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AN2836
Designing an application with L6225, L6226, L6227
Doc ID 15084 Rev 1
21/57
Figure 15.
PWM output current regulation waveforms (L6227 only)
Figure 16 shows the magnitude of the OFF time tOFF versus COFF and ROFF values. It can
be approximately calculated from the equations:
●
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:
●
20 k
Ω ≤ R
OFF ≤ 100 kΩ
●
0.47 nF
≤ C
OFF ≤ 100 nF
●
tDT = 1 µs (typical value)
Therefore:
●
tOFF(MIN) = 6.6 µs
●
tOFF(MAX) = 6ms
These values allow a sufficient range of tOFF to implement the drive circuit for most motors.
The capacitor value chosen for COFF also affects the rise time tRCRISE of the voltage at the
pin RCA (or RCB). The rise time tRCRISE is only an issue if the capacitor is not completely
charged before the next time the monostable is triggered. Therefore, the on-time tON, which
depends on motor and supply parameters, has to be longer than tRCRISE in order to allow a
good current regulation by the PWM stage. Furthermore, the on-time tON cannot be shorter
than the minimum on-time tON(MIN).
Equation 10
Equation 11
tON tON MIN
()
>1.5
μs (typ. value)
=
tON tRCRISE tDT
–
>
⎩
⎨
⎧
t
RCRISE
600 C
OFF
⋅
=



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