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參數(shù)資料
| 型號： | L6701TR |
| 廠商： | 意法半導體 |
| 英文描述： | 3 Phase Controller for VR10, VR9 and K8 CPUs |
| 中文描述： | 3 VR10，VR9和K8處理器相控制器 |
| 文件頁數(shù)： | 32/44頁 |
| 文件大?。?/td> | 492K |
| 代理商： | L6701TR |
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13 Output voltage Monitor and Protections
L6701
32/44
inductor current, the ripple entity, when not negligible, impacts on the real OC threshold value
and must be considered.
The device detects an Over Current condition for each phase when the current information
I
ISENx
overcomes the fixed threshold of I
OCTH
. When this happens, the device keeps the
relative LS MOSFET on, also skipping clock cycles, until the threshold is crossed back and
I
ISENx
results being lower than the I
OCTH
threshold (this implies that the device limits the bottom
of each inductor current ripple). 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.
The device enters in Quasi-Constant-Current operation: the low-side MOSFETs 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.
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 (see
Section 10.5
). When this happens, the device
works in Real Constant Current and the output voltage decrease as the load increase. Crossing
the UVP threshold causes the device to latch driving high the OSC pin.
It can be observed that the peak current (I
PEAK
) is greater than I
OCPx
but it can be determined
as follow:
V
V
)
–
L
Where V
outMIN
is the UVP threshold, (inductor saturation must be considered). When that
threshold is crossed, all MOSFETs are turned off, the FAULT pin is driven high and the device
stops working. Cycle the power supply or the EN pin to restart operation.
The maximum average current during the Constant-Current behavior results (see
Figure 15
):
in this particular situation, the switching frequency for each phase results reduced. The ON time
is the maximum allowed T
ON(max)
while the OFF time depends on the application:
I
I
–
V
OUT
Figure 15. Constant Current Operation
I
PEAK
I
OCPx
------------------------------------------
T
ON max
)
+
I
OCPx
V
-----------–
0.40 T
V
L
)
SW
+
=
=
I
MAX tot
3 I
MAX
3
I
OCPx
I
-------------------------------------
I
–
2
+
=
=
T
OFF
L
------------------------------------
=
f
1
T
ON max
)
T
OFF
+
---------------------------------------------
=
V
OUT
0.40 V
IN
Constant Current (Exploded)
I
OCP
= N x I
(I
DROOP
= N x 35
μ
A)
I
OUT
UVP Threshold
Resulting Out. Char.
I
MAX,tot
Limted-T
ON
Char.
Droop Effect
Q
C
T
ON(max)
T
ON(max)
I
OCPx
I
MAX
I
PEAK
LS ON Skipping
Clock Cycles
T
SW
T
SW
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