L6229DP 查看數據表（PDF） - STMicroelectronics

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L6229DP

DMOS driver for 3-phase brushless DC motor

STMicroelectronics 

PWM current control

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Figure 10. Output current regulation waveforms

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Figure 11 shows the magnitude of the off time tOFF versus COFF and ROFF values. It can be

approximately calculated from the equations:

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

Therefore:

20 K  ROFF  100 K

0.47 nF  COFF  100 nF

tDT = 1 µs (typical value)

Equation 3

tOFF(MIN) = 6.6 µs

tOFF(MAX) = 6 ms

These values allow a sufficient range of tOFF to implement the drive circuit for most motors.

14/33

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