TLE7182EM Datasheet, PDF (10/28 Pages) Infineon Technologies AG – H-Bridge and Dual Half Bridge Driver IC

H-Bridge and Dual Half Bridge Driver IC
TLE7182EM
Description and Electrical Characteristics
5
Description and Electrical Characteristics
5.1
MOSFET Driver
5.1.1 Driving MOSFET Output Stages
The TLE7182EM incorporates 2 high side and low side output stages for 4 external MOSFETs.
Unlike other H-Bridge drivers the TLE7182EM offers 4 independent control inputs to control the MOSFETs
individually. However, the control inputs for the Highs Side MOSFETs IHx are inverted. Hence, the control inputs
for High Side IHx and Low Side MOSFETs ILx of the same half bridge can be tight together to control one half
bridge by one control signal. To avoid shoot through currents within the half bridges, a minimum dead time is
provided by the TLE7182EM. Minimum dead time is only generated, if the short circuit detection is activated.
If the TLE7182EM drives a load in between the high side MOSFET and the low side MOSFET or the driver is used
to drive 4 low side MOSFETs, the short circuit detection and the minimum dead time has to be deactivated by
pulling the SCDL pin to 5V.
For more details about the dead time please see Chapter 5.1.3.
Table 3 and Table 4 show the differed states of the output stages subject to the input conditions for activated and
deactivated shout through protection.
Table 3 Truth table (shoot through active)
ENA IL1 IH1 IL2 IH2 Lowside switch1 Highside switch1 Lowside switch2 Highside switch2
0 x x x x OFF
OFF
OFF
OFF
1 0 1 0 1 OFF
OFF
OFF
OFF
1 0 0 0 0 OFF
ON
OFF
ON
1 1 1 0 0 ON
OFF
OFF
ON
1 0 0 1 1 OFF
ON
ON
OFF
1 1 1 1 1 ON
OFF
ON
OFF
Table 4 Truth table (shoot through inactive)
ENA IL1 IH1 IL2 IH2 Lowside switch1 Highside switch1 Lowside switch2 Highside switch2
0 x x x x OFF
OFF
OFF
OFF
1 0 1 0 1 OFF
OFF
OFF
OFF
1 0 0 0 1 OFF
ON
OFF
OFF
1 1 0 0 1 ON
ON
OFF
OFF
1 0 1 0 0 OFF
OFF
OFF
ON
1 0 1 1 0 OFF
OFF
ON
ON
5.1.2 MOSFET Output Stages
The six push-pull MOSFET driver stages of the TLE7182EM are realized as separate floating blocks. This means
that the output stage is follows the individual MOSFET source voltages and so ensuring stable MOSFET driving
even in harsh electrical environment.
All 4 output stages have the same output power and thanks to the used bootstrap principle they can be switched
all up to high frequencies.
Each output stage has its own short circuit detection block. For more details about short circuit detection see
Chapter 5.2.1.
Data Sheet
10
Rev 1.1, 2010-09-30