UM1756 datasheet(23/49 Pages) STMICROELECTRONICS

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UM1756

Device configuration

Advanced current control (EVAL6482H-DISC)

The following configuration gives good results with most of motors:

The impacts of the timing parameters are explained in the application note AN4158: “Peak

current control with automatic decay adjustment and predictive current control: basics and

setup”.

4.3

Overcurrent protection

The overcurrent protection monitors the drain-source voltage drop of all the external Power

MOSFETs and disables the power stage when the programmed threshold is reached.

Warning:

The overcurrent protection can be disabled setting the flag

“Over-current- shutdown”.

However it is not recommended to disable this protection.

The stall detection threshold should be just above the operating peak current of the

application. During the preliminary stages of evaluation, it can be set to the maximum value.

Figure 16. Overcurrent protection

Table 7. Voltage mode driving

Parameter

Value

Unit

Minimum ON time

s

Minimum OFF time

s

Maximum fast decay (TOFF_FAST)

s

Maximum fast decay at step change (FAST_STEP)

s

Target switching time

s

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