STSPIN220 datasheet(13/27 Pages) STMICROELECTRONICS

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Table 12. ON, slow decay and fast decay states

Current direction(1)

Slow decay

Fast decay (quasi-synch)

Zero (power bridge disabled)

HSX1 = OFF

LSX1 = OFF

HSX2 = OFF

LSX2 = OFF

HSX1 = OFF

LSX1 = OFF

HSX2 = OFF

LSX2 = OFF

HSX1 = OFF

LSX1 = OFF

HSX2 = OFF

LSX2 = OFF

X1 → X2

HSX1 = ON

LSX1 = OFF

HSX2 = OFF

LSX2 = ON

HSX1 = OFF

LSX1 = ON

HSX2 = OFF

LSX2 = ON

HSX1 = OFF

LSX1 = ON

HSX2 = OFF

LSX2 = OFF

X1 ← X2

HSX1 = OFF

LSX1 = ON

HSX2 = ON

LSX2 = OFF

HSX1 = OFF

LSX1 = ON

HSX2 = OFF

LSX2 = ON

HSX1 = OFF

LSX1 = OFF

HSX2 = OFF

LSX2 = ON

1. The current direction is set according toTable 9. Table 9 and Table 9. Target reference and current direction according to

sequencer value (full-step mode)Table 10. Target reference and current direction according to sequencer value (not full-step

mode) .

The reference voltage value, VREF, must be selected according to the load current target value (peak value) and

sense resistor value.

Equation 1

In choosing the sense resistor value, two main issues must be taken into account:

•

The sense resistor dissipates energy and provides dangerous negative voltages on the SENSE pins during

current recirculation. For this reason the resistance of this component should be kept low (using multiple

resistors in parallel will help to obtain the required power rating with standard resistors).

•

The lower the RSNSx value, the higher the peak current error due to noise on the VREF pin and the input

offset of the current sense comparator. Values of RSNSx that are too low must be avoided.

STSPIN220

PWM current control

DS11633 - Rev 4

page 13/27

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