DC511A

DC511A demonstration circuit shows how a power supply’s conducted and radiated EMI can be reduced significantly by using the LT3439 to control the voltage and current slew rates of its internal power switches. DC511 employs a push-pull topology which is inherently less noisy than most other topologies and the high frequency EMI is reduced by as much as 40dB by slewing the switching currents and voltages. The design is well suited to noise sensitive systems such as medical instruments, industrial sensing and control, data conversion and wide band communications. DC511 produces isolated 12Vout and -12Vout at up to 80mA each from 5Vin. The board can be modified, by changing the transformer, to produce output voltages less than input voltage. Output voltage regulation is directly proportional to input voltage regulation since there is no output feedback.

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