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Low-Cost In-Circuit Programmable Quad-Supply Sequencer

2013-09-22
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In this application, an X80141 provides comparators,internal references and delay circuits to simply control sequencing of multiple DC to DC converters. In this design, a dual digitally controlled potentiometer (DCP) provides adjustment to the thresholds of two low voltage supplies. This allows the power supplies to be trimmed,either up or down, while maintaining a desirable undervoltage margin. A block diagram appears in Figure 1. The X80141 provides undervoltage thresholds for each of the monitored inputs, while the X93256 provides threshold adjustment. The X80141 internal thresholds and adjustableranges are shown in Table 1. For larger or smaller power distribution schemes, Xicor offers dual, triple and quad sequencers/supervisors.

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