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參數(shù)資料
| 型號： | L6615N |
| 廠商： | STMICROELECTRONICS |
| 元件分類： | 電源管理 |
| 英文描述： | 1-CHANNEL POWER SUPPLY SUPPORT CKT, PDIP8 |
| 封裝： | MINI, DIP-8 |
| 文件頁數(shù)： | 4/20頁 |
| 文件大?。?/td> | 394K |
| 代理商： | L6615N |
L6615
12/20
Figure 12. ADJ network
To set the RADJ value it is necessary to know the tolerance required of the power supply output voltage
(VOUT±VO); the maximum difference between master and slave output voltage is 2*VO and this amount
represents the voltage that the L6615 must be able to correct.
Now two different approaches are feasible depending on whether the SMPS (whose output current must
be shared) has to be completely designed or it is an "off the shelf" component and only the current sharing
section must be designed.
In the first case, the adjustment resistor (RADJ) can be considered as a fraction of the high resistor of the
feedback divider RH (see fig.12.a): typically the first step consist of fixing the current flowing, under steady
state condition, through the feedback divider IFB; by choosing the value for R2:
we will have:
It can be an useful rule of thumb to use RADJ lower than (or equal to) one tenth of R1, considering that, in
worst case condition, it will be:
This value must not exceed the one indicated in the "Electrical characteristic section" but this is very easy
to meet, as one can easily see by using sensible values for
VOUT and R2.
In the second case (fig 12.b), the feedback divider has been already designed by the SMPS manufacturer
and it is not possible to modify it: the design of RADJ must be done to make the L6615 able to correct the
maximum spread without significantly shifting the SMPS regulation point. A minimum RADJ value can be
found by:
where IADJ(max) is 8mA.
Especially for low voltage output buses it is important to avoid adjustment network saturation; the design
must satisfy the following relationship:
where VADJ(MIN) can be found in the "Electrical characteristic section" for different IADJ values.
V
OUT
V
REF
Off the shelf
POWER SUPPLY
R
ADJ
E/A
to L6615
ADJ pin
I
ADJ
V
OUT
V
REF
R
ADJ
E/A
to L6615
ADJ pin
I
ADJ
R
1
R
2
a)
b)
V
OUT
V
REF
Off the shelf
POWER SUPPLY
R
ADJ
E/A
to L6615
ADJ pin
I
ADJ
V
OUT
V
REF
R
ADJ
E/A
to L6615
ADJ pin
I
ADJ
R
1
R
2
a)
b)
I
FB
V
REF
R
2
--------------
=
R
H
R
1
R
ADJ
+
V
OUT
V
REF
---------------
1
–
R
2
==
I
ADJ max
()
V
OUT
R
ADJ
------------------
=
R
ADJ min
()
V
OUT
I
ADJ ma x
()
--------------------------
=
V
OUT
R
ADJ
I
ADJ
I
FB
+
() V
ADJ MIN
()
>
–
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