LNBH26 datasheet(16/38 Pages) STMICROELECTRONICS

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Typical application circuits

LNBH26

16/38

Doc ID 022771 Rev 1

Typical application circuits

Figure 6.

DiSEqC 1.x application circuit

Table 5.

DiSEqC 1.x bill of material (valid for A and B channels except for C1, C4,

C7 and R1)

Component

Notes

R1 (RSEL)

SMD resistor. Refer to

Table 13 and ISEL pin description in Table 2

C1, C2

> 25 V electrolytic capacitor, 100 µF is suitable

From 470 nF to 2.2 µF ceramic capacitor. Higher values allow lower DC-DC noise.

From 100 nF to 220 nF ceramic capacitor. Higher values allow lower DC-DC noise.

C4, C7

220 nF ceramic capacitors

STPS130A or similar schottky diode

BAT54, BAT43, 1N5818, or any low power schottky diode with IF (AV) > 0.2 A,

VRRM > 25 V, VF < 0 .5 V . To be placed as close as possible to VOUT pin

1N4001-07, S1A-S1M, or any similar general purpose rectifier

10 µH inductor with Isat > Ipeak where Ipeak is the boost converter peak current

AM10477v1

C3-A

Vin

12V

LNBOUT-A

LX-A

VUP-A

LNBH26

D1-A

C2-A

Vcc

Byp

FLT

ADDR

{

2C Bus

SDA

SCL

ISEL

R1 (RSEL)

LX-B

D1-B

C2-B

C3-B

LNBOUT-B

C5-B

DiSEqC

Envelope

TTL

DiSEqC

22KHz

TTL

VUP-B

VOUT-B

VOUT-A

C5-A

D2-A

D2-B

DSQIN-A

DSQIN-B

Tone enable control

P-GND

A-GND

D3-A

D3-B

L1-A

L1-B

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