L6714D datasheet(32/70 Pages) STMICROELECTRONICS

32 / 70 page

Current reading and current sharing loop

L6714

32/70

Current reading and current sharing loop

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

. 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

ΣI

INFOx

( )

⁄

INFO1

PWM1 Out

From EA

INFO2

AVG

PWM2 Out

INFO3

PWM3 Out

AVG

PWM4 Out

INFO4

L6714D 데이터시트(PDF) 32 Page - STMicroelectronics