BTN 7973B Infineon Technologies, BTN 7973B Datasheet - Page 15

• Manufacturer Part Number: BTN 7973B
• Manufacturer: Infineon Technologies

Specifications of BTN 7973B

• Packages: PG-TO263-7
• Operating Range: 4.5 - 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

5.3
The device provides integrated protection functions. These are designed to prevent IC destruction under fault
conditions described in the data sheet. Fault conditions are considered as “outside” normal operating range.
Protection functions are not to be used for continuous or repetitive operation, with the exception of the current
limitation
connected slew rate resistor. In all other fault conditions the highest slew rate possible will be applied independent
of the connected slew rate resistor. Overvoltage, overtemperature and overcurrent are indicated by a fault current
I
Page 19
In the following the protection functions are listed in order of their priority.
5.3.1
If the supply voltage is exceeding the over voltage level
operates in normal mode again with a hysteresis
Mode OFF voltage level
current
Current Limitation and Overtemperature Protection are still active for the highside switch, and can independently
switch off the highside MOSFET, if it was on before.
If the highside MOSFET is off, an implemented voltage clamp mechanism keeps the voltage drop -
the highside at a certain level -
5.3.2
To avoid uncontrolled motion of the driven motor at low voltages the device shuts off (output is tri-state), if the
supply voltage drops below the switch-off voltage
if the supply voltage rises above the switch-on voltage
Note: With decreasing
5.3.3
The BTN7973B is protected against overtemperature by an integrated temperature sensor. Overtemperature
leads to a shut down of both output stages. This state is latched until the device is reset by a low signal with a
minimum length of
Δ
Repetitive use of the overtemperature protection impacts lifetime.
5.3.4
The current in the bridge is measured in both switches. As soon as the current in forward direction in one switch
(high side or low side) is reaching the limit
During that time all changes at the IN pin are ignored. However, the INH pin can still be used to switch both
MOSFETs off. After
Unintentional triggering of the current limitation by short current spikes (e.g. inflicted by EMI coming from the
motor) is suppressed by internal filter circuitry. Due to thresholds and reaction delay times of the filter circuitry the
effective current limitation level
Data Sheet
IS(LIM)
T
in the meantime.
Shut Down with ambient temperatures less than 25°C. See
at the IS pin as described in the paragraph
I
IS(LIM)
and
(Chapter
Protection Functions
Overvoltage mode (Smart Clamping)
Undervoltage Shut Down
Overtemperature Protection
Current Limitation
Figure
is provided at the IS pin. The highside MOSFET is still operational and follows the inputs IN and INH.
t
5.3.4). In case of overtemperature the BTN7973B will apply the slew rate determined by the
reset
t
CLS
12.
V
at the INH pin, provided that its temperature has decreased at least the thermal hysteresis
s
the switches return to their initial setting. The error signal at the IS pin is reset after 2 *
V
<
OVM(off)
V
UV(OFF)max
V
I
DS(HS)_CL
CLx
. In case of overvoltage the device shuts the lowside MOSFET off and a fault
depends on the slew rate of the load current
, activation of the Current Limitation mode may occur before Undervoltage
.
I
CLx
, this switch is deactivated and the other switch is activated for
V
V
“Status Flag Diagnosis With Current Sense Capability” on
OVM(HY)
UV(OFF)
V
15
V
UV(ON)
OVM(ON)
. The IC becomes active again with a hysteresis
if the supply voltage decreases below the Overvoltage
.
the device enters the overvoltage mode. The IC
Table “Switch-OFF Voltage” on Page
Block Description and Characteristics
High Current PN Half Bridge
dI/dt
as shown in
Rev. 1.0, 2009-09-09
Figure
BTN7973B
V
DS(HS)
V
10.
18.
UV(HY)
over
t
t
CLS
CLS
.
.