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參數(shù)資料
| 型號： | L6714TR |
| 廠商： | 意法半導(dǎo)體 |
| 英文描述： | 4 phase controller with embedded drivers for Intel VR10, VR11 and AMD 6Bit CPUs |
| 中文描述： | 4英特爾VR10，VR11和AMD的6位嵌入式CPU的司機(jī)相控制器 |
| 文件頁數(shù)： | 51/70頁 |
| 文件大?。?/td> | 572K |
| 代理商： | L6714TR |
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L6714
Over current protection
51/70
18.1
Low side MOSFET sense over current
The device detects an Over Current condition for each phase when the current information
I
INFOx
overcomes the fixed threshold of I
OCTH
(35
μ
A Typ,). When this happens, the device
keeps the relative LS MOSFET on, also skipping clock cycles, until the threshold is crossed
back and I
INFOx
results being lower than the I
OCTH
threshold. After exiting the OC condition,
the LS MOSFET is turned off and the HS is turned on with a duty cycle driven by the PWM
comparator.
Keeping the LS on, skipping clock cycles, causes the on-time subsequent to the exit from
the OC condition, driven by the control loop, to increase. Considering now that the device
has a maximum on-time dependence with the delivered current given by the following
relationship:
Where I
OUT
is the output current (
(T
SW
=1/F
SW
). This linear dependence has a value at zero load of 0.80·T
SW
and at maximum
current of 0.40·T
SW
typical.
When the current information I
INFOx
overcomes the fixed threshold of I
OCTH
(35
μ
A Typ), the
device enters in Quasi-Constant-Current operation: the low-side MOSFET stays ON until
the current read becomes lower than I
OCPx
(I
INFOx
< I
OCTH
) skipping clock cycles. The high
side MOSFET can be then turned ON with a T
ON
imposed by the control loop after the LS
turn-off and the device works in the usual way until another OCP event is detected.
) and T
SW
is the switching period
This means that the average current delivered can slightly increase in Quasi-Constant-
Current operation since the current ripple increases. In fact, the ON time increases due to
the OFF time rise because of the current has to reach the I
OCPx
bottom. The worst-case
condition is when the ON time reaches its maximum value.
When this happens, the device works in Constant Current and the output voltage decrease
as the load increase. Crossing the UVP threshold causes the device to latch (
Figure 20
shows this working condition).
It can be observed that the peak current (I
PEAK
) is greater than I
OCPx
but it can be
determined as follow:
Where V
outMIN
is the UVP threshold, (inductor saturation must be considered). When that
threshold is crossed, all MOSFET are turned OFF and the device stops working. Cycle the
power supply or the OUTEN pin to restart operation.
The maximum average current during the Constant-Current behavior results:
T
ON max
)
0.80
T
SW
T
SW
I
DROOP
I
DROOP
0
μ
A
140
μ
A
=
0.40
=
=
I
OUT
Σ
I
PHASEx
=
I
PEAK
I
OCPx
V
-----------–
V
L
)
T
ON max
)
+
I
OCPx
V
---------–
V
L
)
0.40
T
SW
+
=
=
I
MAX tot
N
I
MAX
N
I
OCPx
I
------------------------------------
I
–
2
+
=
=
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