Linear Technology has introduced the LT1683, a push-pull DC-DC controller designed to minimise conducted and radiated electromagnetic interference in step-up or step-down power supplies.
The LT1683 achieves this by independently controlling the output switch voltage and current slew rates.
Low switching harmonics eliminate filters, EMI shields and the tedious task of iterating the PCB layout.
The device drives external n-channel MOSFETs to deliver 10 W or more of output power. The IC targets applications such as xDSL, power supplies for DWDM servers, wideband transmission systems as well as industrial instrumentation, and medical monitoring systems.
The LT1683 can reduce high frequency harmonic power by up to 40 dB. It uses a dual output (push-pull) current mode architecture optimised for low noise topologies. Unique error amp circuitry can regulate both positive and negative voltages for easier layout than conventional DC-DC converter switching regulators.
The internal oscillator frequency is adjustable from 20 to 250 kHz with a capacitor and a resistor. The LT1683 allows easy synchronisation to an external clock running at up to 290 kHz.
Phone: 02 8832 3000
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