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April. 2002 (Rev.0)
www.interpionsemi.com
AD6392
4-CH MOTOR DRIVE IC
APPLICATION SUMMARY (Continued)
Fig. 6 Operation waveforms of CH1, CH2 and CH3 drive parts
Input waveform (digital servo output).
(Pin4,5,9,10,19,20)
Output waveform at internal filter(RCIN).
(Pin3,11,18)
Final output waveform.
(Pin1,2,12,13,26,27)
- Operation principle
If FWD is high and REV is low, then SW_FWD and SW_REV become on and off, respectively.
This causes the internal capacitor to be charged with sourcing current of 22 uA and consequently the
voltage of the filter output (RCIN) increases with the internal time constant of 2.4usec (time constant =
R*C=24 pF * 100 Kohm =2.4usec). Then the output current of V-I converter is given by
The output voltages of power amplifiers are, then, given as:
di=
100
VRCIN
K
RCIN
Pref
=
DOF
+
RCIN
Pref
=
DOR
−
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