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STPMS2L-PUR Datasheet(PDF) 11 Page - STMicroelectronics |
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STPMS2L-PUR Datasheet(HTML) 11 Page - STMicroelectronics |
11 / 33 page STPMS2 Application Doc ID 16525 Rev 3 11/33 5 Application The choice of external components in the transduction section of the application is a crucial point in the application design, affecting the precision and the resolution of the entire system. Among the several considerations, a compromise should be found between the following requirements: 1. Maximize the signal-to-noise ratio in the voltage and current channel 2. Choose the current-to-voltage conversion ratio Ks and the voltage divider ratio in a way that calibration can be achieved 3. Choose Ks to take advantage of the whole current dynamic range in accordance with desired maximum current and resolution. To maximize the signal-to-noise ratio of the current channel, the voltage divider resistors ratio should be as close as possible to those shown in Table 6. Figure 4 below provides a reference application schematic diagram: ● P = 64000 imp/kWh ● INOM = 5 A ● IMAX = 60 A Typical sensitivity values for the current sensors are indicated inTable 6. Figure 4. Detailed application schematic U1 STPMS2H/L 1 2 3 4 cin 5 cip 6 vin 7 vip 8 9 10 11 12 MS3 13 CLK 14 DAT 15 DATn 16 17 18 e3 19 e4 20 C5 1µ C6 1µ C14 1µ C9 1µ L LOAD N VCC CLK R7 1K 1% R6 3.3 1% R8 1K 1% C7 4.7n C8 4.7n L3 E4622_X503 R4 150k R3 150k R2 150k C3 10n R5 470 1% CLK DAT MS0 = CLK HP Ampl x 4 MS1 = 0 TC = 50 ppm/ C MS2 = 0 Voltage c hannel ON, DAT =(CLK)? bs V: bs C MS3 = 0 HardMode, BIST Mode OFF L1 1µ VL VN AM09379v1 |
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