BTM7752G Datasheet, PDF (22/25 Pages) Infineon Technologies AG – High Current H-Bridge Trilith IC 3G

High Current H-Bridge
BTM7752G
Application Information
It is recommended to do the freewheeling in the low side path to ensure a proper function and avoid unintended
overtemperature detection and shutdown. For proper operation it is also recommended to put a pull-down resistor
R_Dx on each output OUTx to GND with a value in the range of e.g. 1...10 kΩ. These resistors can also be used for
open load detection.
Considerations for Open Load Detection Mode
As mentioned in Chapter 6.4.1 both high side switches can be switched on independently while all other switches
are off. This will be realized by setting the corresponding IN signal to high while INH and the other IN are low.
Device State
Inputs
Outputs
Mode
INH IN1 IN2 HS1 LS1 HS2 LS2 IS
Open-Load detection 0 0
1
OFF OFF ON OFF CS HS2¹⁾ HS2 active
mode
01
0
ON OFF OFF OFF CS HS1¹⁾ HS1 active
01
1
ON OFF ON OFF CS²⁾
both HSx are active
1) Previous current sense assignment to be reset by IN1=IN2=low and both high side switches off (see Chapter 6.4.3)
2) When both high side switches are in on state, the CS provides the sense signal for the high side switch, which has been
turned on at first.
Together with the recommended pull-down resistors on the outputs OUTx to GND this provides the possibility to
do an open load detection in H-bridge configuration.
In case of one high side is active while the other half bridge is off (HS off and LS off) a current of up to 2mA will
be sourced out of the OUT of the high ohmic half bridge. This has to be considered while choosing the right value
of the pull-down resistor.
Data Sheet
22
Rev. 2.0, 2010-05-28