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)： 22/57頁(yè)
文件大小： 829K
代理商： L6716
L6716
Output current monitoring (IMON)
Doc ID 14521 Rev 3
29/57
13
Output current monitoring (IMON)
The device sources from IMON pin a current proportional to the load current (the sourced
current is a copy of Droop current).
Connect IMON pin through a RIMON resistor to remote ground (GND core) to implement a
load indicator, as shown in Figure 14.
As Intel VR11.1 specification required, on the IMON voltage as to be added a small positive
offset to avoid under-estimation of the output load (due to elements accuracy).
The voltage across IMON pin is given by the following formula:
where:
The IMON pin voltage is clamped to 1.100 V max to preserve the CPU from excessive
voltages as Intel VR11.1 specification required.
Figure 14.
Output monitoring connection (left) and thermal compensation (right)
Current sense element (DCR inductor) has a non-negligible temperature variation. As a
consequence, the sensed current is subjected to a measurement error that causes the
monitoring voltage to vary accordingly.
To recover from this temperature related error, NTC resistor can be added into monitoring
network, as shown in Figure 14.
The monitoring voltage is then driven by the following relationship (neglecting the offset term
for simplicity):
where now the RIMON is the equivalent monitoring resistor and it depends on the
temperature through NTC resistor.
Considering the relationships between IDROOP and the IOUT, the voltage results:
where T is the temperature.
V
MONITORING
R
IMON
R
OS
R
IMON
R
OS
+
----------------------------------- I
DROOP
V
REF
R
IMON
R
IMON
R
OS
+
-----------------------------------
+
=
I
DROOP
DCR
Rg
------------- I
OUT
=
I
DROOP
IMON
To GND_core
(Remote Sense)
NTC
R1
R3
R2
CIMON
VREF = +3V3
RIMON_OS
RIMON
To CPU
I
DROOP
IMON
To GND_core
(Remote Sense)
CIMON
VREF = +3V3
RIMON_OS
RIMON
To CPU
V
MONITORING
R
IMON
R
OS
R
IMON
R
OS
+
----------------------------------- I
DROOP
R
IMON
R
OS
R
IMON
R
OS
+
-----------------------------------
DCR
Rg
------------- I
OUT
==
V
MONITORING
TI
OUT
(,
)
[]
R
IMON TROS
R
IMON TROS
+
----------------------------------------------
DCR T
[]
Rg
---------------------- I
OUT
=
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