L6714D datasheet(35/70 Pages) STMICROELECTRONICS

35 / 70 page

L6714

Remote voltage sense

35/70

Remote voltage sense

The device embeds a Remote Sense Buffer to sense remotely the regulated voltage without

any additional external components. In this way, the output voltage programmed is regulated

between the remote buffer inputs compensating motherboard or connector losses. It senses

the output voltage remotely through the pins FBR and FBG (FBR is for the regulated voltage

sense while FBG is for the ground sense) and reports this voltage internally at VSEN pin

with unity gain eliminating the errors. Keeping the FBR and FBG traces parallel and guarded

by a power plane results in common mode coupling for any picked-up noise.

If remote sense is not required, it is enough connecting the resistor RFB directly to the

regulated voltage: VSEN becomes not connected and still senses the output voltage

through the remote buffer. In this case the FBG and FBR pins must be connected anyway to

the regulated voltage (See Figure 10).

Warning:

The remote buffer is included in the trimming chain in order

to achieve ±0.5% accuracy (0.6% for the AMD DAC) on the

output voltage when the RB is used: eliminating it from the

control loop causes the regulation error to be increased by

the RB offset worsening the device performances.

Figure 10. Remote buffer connections

VREF

COMP

VSEN

64k

FBR

FBG

64k

RFB

To Vcore

(Remote Sense)

COMP

VSEN

64k

FBR

FBG

64k

RFB

To Vcore

Remote Buffer Used (Up to 0.5% Accuracy)

Remote Buffer NOT Used (Precision Worsened)

VREF

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