LNBH24L datasheet(12/25 Pages) STMICROELECTRONICS

12 / 25 page

Application circuits

LNBH24L

12/25

Doc ID 16857 Rev 2

Equation 2

Figure 5.

LNBH24L with PDC circuit for DiSEqC 1.X applications

Vin

12V

to LNB

500mA max

PDC

Vup

VoRX

EXTM

P-GND

A-GND

C10

220nF

Vcc-L

Vcc

220nF

VoTX

ISEL

R2 (RSEL)

15kOhm

Byp

C11

220nF

1N4148

*R7

22 Ohm

*C14

1nF

*R5

2.2K Ohm

3.3V

*TR1

C15

47 nF

2KOhm

*R8

150 Ohm

Vin

12V

to LNB

500mA max

PDC

Vup

VoRX

EXTM

P-GND

A-GND

P-GND

A-GND

C10

220nF

C10

220nF

Vcc-L

Vcc

220nF

Vcc-L

Vcc

220nF

VoTX

ISEL

R2 (RSEL)

15kOhm

Byp

C11

220nF

ISEL

R2 (RSEL)

15kOhm

R2 (RSEL)

15kOhm

Byp

C11

220nF

Byp

C11

220nF

C11

220nF

*R7

22 Ohm

*C14

1nF

*R5

2.2K Ohm

3.3V

*TR1

C15

47 nF

(*)OPTIONAL components.

To be used only in case

of heavy capacitive load

(*)OPTIONAL components.

To be used only in case

of heavy capacitive load

*R8

150 Ohm

LNBH24L

(sections A/B)

I2C Bus

SCL

ADDR

TTX

{

SDA

DSQIN

Tone Enable control

TTL

2.2µF

Vin

12V

to LNB

500mA max

PDC

Vup

VoRX

EXTM

P-GND

A-GND

C10

220nF

Vcc-L

Vcc

220nF

VoTX

ISEL

R2 (RSEL)

15kOhm

Byp

C11

220nF

1N4148

*R7

22 Ohm

*C14

1nF

*R5

2.2K Ohm

3.3V

*TR1

C15

47 nF

2KOhm

*R8

150 Ohm

Vin

12V

to LNB

500mA max

PDC

Vup

VoRX

EXTM

P-GND

A-GND

P-GND

A-GND

C10

220nF

C10

220nF

Vcc-L

Vcc

220nF

Vcc-L

Vcc

220nF

VoTX

ISEL

R2 (RSEL)

15kOhm

Byp

C11

220nF

ISEL

R2 (RSEL)

15kOhm

R2 (RSEL)

15kOhm

Byp

C11

220nF

Byp

C11

220nF

C11

220nF

*R7

22 Ohm

*C14

1nF

*R5

2.2K Ohm

3.3V

*TR1

C15

47 nF

(*)OPTIONAL components.

To be used only in case

of heavy capacitive load

(*)OPTIONAL components.

To be used only in case

of heavy capacitive load

(*)OPTIONAL components.

To be used only in case

of heavy capacitive load

(*)OPTIONAL components.

To be used only in case

of heavy capacitive load

*R8

150 Ohm

LNBH24L

(sections A/B)

I2C Bus

SCL

ADDR

TTX

{

SDA

I2C Bus

SCL

ADDR

TTX

{

SDA

DSQIN

Tone Enable control

TTL

DSQIN

Tone Enable control

TTL

2.2µF

Table 6.

Bill of material (valid for A and B sections unless for C1, C2, C7, C8 and C11)

Component

Notes

R2, R9, R5 (1)

1/16 W resistors. Refer to the typical application circuit for the relative values

R7 (1), R8 (1)

1/2 W resistors. Refer to the typical application circuit for the relative values

25 V electrolytic capacitor, 100 µF or higher is suitable

25 V, 220 µF electrolytic capacitor, ESR in the 100 m

Ω to 350 mΩ range

C6, C8, C10, C11, C15, C14 (1) 25 V ceramic capacitors. Refer to the typ. appl. circuit for the relative values

STPS130A or similar schottky diode with VRRM > 25 V and IF(AV) higher than:

IF(AV) > IOUT_MAX x (VUP_MAX / VIN_MIN)

STPS130A, 1N5818 or similar schottky diode with VRRM>25V. To be placed as

close as possible to VoRX pin

1N4001-07 or any similar general purpose rectifier

BAT54, STPS130A, BAT43, 1N5818, or similar schottky diode with VRRM>20V.

To be placed as close as possible to EXTM pin

1N4148 or similar

TR1 (1)

BC817 or similar NPN general-purpose transistor

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

(see Equation 2)

These components can be added to avoid any 22 kHz tone distortion due to heavy capacitive output loads. If not needed

they can be removed leaving the PDC pin floating.

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