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參數(shù)資料
| 型號： | L6711TR |
| 廠商： | 意法半導體 |
| 英文描述： | 3 PHASE CONTROLLER WITH DYNAMIC VID AND SELECTABLE DACs |
| 中文描述： | 3相控制器，動態(tài)VID和可選數(shù)模轉換器 |
| 文件頁數(shù)： | 20/38頁 |
| 文件大?。?/td> | 591K |
| 代理商： | L6711TR |
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L6711
20/38
obtaining the following relationship:
where R
SENSE
is the sensing element resistance value (at T
MOS
= 25oC), B is the constant obtainable from
Figure 13, k
T
is the Temperature Coupling Coefficient between the sensing element and the Controller (it
results K
T
= (T
J
-25)/(T
MOS
-25)) and
α
is the Temperature Coefficient of the sensing element. Since R
TC
depends from the constant B depending in turn from R
TC
, an iterative process is required to properly de-
sign the R
TC
value.
As a consequence of the nature of the thermal sensor, a negative offset is needed to compensate the na-
tive offset introduced by the ITS at a referenced temperature Tref and it is obtainable by connecting a
R
OFFSET
resistor between the OFFSET pin and SGND as follow:
To disable this function, short the pin to SGND.
Figure 13. Integrated Thermal Sensor Constant vs. External resistor R
TC
9
The device is able to manage Dynamic VID Code changes that allow Output Voltage modification during
normal device operation.
OVP and UVP signals are masked during every VID transition and they are re-activated after the transition
finishes.
When changing dynamically the regulated voltage (D-VID), the system needs to charge or discharge the
output capacitor accordingly. This means that an extra-current I
D-VID
needs to be delivered, especially
when increasing the output regulated voltage and it must be considered when setting the over current
threshold. This current result:
DYNAMIC VID TRANSITION
where dV
OUT
is the selected DAC LSB (12.5mV for VRD10.x or 25mV for Hammer DAC) and T
VID
is the
time interval between each LSB transition.
R
FB
R
α
-------------------------------------------------------–
I
OUT
T
Rg
)
R
R
TC
----------
B
T
J
25
–
(
)
+
–
0
=
R
TC
R
SENSE
----------------------
B k
α
I
OUT
--------------------
=
I
OFFSET
I
TC
T
ref
(
)
–
A
----+
B
T
R
TC
)
=
=
450
475
500
525
550
575
600
625
650
0
10
20
30
40
50
60
70
80
90 100
1.50
1.60
1.70
1.80
1.90
2.00
0
10
20
30
40
50
60
70
80
90 100
A [mV] vs. R
TC
[K
] B [mV/°C] vs. R
TC
[K
]
I
D
VID
–
C
dV
dT
VID
--------------------------------------
=
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