L6714 STMicroelectronics, L6714 Datasheet - Page 35

• Manufacturer Part Number: L6714
• Description: IC CTRLR 4PH W/DRIVERS 64-TQFP
• Manufacturer: STMicroelectronics

Specifications of L6714

• Applications: Controller, Intel VR10, VR11, AMD CPU
• Voltage - Input: 12V
• Number Of Outputs: 4
• Voltage - Output: 0.3 ~ 1.6 V
• Operating Temperature: 0°C ~ 70°C
• Mounting Type: Surface Mount
• Package / Case: 64-TQFP Exposed Pad, 64-eTQFP, 64-HTQFP, 64-VQFP
• Mounting Style: SMD/SMT
• Case: QFP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

L6714
11
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 R
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
Figure 10. Remote buffer connections
FB
Warning:
Remote Buffer Used (Up to 0.5% Accuracy)
V
REF
R
R
FB
F
COMP
C
F
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.
(See Figure
VSEN
64k
64k
10).
FBR
(Remote Sense)
To Vcore
FBG
FB
Remote Buffer NOT Used (Precision Worsened)
V
REF
R
R
FB
F
COMP
C
F
VSEN
Remote voltage sense
To Vcore
FB
directly to the
64k
64k
FBR
35/70
FBG