L6701 datasheet(23/44 Pages) STMICROELECTRONICS

23 / 44 page

L6701

10 Output Voltage Positioning

23/44

and, multiplied by three, sourced by the FB pin (IDROOP). RFB gives the final gain to program

the desired load-line slope.

As before, the voltage positioning equations results (See Figure 9):

As a consequence:

The device forces IDROOP = ICSx3, proportional to the read current, into the feedback resistor

RFB implementing the load regulation dependence. The output characteristic vs. load current is

then given by (Offset disabled):

Where RLLDIFF is the resulting differential load-line resistance implemented by the system. The

whole power supply can be then represented by a "real" voltage generator with an equivalent

output resistance RLLDIFF and a voltage value of VID.

RFB resistor can be then designed according to the Load-Line (RLLDIFF) specifications as

follow:

where RD is typically designed to have ICS = 35µA at the maximum output current (OCP).

Table 9 contains a quick-reference guide to design applications with typical and/or differential

current sense.

Figure 9.

Fully Differential Load-Line Current-Reading (pat. pend.)

OUT

1s L

⋅

DCR

⁄

1s R

⋅

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

DCR

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

⋅⋅

DCR

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

⋅

OUT

DCR

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

⋅

OUT

VID

DROOP

⋅

–

VID

3 R

⋅

DCR

------------- IOUT

⋅⋅

–

VID

LLDIFF

OU T

⋅

–

LL DIFF

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

DCR

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

⋅

DCR1

DCR2

DCR3

CPH

PHASE3

PHASE2

PHASE1

VOUT

ICS

CS+

CS-

IDROOP

x 3

RFB

COMP

Fully Differential Current Reading

for Load-Line

CPH

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