
. The external resistor
I
Rev. 1.1, 2007-11-21
IS(lim)
IS
R
. The maximum
IS
BTN7970
V
IS
R
IS