參數(shù)資料
型號(hào)： L6712QTR
廠商： 意法半導(dǎo)體
英文描述： TWO-PHASE INTERLEAVED DC/DC CONTROLLER
中文描述： 兩相交錯(cuò)DC / DC控制器
文件頁數(shù)： 13/27頁
文件大?。?/td> 1074K
代理商： L6712QTR
13/27
L6712A L6712
2.Constant Current Operation
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 TON 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 reset.
Figure 6 shows this working condition.
It can be observed that the peak current (I
peak
) is greater than the I
OCPx
but it can be determined as follow:
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
output voltage reaches the under-voltage threshold (Vout
MIN
).
The maximum average current during the Constant-Current behavior results:
In this particular situation, the switching frequency results reduced. The ON time is the maximum allowed
(T
onMAX
) while the OFF time depends on the application:
Figure 6. Constant Current operation
Over current is set anyway when I
INFOx
reaches 35
μ
A (I
FB
=70
μ
A). The full load value is only a convention
to work with convenient values for I
FB
. Since the OCP intervention threshold is fixed, to modify the per-
I
peak
I
OCPx
V
-----------–
Ton
MAX
Vout
L
I
OCPx
V
-----------–
0.40 T
Vout
L
+
=
+
=
I
MAX,TOT
2 I
MAX
2
I
OCPx
Ipeak
--------------------------------------
I
–
2
+
=
=
T
OFF
L
Ipeak
-------------------------------------
f
I
–
V
OUt
T
ONmax
T
OFF
+
------------------------------------------
=
=
a) Maximum current for each phase b) Output Characteristic
TonMAX
TonMAX
I
OCPx
Ipeak
I
MAX
Vout
Iout
(I
DROOP
=50
μ
A)
2·I
OCPx
(I
DROOP
=70
μ
A)
I
MAX,TOT
UVP
Droop effect
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