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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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AN3352 датащи(PDF) 18 Page - STMicroelectronics |
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AN3352 датащи(HTML) 18 Page - STMicroelectronics |
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18 / 26 page  Component selection guidelines AN3352 18/26 Doc ID 018526 Rev 3 2.7 PDC optional external circuit This optional circuit, internally controlled by the PDC output pin, acts as an active pull-down discharging the output capacitance only when the internal 22 kHz tone is activated (TEN=TTX=1 or DSQIN=1). This optional circuit is not needed in standard applications having IOUT > 50 mA and capacitive load up to 250 nF where the PDC pin can be left floating. The formula to calculate the transistor IC current with PDC circuit is: Equation 5 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 D3 L1 Vin 12V to LNB 500mA max D2 PDC LX Vup VoRX EXTM C1 P-GND A-GND D1 C10 220nF Vcc-L Vcc C8 220nF VoTX ISEL R2 (RSEL) 15kOhm Byp C11 220nF D8 1N4148 *R7 22 Ohm *C14 1nF *R5 2.2K Ohm 3.3V *TR1 C15 47 nF R9 2KOhm *R8 150 Ohm D3 D3 L1 Vin 12V to LNB 500mA max D2 D2 PDC LX Vup VoRX EXTM C1 P-GND A-GND P-GND A-GND D1 D1 C10 220nF C10 220nF Vcc-L Vcc C8 220nF Vcc-L Vcc C8 220nF C8 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 R9 R9 (*)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 C6 2.2µF C6 C3 C3 C3 D4 D3 L1 Vin 12V to LNB 500mA max D2 PDC LX Vup VoRX EXTM C1 P-GND A-GND D1 C10 220nF Vcc-L Vcc C8 220nF VoTX ISEL R2 (RSEL) 15kOhm Byp C11 220nF D8 1N4148 *R7 22 Ohm *C14 1nF *R5 2.2K Ohm 3.3V *TR1 C15 47 nF R9 2KOhm *R8 150 Ohm D3 D3 L1 Vin 12V to LNB 500mA max D2 D2 PDC LX Vup VoRX EXTM C1 P-GND A-GND P-GND A-GND D1 D1 C10 220nF C10 220nF Vcc-L Vcc C8 220nF Vcc-L Vcc C8 220nF C8 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 R9 R9 (*)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 C6 2.2µF C6 C3 C3 C3 C6 2.2µF C6 C3 C3 C3 C3 C3 C3 D4 D4 TR1hfe R 5 R 7 V BE V D V BYP I C + - - = TR1hfe R 5 R 7 V BE V D V BYP I C + - - = |
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