L6713ATR datasheet(33/64 Pages) STMICROELECTRONICS

Part #	L6713ATR

Description	2/3 phase controller with embedded drivers for Intel VR10, VR11 and AMD 6 bit CPUs

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Manufacturer	STMICROELECTRONICS [STMicroelectronics]

Direct Link	http://www.st.com

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L6713A

Current reading and current sharing loop

33/64

The Rg trans-conductance resistor has to be selected using the following formula, in order

to guarantee the correct functionality of internal current reading circuitry:

Current sharing control loop reported in Figure 9: 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 8.

Figure 9.

Current sharing loop

DCR MAX

()

μA

--------------------------------

OUT MAX

()

-------------------------------

⋅

AVG

ΣI

INFOx N

⁄

INFO1

PWM1 Out

From EA

INFO2

AVG

PWM2 Out

INFO3

PWM3 Out

AVG

(PHASE2 Only when using 3-PHASE Operation)

L6713ATR Datasheet(PDF) 33 Page - STMicroelectronics