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LNBH23L Datasheet(PDF) 12 Page - STMicroelectronics |
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LNBH23L Datasheet(HTML) 12 Page - STMicroelectronics |
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12 / 25 page  Typical application circuit LNBH23L 12/25 Doc ID 15335 Rev 4 Figure 5. DiSEqC 1.x using external 22 kHz tone generator source through EXTM pin L1 C6 470nF D3 Vin 12V to LNB 500mA max D2 LX Vup VoRX C1 LNBH23L P-GND A -GND D1 C10 220nF C4 470nF VoTX I2C Bus SCL EXTM ADDR TTX C15 220nF 22KHz signal source { SDA PDC ISEL Byp C11 220nF DSQIN C3 Vcc-L Vcc C8 220nF L1 C6 D3 D3 Vin 12V to LNB 500mA max D2 D2 C1 LNBH23L D1 D1 C10 220nF C10 220nF C4 470nF C4 470nF I2 C15 220nF C15 220nF 22KHz signal source { PDC ISEL C11 220nF DSQIN PDC ISEL R2 (RSEL) 15kOhm DSQIN L1 C6 470nF D3 Vin 12V to LNB 500mA max D2 LX Vup VoRX C1 LNBH23L P-GND A -GND D1 C10 220nF C4 470nF VoTX I2C Bus SCL EXTM ADDR TTX C15 220nF 22KHz signal source { SDA PDC ISEL Byp C11 220nF DSQIN C3 Vcc-L Vcc C8 220nF L1 C6 D3 D3 Vin 12V to LNB 500mA max D2 D2 C1 LNBH23L D1 D1 C10 220nF C10 220nF C4 470nF C4 470nF D1 D1 C10 220nF C10 220nF C4 470nF C4 470nF I2 C15 220nF C15 220nF 22KHz signal source { PDC ISEL C11 220nF DSQIN PDC ISEL R2 (RSEL) 15kOhm DSQIN Table 5. BOM list 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 C1 25 V electrolytic capacitor, 100 µF or higher is suitable C3 25 V, 220 µF electrolytic capacitor, ESR in the 100 m Ω to 350 mΩ range C4, C6, C8, C10, C11, C15, C14 (1) 25 V ceramic capacitors. Refer to the typ. appl. circuit for the relative values D1 STPS130A or any similar schottky diode with VRRM > 25 V and IF(AV) higher than: IF(AV) > IOUT_MAX x (VUP_MAX/VIN_MIN) D2 BAT43, 1N5818, or any schottky diode with IF(AV) > 0.2 A, VRRM > 25 V, VF < 0.5 V. To be placed as close as possible to VoRX pin D3 1N4001-07 or any similar general purpose rectifier TR1 (1) BC817 or similar NPN general-purpose transistor. L1 22 µH inductor with ISAT > IPEAK where IPEAK is the boost converter peak current (see Equation 1) 1. 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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