L6713ATR View Datasheet(PDF) - STMicroelectronics

Part Name

Description

MFG CO.

L6713ATR

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

STMicroelectronics 

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L6713A

Current reading and current sharing loop

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:

Rg

=

-D----C----2-R---0--(-μ-M---A--A-----X----)-

⋅

I--O----U----T---(---M-----A-----X----)

N

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 AVG = 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 8.

Figure 9. Current sharing loop

IINFO1

PWM1 Out

AVG

IAVG

IINFO2

From EA

PWM2 Out

IINFO3

PWM3 Out

(PHASE2 Only when using 3-PHASE Operation)

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