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)： 16/57頁(yè)
文件大?。?/td> 829K
代理商： L6716
L6716
Current reading and current sharing loop
Doc ID 14521 Rev 3
23/57
9
Current reading and current sharing loop
L6716 embeds a flexible, fully-differential current sense circuitry that is able to read across
inductor parasitic resistance or across a sense resistor placed in series to the inductor
element. The fully-differential current reading rejects noise and allows placing sensing
element in different locations without affecting the measurement's accuracy.
Reading current across the inductor DCR, the current flowing trough each phase is read
using the voltage drop across the output inductor or across a sense resistor in its series and
internally converted into a current. The trans-conductance ratio is issued by the external
resistor Rg placed outside the chip between CSx- pin toward the reading points.
The current sense circuit always tracks the current information, no bias current is sourced
from the CSx+ pin: this pin is used as a reference keeping the CSx- pin to this voltage. To
correctly reproduce the inductor current an R-C filtering network must be introduced in
parallel to the sensing element.
The current that flows from the CSx- pin is then given by the following equation (see
Where IPHASEx is the current carried by the relative phase.
Figure 7.
Current reading connections
Considering now to match the time constant between the inductor and the R-C filter applied
(Time constant mismatches cause the introduction of poles into the current reading network
causing instability. In addition, it is also important for the load transient response and to let
the system show resistive equivalent output impedance), it results:
Where IINFOx is the current information reproduced internally.
The Rg trans-conductance resistor has to be selected using the following formula, in order
to guarantee the correct functionality of internal current reading circuitry:
Where IOUT
MAX is the maximum output current, DCRMAX the maximum inductor DCR and N
number of phases.
I
CSx-
DCR
Rg
-------------
1
s L
DCR
()
+
1s R C
+
------------------------------------------- I
PHASEx
=
Lx
CSx+
CSx-
PHASEx
DCRx
R
C
Rg
I
PHASEx
Inductor DCR Current Sense
ICSx-=IINFOx
NO Bias
L
DCR
-------------
RC
I
CSx-
DCR
Rg
------------- I
PHASEx
=
I
INFOx
I
INFOX
DCR
Rg
------------- I
PHASEx
=
==
Rg
DCR
MAX
20
μA
------------------------
I
OUTMAX
N
--------------------------
=
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參數(shù)描述
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