Datasheet TLE6280GP

7

2007-07-19

Shoot through protection / option

As already mentioned, the device has a built-in shoot-through protection, to avoid a simulta-

neous activation of high- and low-side switch in one half-bridge.

In case there is a short circuit in the bridge, the driver will switch off all external Mosfets. If

there is still current flowing in the motor, it is possible for the user to override this shoot

through protection.

By setting the ILx to “high”, the IHx to “low” and MFP to a level above 4.5V, all external Mos-

fets will be turned on simultaneously to blow a well-dimensioned fuse. The application will be

finally disconnected in this way from battery, and thus guarantee that the motor does not ap-

ply any uncontrolled torque.

Undervoltage warning:

flag is set and will remain set until the voltage of the bootstrap capacitor has recovered.

The error signal can be seen as awarning that an undervoltage shut-down could occur soon,

and the user can take appropriate measures to avoid this. Such measures could be the

change of the duty cycle to a range of 10-90% or the ramp down of the motor.

Undervoltage shut down:

The TLE6280GP has an integrated undervoltage shut-down, to guarantee that the behavior

of the device is predictable in all voltage ranges.

Gate-Source voltage of the affected external Mosfet will be actively pulled to low. In this

situation the short circuit detection of this output stage is deactivated to avoid a complete

&

&

NAND

Vmfp x 2

MFP

Shoot

Through

80ns

1.45 /

1.7V

Gate

control

4.5V

IHx

ILx

Levelshifter

Dissable

=

Reset

Fig. 4: Block diagram of internal structure of MFP pin