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71M6403-IGTR Datasheet(PDF) 10 Page - Teridian Semiconductor Corporation |
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71M6403-IGTR Datasheet(HTML) 10 Page - Teridian Semiconductor Corporation |
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10 / 75 page  71M6403 Electronic Trip Unit SEPTEMBER 2006 Page: 10 of 75 © 2006 TERIDIAN Semiconductor Corporation REV 1.0 The general topology of a chopped amplifier is given in Figure 2. G - + V inp V outp V outn V inn CROSS A B A B A B A B Figure 2: General Topology of a Chopped Amplifier It is assumed that an offset voltage Voff appears at the positive amplifier input. With all switches, as controlled by CROSS in the “A” position, the output voltage is: Voutp – Voutn = G (Vinp + Voff – Vinn) = G (Vinp – Vinn) + G Voff With all switches set to the “B” position by applying the inverted CROSS signal, the output voltage is: Voutn – Voutp = G (Vinn – Vinp + Voff) = G (Vinn – Vinp) + G Voff, or Voutp – Voutn = G (Vinp – Vinn) - G Voff Thus, when CROSS is toggled, e.g. after each multiplexer cycle, the offset will alternately appear on the output as positive and negative, which results in the offset effectively being eliminated, regardless of its polarity or magnitude. The Functional Description Section contains a chapter with a detailed description on controlling the CHOP_ENA register. Temperature Sensor The 71M6403 includes an on-chip temperature sensor implemented as a bandgap reference. It is used to determine the die temperature. The MPU may request an alternate multiplexer cycle containing the temperature sensor output by asserting MUX_ALT. Reading the internal temperature sensor requires enabling the alternate multiplexer cycle. The alternate multiplexer cycle then displaces a normal I0-I5 current sensors acquisition cycle. Therefore, detection of an over current event may be delayed. INEUTRAL INEUTRAL is an analog monitor input that can be used for additional analog measurements, such as neutral current. It is sampled when the multiplexer performs an alternate multiplexer cycle. The zero reference for the INEUTRAL input is VBIAS. INEUTRAL is also routed into the comparator block where it is compared to VBIAS. External interrupt 2 should be disabled when the INEUTRAL input is used for analog measurements. |
Similar Part No. - 71M6403-IGTR |
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Similar Description - 71M6403-IGTR |
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