LNBH26 datasheet(17/38 Pages) STMICROELECTRONICS

17 / 38 page

LNBH26

Typical application circuits

Doc ID 022771 Rev 1

17/38

Figure 7.

DiSEqC 2.x application circuit

Table 6.

DiSEqC 2.x bill of material (valid for A and B channels except for C1, C4,

C7 and R1)

Component

Notes

R1 (RSEL)

SMD resistors. 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

10 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

220 µH inductor

TR1

2STR2160 or 2STF2340 or any small power PNP with IC > 250 mA, VCE > 30 V, can

be used.

Also any small power PMOS with ID > 250 mA, RDSON < 0.5Ω, VDS > 20 V, can be

used.

AM10478v1

L1-A

C3-A

Vin

12V

LNBOUT-A

LX-A

VUP-A

LNBH26

D1-A

C2-A

Vcc

D2-A

Byp

FLT

ADDR

SDA

SCL

ISEL

R1 (RSEL)

LX-B

D1-B

C2-B

C3-B

L1-B

LNBOUT-B

C5-B

DSQOUT-A

DiSEqC

Envelope

TTL

DiSEqC

22KHz

TTL

DSQIN-A

DSQIN-B

Tone enable control

VUP-B

VOUT-B

BPSW-B

DSQOUT-B

D2-B

VOUT-A

C5-A

BPSW-A

15 Ω

L2-A

TR1-A

4.7k

DETIN-A

C6-A

15 Ω

L2-B

TR1-B

DETIN-B

C6-B

4.7k

FLT

Open drains

to µController

{

2C Bus

P-GND

A-GND

D3-A

D3-B

10k

4.7k

10k

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