BTM 7745G Infineon Technologies, BTM 7745G Datasheet - Page 14

• Manufacturer Part Number: BTM 7745G
• Manufacturer: Infineon Technologies

Specifications of BTM 7745G

• Packages: PG-DSO-36
• Operating Range: 5.5 - 28.0 V
• Rds (on) (typ): 250.0 mOhm
• Id(lim): 12.0 A
• Iq (typ): 5.0 µA
• Diagnosis: OV-, OC-, OT-failure flag

6.3.2
To avoid uncontrolled motion of the driven motor at low voltages the device shuts off (both outputs are tri-state),
if the supply voltage
becomes active again with a hysteresis
6.3.3
The BTM7745G is protected against overtemperature by integrated temperature sensors. Each half bridge, which
consists of one high side and one low side switch, is protected by one temperature sensor located in the high side
switch. Both temperature sensors function independently. A detection of overtemperature through temperature
sensor leads to a shut down of both switches in the half bridge. This state is latched until the device is reset by a
low signal with a minimum length of
temperature has decreased at least the thermal hysteresis Δ T in the meantime.
Overtemperature protection is available up to supply voltage
For sufficient over temperature protection please consider also operation below the limitations outlined in Figure
4 and Figure 5.
Repetitive use of the overtemperature protection might reduce lifetime.
6.3.4
The current in the bridge is measured in all four switches. As soon as the current in forward direction in one switch
is reaching the limit I
half bridge is activated for the same time (
However, the INH pin can still be used to switch all MOSFETs off. After
setting. The error signal at the ST pin is reset after 1.5 *
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 I
Figure 10
Data Sheet
Undervoltage Shut Down
Overtemperature Protection
Current Limitation
Timing Diagram Current Limitation and Status Flag
I
C Lx 0
I
V
C Lx
5V
I
L
O
S T
O
CLx
V
S
, this switch is deactivated for
drops below the switch-off voltage
CLx
depends on the slew rate of the load current di/dt as shown in Figure 11.
t
C LS
t
V
reset
UV(HY)
t
simultaneously at the INH pin and both IN pins, provided that its
CLS
if the supply voltage rises above the switch-on voltage V
). During that time all changes at the related IN pin are ignored.
t
CLS
14
. In case of INH = 5V (high) the other switch of the same
t
CLS
V
UV(OFF)
V
if no overcurrent state is detected in the meantime.
S
= 18V.
. In this case all latches will be reset. The IC
Block Description and Characteristics
1. 5 *t
t
CLS
C LS
the switches return to their initial
High Current H-Bridge
Rev. 1.0, 2010-05-28
t
t
BTM7745G
UV(ON)
.