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參數(shù)資料
| 型號： | L6701TR |
| 廠商： | STMICROELECTRONICS |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 1.5 A SWITCHING REGULATOR, 110 kHz SWITCHING FREQ-MAX, PDSO36 |
| 封裝： | LEAD FREE, SSO-36 |
| 文件頁數(shù)： | 15/44頁 |
| 文件大?。?/td> | 627K |
| 代理商： | L6701TR |
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10 Output Voltage Positioning
L6701
22/44
=>
The device forces IDROOP = ICSx3, proportional to the read current, into the feedback resistor
RFB implementing the load regulation dependence. The output characteristic vs. load current is
then given by (Offset disabled):
Where RLL is the resulting load-line resistance implemented by the system.
The whole power supply can be then represented by a "real" voltage generator with an
equivalent output resistance RLL and a voltage value of VID.
RFB resistor can be then designed according to the RLL specifications as follow:
where RD is typically designed to have ICS = 35A at the maximum output current (OCP).
Caution:
Droop function is optional, in case it is not desired, the Current Sense circuit can be modified so
that the device always read a null current (See Figure 8). To do this, it is enough to connect
CS+ directly to the output voltage leaving CS- unconnected. The reaction will keep CS+ and
CS- at the same voltage, always reading a null current and also assuring the FB disconnection
protection to be effective.
Figure 8.
Droop Function Current Reading Network
10.2
Fully-Differential Load-Line (Droop Function - Optional)
Fully-Differential current-reading for voltage-positioning allows the designer to save time in the
application fine-tuning since the BOM so obtained becomes layout-independent. The patent-
pending topology offered by L6701 allow implementing fully-differential current-sense still using
only two current-sense pins (CS+ and CS-). Figure 9 shows the typical Current-Sense Circuit
used to implement the Fully-Differential Droop-Function. The current flowing across the three
inductors is read through an RPH - CPH filter for each phase as well as an RD is required for
each phase to program the trans-conductance-gain. As previously mentioned, a current ICS
proportional to the average of the currents of the three phases is internally generated, mirrored
L
DCR
-------------
R
PH
C
PH
3
---------------------------
=
I
CS
I
OUT
3
------------
DCR
R
D
-------------
=
V
OUT
VID
R
FB
I
DROOP
–
VID
R
FB
DCR
R
D
------------- IOUT
–
VID
R
LL
I
OUT
–
==
=
R
FB
R
LL
R
D
DCR
-------------
=
L2
L1
L3
DCR1
DCR2
DCR3
CPH
R
PH
R
PH
R
PH
RD
PHASE3
PHASE2
PHASE1
VOUT
ICS
CS+
CS-
FB
IDROOP
x 3
RF
CF
RFB
COMP
L2
L1
L3
DCR1
DCR2
DCR3
PHASE3
PHASE2
PHASE1
VOUT
ICS
CS+
CS-
FB
IDROOP
x 3
RF
CF
RFB
COMP
Droop Function Enabled
Droop Function Disabled
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| L6712D | 2 A SWITCHING CONTROLLER, PDSO28 |
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