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Circuit Design: Know It All by Bob Zeidman, Tim Williams, Robert Pease, Walt Kester, Ian Hickman, Bonnie Baker, Darren Ashby

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Chapter 36

Input and Output Parameters

Tim Williams

36.1 Voltage

Typically you will be designing for 230V AC in the UK and continental Europe and 115V in the US. Other countries have frustratingly minor differences. The usual supply voltage variability is ±10%, or sometimes +10%/–15%. In the UK the supply authorities are obliged to maintain their voltage at the point of connection to the customer’s premises within ±6%, to which is added an allowance for local loading effects. If the voltage tolerance is applied to the UK/Europe nominal then the input voltage range becomes 207–253V or 195–253V. This range must be handled transparently by the power supply circuitry.

To cope simultaneously with both the American supply voltage, which may drop below ...

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