AN3115 datasheet(19/28 Pages) STMICROELECTRONICS

tên linh kiện	AN3115

Giải thích chi tiết về linh kiện	LNB power supply based on the LNBH23L supply and control IC with step-up and I²C interface

PDF	28 Pages

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nhà sản xuất	STMICROELECTRONICS [STMicroelectronics]

Trang chủ	http://www.st.com

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19 / 28 page

AN3115

Component selection guidelines

Doc ID 16830 Rev 3

19/28

The formula to calculate the transistor IC current with PDC circuit is:

Equation 4

The current flows through R8, TR1 and R7 during fall time of 22 kHz tone and the power

dissipated by these passive components is 1/3 because the D.C. is 30 % (see Figure 11).

Figure 10.

Application circuit with PDC optional solution

22 µH

470 nF

220 µF

Vin

12 V

to LNB

500 mA max

BAT43

{

I2C Bus

SDA

SCL

PDC

Vup

Vcc -L

Vcc

VoRX

EXTM

ADDR

220 nF

LNBH23L

TTX

P-GND

A -GND

STPS130A

C10

220 nF

470 nF

VoTX

ISEL

R2 (RSEL)

15 kOhm

Byp

C11

220 nF

DSQIN

1N4148

*R7

22 Ohm

*C14

1 nF

*R5

2.2 kOhm

3.3 V

*TR1

BC317

C15

47 nF

1.5 kOhm

(*)OPTIONAL components.

To be used only in case

of heavy capacitive load

*R8

150 Ohm

100 nF

100 µF

1N4007

N.C.

22 µH

470 nF

220 µF

Vin

12 V

to LNB

500 mA max

BAT43

{

I2C Bus

SDA

SCL

PDC

Vup

Vcc -L

Vcc

VoRX

EXTM

ADDR

220 nF

LNBH23L

TTX

P-GND

A -GND

STPS130A

C10

220 nF

470 nF

VoTX

ISEL

R2 (RSEL)

15 kOhm

Byp

C11

220 nF

DSQIN

1N4148

*R7

22 Ohm

*C14

1 nF

*R5

2.2 kOhm

3.3 V

*TR1

BC317

C15

47 nF

1.5 kOhm

(*)OPTIONAL components.

To be used only in case

of heavy capacitive load

*R8

150 Ohm

100 nF

100 µF

1N4007

N.C.

TR1hfe

BYP

TR1hfe

BYP

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