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ISL62773 Datasheet(PDF) 30 Page - Renesas Technology Corp

Part # ISL62773
Description  Multiphase PWM Regulator for AMD Fusion??Desktop CPUs Using SVI 2.0
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Manufacturer  RENESAS [Renesas Technology Corp]
Direct Link  http://www.renesas.com
Logo RENESAS - Renesas Technology Corp

ISL62773 Datasheet(HTML) 30 Page - Renesas Technology Corp

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ISL62773
FN8263 Rev 1.00
Page 30 of 37
Dec 16, 2015
Resistor Current-Sensing Network
Figure 30 shows the resistor current-sensing network for a
3-phase solution. Each inductor has a series current sensing
resistor, Rsen. Rsum and Ro are connected to the Rsen pads to
accurately capture the inductor current information. The Rsum
and Ro resistors are connected to capacitor Cn. Rsum and Cn
form a filter for noise attenuation. Equations 23 through 25 give
the VCn(s) expression.
Transfer function ARsen(s) always has unity gain at DC.
Current-sensing resistor Rsen value does not have significant
variation over-temperature, so there is no need for the NTC network.
The recommended values are Rsum = 1kΩ and Cn = 5600pF.
Overcurrent Protection
Refer to Equation 1 on page 17 and Figures 24, 28 and 30;
resistor Ri sets the droop current, Idroop. Tables 1 and 2 on
page 19 show the internal OCP threshold. It is recommended to
design Idroop without using the Rcomp resistor.
For example, the OCP threshold is 1.5V on the IMON pin. This
translates to 45µA of Isum current or 56.25µA of droop current.
Idroop is designed to be 45µA at full load, so the OCP trip level is
1.25x of the full load current.
For inductor DCR sensing, Equation 26 gives the DC relationship
of Vcn(s) and Io(s):
Substitution of Equation 26 into Equation 1 gives Equation 27:
Therefore:
Substitution of Equation 18 and application of the OCP condition
in Equation 28 gives Equation 29:
Where Iomax is the full load current and Idroopmax is the
corresponding droop current. For example, given N = 3,
Rsum = 3.65kΩ, Rp = 11kΩ, Rntcs = 2.61kΩ, Rntc = 10kΩ,
DCR = 0.9mΩ, Iomax = 65A and Idroopmax = 45µA. Equation 29
gives Ri = 359Ω.
For resistor sensing, Equation 30 gives the DC relationship of
Vcn(s) and Io(s).
Substitution of Equation 30 into Equation 1 gives Equation 31:
Therefore:
Substitution of Equation 32 and application of the OCP condition
in Equation 28 gives Equation 33:
Where Iomax is the full load current and Idroopmax is the
corresponding droop current. For example, given N = 3,
Rsen =1mΩ, Iomax = 65A and Idroopmax = 45µA, Equation 33
gives Ri = 481Ω
Load Line Slope
See Figure 16 for load line implementation.
For inductor DCR sensing, substitution of Equation 27 into
Equation 2 gives the load line slope expression in Equation 34:
For resistor sensing, substitution of Equation 31 into Equation 2
gives the load line slope expression in Equation 35:
FIGURE 30. RESISTOR CURRENT-SENSING NETWORK
CN
RSUM
RO
DCR
L
DCR
L
RSUM
RO
PHASE2 PHASE3
IO
DCR
L
PHASE1
RO
RSUM
RI
ISUM+
ISUM-
VCN
RSEN
RSEN
RSEN
+
-
VCn s

Rsen
N
------------- Io s

ARsen
s

=
(EQ. 23)
ARsen s

1
1
s
sns
-------------
+
-----------------------
=
(EQ. 24)
Rsen
1
Rsum
N
--------------- Cn
-----------------------------
=
(EQ. 25)
VCn
Rntcnet
Rntcnet
Rsum
N
---------------
+
------------------------------------------ DCR
N
-------------





Io
=
(EQ. 26)
Idroop
1
Ri
-----
Rntcnet
Rntcnet
Rsum
N
---------------
+
------------------------------------------ DCR
N
-------------
Io
=
(EQ. 27)
Ri
Rntcnet DCR
Io
NRntcnet
Rsum
N
---------------
+


Idroop
----------------------------------------------------------------------------------
=
(EQ. 28)
Ri
Rntcs Rntc
+
 R
p
Rntcs Rntc Rp
++
---------------------------------------------------- DCR
Iomax
N
Rntcs Rntc
+
 R
p
Rntcs Rntc Rp
++
----------------------------------------------------
Rsum
N
---------------
+



Idroopmax
-----------------------------------------------------------------------------------------------------------------------------
=
(EQ. 29)
VCn
Rsen
N
------------- Io
=
(EQ. 30)
Idroop
1
Ri
-----
Rsen
N
------------- Io
=
(EQ. 31)
Ri
Rsen Io
NIdroop
---------------------------
=
(EQ. 32)
Ri
Rsen Iomax
NIdroopmax
--------------------------------------
=
(EQ. 33)
LL
Vdroop
Io
-------------------
Rdroop
Ri
-------------------
Rntcnet
Rntcnet
Rsum
N
---------------
+
------------------------------------------ DCR
N
-------------
==
(EQ. 34)
LL
Vdroop
Io
-------------------
Rsen Rdroop
NRi
---------------------------------------
==
(EQ. 35)


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