The circuit in Figure 1 steps down a nominal -12V to a regulated -5V. It allows -5V to come up only after a separately regulated +5V has come up, and if the +5V collapses, it automatically shuts down the -5V. This is useful in ±5V supplies for A/D and D/A converters, which often require such power-supply sequencing to avoid latchup.
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This entry was posted on Tuesday, September 4th, 2007 at 8:18 pm and is filed under dc converter, switching power supply.
