參數(shù)資料
型號(hào)： L6716
廠商： STMICROELECTRONICS
元件分類： 穩(wěn)壓器
英文描述： DUAL SWITCHING CONTROLLER, 225 kHz SWITCHING FREQ-MAX, QCC48
封裝： 7 X 7 MM, 1 MM HEIGHT, ROHS COMPLIANT, VFQFP-48
文件頁(yè)數(shù)： 46/57頁(yè)
文件大小： 829K
代理商： L6716
Tolerance band (TOB) definition
L6716
50/57
Doc ID 14521 Rev 3
23.2
External current sense circuit tolerance (TOBCurrSense)
It can be further sliced as follow:
Inductor DCR tolerance (kDCR). Variations in the inductor DCR impacts on the output
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 IDROOP current different 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 (kRg). Variations in the Rg resistors impacts in 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 (kNTC_0). Variations in the NTC nominal value at room 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 (kNTC). NTC variations from room to hot also impacts on the
output voltage positioning. The impact is bigger as big is the temperature variation from
room to hot (
ΔT).
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 (VAVP). Total error from external
current sense circuit results:
23.3
Time constant matching error tolerance (TOBTCMatching)
Inductance and capacitance tolerance (kL, kC). Variations in the inductance value and in the
value of the capacitor used for the time constant matching causes over/under shoots after a
load transient appliance. This impacts the output voltage and then the TOB. Since all the
sense elements results to be in parallel, the error related to the time constant mismatch has
to be divided by the number of phases (N).
Capacitance temperature variations (kCt). The capacitor used for time constant matching
also vary with temperature (
ΔT
C) impacting on the output voltage transients ad before. Since
all the sense elements results to be in parallel, the error related to the time constant
mismatch has to be divided by the number of phases (N).
All these parameters impact the dynamic AVP, so they must be weighted on the maximum
dynamic voltage swing (Idyn). Total error due to time constant mismatch results:
TOB
CurrSense
V
AVP
2
k
DCR
2
N
--------------
k
Rg
2
N
---------
k
NTC0
2
αΔTk
NTC
DCR
----------------------------------
2
++
+
=
TOB
TCMatching
V
AVPDyn
2
k
L
2
k
C
2
k
Ct
ΔTC
()
2
++
N
----------------------------------------------------------
=
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