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)： 14/34頁(yè)
文件大?。?/td> 1610K
代理商： L6710
L6710
14/34
output voltage reaches the under-voltage threshold (V
outMIN
). When this threshold is crossed, all mosfets
are turned off, the FAULT pin is driven high and the device stops working. Cycle the power supply to re-
start operation.
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
(TonMAX) while the OFF time depends on the application:
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 percentage with respect to the load value, it can be simply considered that,
for example, to have on OCP threshold of 200%, this will correspond to I
INFOx
= 35
μ
A (I
FB
= 70
μ
A). The
full load current will then correspond to I
INFOx
= 17.5
μ
A (I
FB
= 35
μ
A).
Figure 5. Constant Current operation
INTEGRATED DROOP FUNCTION
The device uses a droop function to satisfy the requirements of high performance microprocessors, re-
ducing the size and the cost of the output capacitor.
This method "recovers" part of the drop due to the output capacitor ESR in the load transient, introducing
a dependence of the output voltage on the load current: the regulated voltage decrease as the load in-
crease with a precise relationship.
As shown in figure 6, the ESR drop is present in any case, but using the droop function the total deviation
of the output voltage is minimized. A static error (V
DROOP
in figure 6) at zero load is simply introduced by
a resistor between FB and GND allowing to exploit the all tolerance interval available. This additional re-
sistor is not required in application such as VRD10 since the nominal value is already set by the VID* and
the load regulation fixed by the specs.
Since the device has an average current mode regulation, the information about the total current delivered
I
MAX,TOT
2 I
MAX
2
I
OCPx
Ipeak
-------------------------------------
I
–
2
+
=
=
T
OFF
L
Ipeak
-------------------------------------
f
I
–
V
OUt
T
ONmax
T
OFF
+
-----------------------------------------
=
=
TonMAX
TonMAX
I
OCPx
Ipeak
I
MAX
Vout
Iout
(I
FB
=50
μ
A)
2·I
OCPx
(I
FB
=70
μ
A)
I
MAX,TOT
UVP
Droop effect
a) Maximum current for each phase
b) Output Characteristic
相關(guān)PDF資料
PDF描述
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