PRINCIPLES OF OPERATION
REV.-A
Constant Current Drive Circuit
The constant current drive circuit is shown in Figure 2-53 (for A-phase only), and the waveforms for each
part are shown in Figure 2-54. In Figure 2-53, the reference voltage is indicated by
V
REF
;
this voltage deter-
mines the peak current through resistance R6. Resistance R10, and capacitance C46 determine the OFF
time of the chopper.
kc
= +24V
@REFA
Figure 2-53. Constant Current Control Circuit
2-44
LQ-510
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