AN3115 datasheet(14/28 Pages) STMICROELECTRONICS

Part #	AN3115

Description	LNB power supply based on the LNBH23L supply and control IC with step-up and I짼C interface

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14 / 28 page

Component selection guidelines

AN3115

14/28

Doc ID 16830 Rev 3

2.2

Output current limit selection (R2-RSEL)

The linear regulator current limit threshold can be set through an external resistor connected

to the ISEL pin. The resistor value defines the typical output current threshold limit by the

equation:

Equation 2

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 LNBH23L tolerance

–1 % is the RSEL tolerance

Table 6.

Recommended Inductors

Vendor

Part number

ISAT (A)

DRC (m?)

Mounting type

Sumida

CD104-220MC

RHC110-220M

1.6

2.4

67

88

SMD

Through-hole

Toko

822LY-220K

824LY-220K

A671HN-220L

A814LY-220M

1.3

1.72

2.44

2.0

70

76

21

75

Through-hole

SMD

Panasonic

ELC08D220E

ELC10D220E

1.8

3.2

51

40

Through-hole

Coilcraft

DC1012-223

PVC-0-223-03

DO3316P-223

2.5

3

2.6

46

35

85

Through-hole

SMD

Rsel

A

ax

10000

)

(

Im

=

mA

666

15000

10000

)

typ

(

ax

Im

=

%

16

%

1

%

15

ce

TotToleran

=

+

=

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