L6714 View Datasheet(PDF) - STMicroelectronics
Part Name
Description
MFG CO.
L6714
STMicroelectronics
'L6714' PDF : 70 Pages View PDF
Current reading and current sharing loop
10 Current reading and current sharing loop
L6714
L6714 embeds a flexible, fully-differential current sense circuitry that is able to read across
both low side or inductor parasitic resistance or across a sense resistor placed in series to
that element. The fully-differential current reading rejects noise and allows placing sensing
element in different locations without affecting the measurement's accuracy. The kind of
sense element can be simply chosen through the DAC/CS_SEL pin according to See
Table 10.
Current sharing control loop reported in Figure 8: it considers a current IINFOx proportional to
the current delivered by each phase and the average current IAVG = ΣIINFOx ⁄ (N). The error
between the read current IINFOx and the reference IAVG is then converted into a voltage that
with a proper gain is used to adjust the duty cycle whose dominant value is set by the
voltage error amplifier in order to equalize the current carried by each phase. Details about
connections are shown in Figure 9.
Figure 8. Current sharing loop.
AVG
IINFO1
IAVG
IINFO2
From EA
IINFO3
IINFO4
PWM1 Out
PWM2 Out
PWM3 Out
PWM4 Out
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