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LNBH21 数据表(PDF) 4 Page - STMicroelectronics |
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LNBH21 数据表(HTML) 4 Page - STMicroelectronics |
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4 / 20 page  LNBH21 4/20 TYPICAL APPLICATION CIRCUITS Application Circuit for DiSEqC 1.x and Output Current < 450 mA Full Application Circuit for Bi-directional DiSEqC 2.0 and Output Current up to 750mA (*) Filter to be used according to EUTELSAT recommendation to implement the DiSEqCTM 2.0, (see DiSEqCTM implementation on page 8). If bidirectional DiSEqCTM 2.0 is not implemented it can be removed both with C8 and D4. (**) Do not leave these pins floating if not used. (***) To be soldered as close as possible to relative pins. -C8 and D3,4 are needed only to protect the output pins from any negative voltage spikes during high speed voltage transitions. LNBH21 19 17 Vin 12V L1=22µH 16 18 4 2 9 C8(***) 10nF VoTX SDA SCL 15 DSQIN(**) 7 8 C5 470nF GND 0<VADDR<VBYP 5 Rsc 0.1 Ω Ω Ω Ω C3(***) 470nF Ceramic D1 1N4001 C1 220µF C4(***) 470nF Ceramic D2(***) BAT43 IC1 STS4DNFS30L 3 12 13 14 IC2 C2 220µF C9 100µF Ferrite Bead Filter F1 F1 suggested part number: MURATA BL01RN1-A62 Panasonic EXCELS A35 EXTM DSQOUT (**) DETIN VoRX to LNB ISEL Byp Tone Enable Set TTX=1 SENSE GATE Vup Address LNBH21 19 17 Vin 12V L1=22µH 16 18 4 2 9 C8(***) 10nF VoTX SDA SCL 15 DSQIN(**) 7 8 C5 470nF GND 0<VADDR<VBYP 5 Rsc 0.1 Ω Ω Ω Ω C3(***) 470nF Ceramic D1 1N4001 C1 220µF C4(***) 470nF Ceramic D2(***) BAT43 IC1 STS4DNFS30L 3 12 13 14 IC2 C2 220µF C2 220µF C9 100µF Ferrite Bead Filter F1 F1 suggested part number: MURATA BL01RN1-A62 Panasonic EXCELS A35 EXTM DSQOUT (**) DETIN VoRX to LNB ISEL Byp Tone Enable Set TTX=1 SENSE GATE Vup Address 22KHz Tone Enable 270µH 15 ohm (*) see note LNBH21 Vup Gate Vin 12V L1=22µH Sense Vcc VoRX VoTX (**) DETIN C7(***) 100nF to LNB SDA SCL DSQOUT DSQIN (**) ADDRESS Byp C5 470nF GND 0<VADDR<VBYP EXTM C6 10nF Rsc 0.05Ω Ω Ω Ω C3(***) 470nF Ceramic D2 1N4001 C1 220µF C4(***) 470nF Ceramic D3(***) BAT43 D1 1N5821 or STPS3L40A IC1 MOS STN4NF03L D4(***) BAT43 C8(***) 100nF ISEL C2 220µF C9 100µF F1 Axial Ferrite Bead Filter F1 suggested part number: MURATA BL01RN1-A62 Panasonic EXCELS A35 Higher current limit Lower current limit Floating or V>3.3V GND 22KHz Tone Enable 270µH 15 ohm (*) see note LNBH21 Vup Gate Vin 12V L1=22µH Sense Vcc VoRX VoTX (**) DETIN C7(***) 100nF to LNB SDA SCL DSQOUT DSQIN (**) ADDRESS Byp C5 470nF GND 0<VADDR<VBYP EXTM C6 10nF Rsc 0.05Ω Ω Ω Ω C3(***) 470nF Ceramic D2 1N4001 C1 220µF C4(***) 470nF Ceramic D3(***) BAT43 D1 1N5821 or STPS3L40A IC1 MOS STN4NF03L D4(***) BAT43 C8(***) 100nF ISEL C2 220µF C9 100µF F1 Axial Ferrite Bead Filter F1 suggested part number: MURATA BL01RN1-A62 Panasonic EXCELS A35 Higher current limit Lower current limit Floating or V>3.3V GND 270µH 15 ohm (*) see note LNBH21 Vup Gate Vin 12V L1=22µH Sense Vcc VoRX VoTX (**) DETIN C7(***) 100nF to LNB SDA SCL DSQOUT DSQIN (**) ADDRESS Byp C5 470nF GND 0<VADDR<VBYP 0<VADDR<VBYP EXTM C6 10nF Rsc 0.05Ω Ω Ω Ω C3(***) 470nF Ceramic D2 1N4001 C1 220µF C4(***) 470nF Ceramic D3(***) BAT43 D1 1N5821 or STPS3L40A IC1 MOS STN4NF03L D4(***) BAT43 C8(***) 100nF ISEL C2 220µF C2 220µF C9 100µF F1 Axial Ferrite Bead Filter F1 suggested part number: MURATA BL01RN1-A62 Panasonic EXCELS A35 Axial Ferrite Bead Filter F1 suggested part number: MURATA BL01RN1-A62 Panasonic EXCELS A35 Higher current limit Lower current limit Floating or V>3.3V GND |
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