STMicroelectronics FlexSPIN: SPI configurable stepper and DC multi motor driver evaluation board EVAL6460 EVAL6460 Data Sheet

   

   

   

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 Doc ID 17713 Rev 1

This circuit controls an external FET to implement a switching buck regulator using a non 
linear pulse skipping control with internally generated PWM signal.

The output voltage will be externally set by a divider network connected on feedback pin. To 
reduce as much as possible the regulation voltage error L6460 has the possibility to switch 
between four regulator feedback voltage references (and, as a consequence, four under-
voltage thresholds) using serial interface. The feedback reference voltage is selected by 
writing the SelFBRef bits in the SwCtrCfg.

         

This regulator is switched off when L6460 is powered up for the first time and can be 
enabled using L6460’s SPI interface.

Here after are summarized the main features of the regulator:

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Soft start circuitry to limit inrush current flow from primary supply.

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Changeable feedback reference voltage

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Internally generated PWM (250 kHz switching frequency).

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Nonlinear pulse skipping control.

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Protected against load short circuit.

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Cycle by cycle current limiting using internal current sensor.

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Under voltage signal (both continuous and latched) accessible through SPI.