參數(shù)資料
型號(hào)： L6710
廠商： 意法半導(dǎo)體
英文描述： 6 BIT PROGRAMMABLE DUAL-PHASE CONTROLLER WITH DYNAMIC VID MANAGEMENT
中文描述： 6位可編程雙相與動(dòng)態(tài)VID管理控制器
文件頁(yè)數(shù)： 13/34頁(yè)
文件大小： 1610K
代理商： L6710
13/34
L6710
1.
This happens when the maximum ON time is reached before the current in each phase reaches I
OCPx
(I
INFOx
<35 A).
Figure 4a shows the maximum output voltage that the device is able to regulate considering the T
ON
lim-
itation imposed by the previous relationship. If the desired output characteristic crosses the T
ON
limited
maximum output voltage, the output resulting voltage will start to drop after crossing. In this case, the de-
vice doesn't perform constant current limitation but only limits the maximum ON time following the previous
relationship. The output voltage follows the resulting characteristic (dotted in Figure 4b) until UVP is de-
tected or anyway until I
FB
= 70
μ
A
T
ON
LIMITED OUTPUT VOLTAGE.
Figure 4. T
ON
Limited Operation
2.
This happens when ON time limitation is reached after the current in each phase reaches I
OCPx
(I
INFOx
>35
μ
A).
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
< 35
μ
A) skipping clock cycles. The high side mosfets can be turned
ON with a T
ON
imposed by the control loop at the next available clock cycle and the device works in the
usual way until another OCP event is detected.
This means that the average current delivered can slightly increase also in Over Current condition 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 (FAULT pin is driven high).
Figure 5 shows this working condition.
It can be observed that the peak current (Ipeak) is greater than the IOCPx but it can be determined as
follow:
CONSTANT CURRENT OPERATION
Where V
outMIN
is the minimum output voltage (VID-40% as follow).
The device works in Constant-Current, and the output voltage decreases as the load increase, until the
0.80·V
IN
0.40·V
IN
V
OUT
I
OUT
I
OCP
=2·I
OCPx
(I
FB
=70
μ
A)
T
ON
Limited Output
characteristic
0.80·V
IN
0.40·V
IN
V
OUT
I
OUT
I
OCP
=2·I
OCPx
(I
FB
=70
μ
A)
Desired Output
characteristic and
UVP threshold
Resulting Output
characteristic
a) Maximum output Voltage
b) T
ON
Limited Output Voltage
I
peak
I
OCPx
V
-----------–
Ton
MAX
Vout
L
I
OCPx
V
---------–
0.40 T
Vout
L
+
=
+
=
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