L6714TR STMicroelectronics, L6714TR Datasheet - Page 62

• Manufacturer Part Number: L6714TR
• Description: IC CTRLR 4PHASE W/DRVRS 64-TQFP
• Manufacturer: STMicroelectronics

Specifications of L6714TR

• 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
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: 497-5095-2

Tolerance band (TOB) definition
23.2
62/70
Ext. current sense circuit tolerance
(TOB CurrSense - Inductor Sense)
It can be further sliced as follow:
●
●
●
●
●
Inductor DCR Tolerance (k
voltage since the device reads a current that is different from the real current flowing
into the sense element. As a results, the controller will source a I
from the nominal. The results will be an AVP different from the nominal in the same
percentage as the DCR is different from the nominal. Since all the sense elements
results to be in parallel, the error related to the inductor DCR has to be divided by the
number of phases (N).
Trans-conductance resistors tolerance (k
the current reading circuit gain and so impacts on the output voltage. The results will be
an AVP different from the nominal in the same percentage as the Rg is different from
the nominal. Since all the sense elements results to be in parallel, and so the three
current reading circuits, the error related to the Rg resistors has to be divided by the
number of phases (N).
NTC Initial Accuracy (k
temperature used for the thermal compensation impacts on the AVP in the same
percentage as before. In addition, the benefit of the division by the number of phases N
cannot be applied in this case.
NTC Temperature Accuracy (k
the output voltage positioning. The impact is bigger as big is the temperature variation
from room to hot ( T).
All these parameters impacts the AVP, so they must be weighted on the maximum
voltage swing from zero load up to the maximum electrical current (V
from external current sense circuit results:
TOB
CurrSense
NTC_0
=
DCR
V
2
AVP
). Variations in the NTC nominal value at room
). Variations in the inductor DCR impacts on the output
NTC
). NTC variations from room to hot also impacts on
k
------------- -
2
DCR
N
+
Rg
k
-------- -
). Variations in the Rg resistors impacts in
N
2
Rg
+
k
2
NTC0
+
-------------------------------------- -
DCR
T
DROOP
k
NTC
AVP
current different
2
). Total error
L6714