L6208Q View Datasheet(PDF) - STMicroelectronics

Part Name

Description

MFG CO.

L6208Q

DMOS driver for bipolar stepper motor

STMicroelectronics 

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L6208Q

Circuit description

,287

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Figure 13. Output current regulation waveforms

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Figure 14 shows the magnitude of the OFF time tOFF versus COFF and ROFF values. It can

be approximately calculated from Equation 1 and Equation 2:

Equation 1

tRCFALL = 0.6 · ROFF · COFF

tOFF = tRCFALL + tDT = 0.6 · ROFF · COFF + tDT

where ROFF and COFF are the external component values and tDT is the internally generated

deadtime with:

Equation 2

20 kROFF 100 k

0.47 nF COFF 100 nF

tDT = 1 µs (typical value)

therefore:

Equation 3

tOFF(MIN) = 6.6 µs

tOFF(MAX) = 6 ms

DocID018710 Rev 3

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