PWM DC Motor Regulator – Data Sheet

AS8410

Rev. 1.0, December 2000

6. Short-circuited commutator segments (dirt of the lamellas)

Handling:

a) internal setting of the set value to 100 % (cleaning of the lamellas)

b) regulation of the motor with adapted characteristic or switch off the

motor if the motor current cross over the over current threshold

c) reuse the input set value, if the short-circuit condition is over

7. Protection function for the power FET and the AS8410 itself, if the motor works as

generator due to its mechanical inertia

Handling:

a) The gate potential of the power FET is permanently monitored, if this

potential is to high in the switch off case of the driver, the power FET

gate will be protected

b) If the power FET gate is returned in the normal region (the motor speed

of the off switched motor is low enough), the normal driver function is

reused.

The figure 4.3 is showing an example of the sequence of AS8410 internal events during failures

handling procedure in a reduced time scale.

Fig. 4.3 Example of a failure handling procedure