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AN3352 датащи(PDF) 14 Page - STMicroelectronics

номер детали AN3352
подробное описание детали  Dual LNB power supply based on the LNBH24L
PDF  26 Pages
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производитель  STMICROELECTRONICS [STMicroelectronics]
домашняя страница  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

AN3352 датащи(HTML) 14 Page - STMicroelectronics

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Component selection guidelines
AN3352
14/26
Doc ID 018526 Rev 3
where RSEL is the resistor connected between ISEL and GND. The highest selectable current
limit threshold is 0.650 A typ. with RSEL = 15 kΩ.
To set the current limitation, ±15% tolerance, referred to the typical Imax current value, must
be considered. At this tolerance, the tolerance of the RSEL resistor must be added.
For example:
RSEL resistor = 15 kΩ ± 1%
To calculate the Imax(min.) and Imax(max.) values:
where:
–
15% is the LNBH24L tolerance
–
1% is the RSEL tolerance
and then:
The formula below allows correct dimensioning of the RSEL total power dissipation:
mA
666
15000
10000
)
typ
(
ax
Im
=
=
%
16
%
1
%
15
ce
TotToleran
=
+
=
mA
559
%
16
mA
666
(min)
ax
Im
=
−
=
mA
772
%
16
mA
666
(min)
ax
Im
=
+
=
Figure 7.
Typical output current limiting vs. RSEL
V
CC=12V
0
0.2
0.4
0.6
0.8
1
1.2
1.4
10
12
14
16
18
20
22
24
26
28
30
32
R
SEL [K
]
V
CC=12V
0
0.2
0.4
0.6
0.8
1
1.2
1.4
10
12
14
16
18
20
22
24
26
28
30
32
R
SEL [K
]



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