Budget convertors supply new "standard" voltages

Datel's new LSN D12 series SIPs are nonisolated DC/DC convertors that accept 12V inputs and deliver outputs from 1 to 5V rated at 10A.

The insatiable demand for higher performing ICs has spawned the demand for a plethora of "standard" supply voltages and associated currents.

Today's system boards often require six or seven voltages (0.8, 1, 1.2, 1.5, 1.8, 2.5, 3.3, 5V and so on) at individual currents ranging from 2 to 60A.

Consequently, the days of a "power supply per voltage" are numbered as such straightforward power delivery simply costs too much.

Parallel, isolated power paths from backplanes onto system boards are redundant and no longer affordable.

The latest advancement in distributed power, the most cost-effective power-delivery solution to date, consists of onboard 12V buses supplying power to numerous nonisolated, step-down, buck regulators.

The basic elements are: a single isolated DC/DC convertor coming onto the board; an onboard 12V bus/plane; and multiple, nonisolated DC/DCs (often located at their point of load) tapping into the 12V plane.

Datel's new LSN D12 series SIPs are nonisolated DC/DC convertors that accept 12V inputs (10.8 to 13.2V input range) and deliver 1, 1.2, 1.5, 1.8, 2, 2.5, 3.3 or 5V outputs rated at 10A.

The LSNs single-inline (SIP) packages (51 x 14 x 8.6mm) can be configured in either vertical or horizontal orientations.

The former occupies a mere 450mm2.

The latter is a mere 8.64mm high.

LSN D12s are true "plug and play" power convertors enabling power system architects to configure solutions literally in minutes.

In most applications, LSNs require no external I/O filtering to achieve either specified noise levels or FCC-compliant radiated/conducted emissions.

They are designed with onboard input/output caps fully rated to handle the necessary input ripple current and fully capable of reducing output noise to specified levels.

Not needing transformers, octocouplers or complicated FET drive circuits in their secondaries, nonisolated DC/DCs are considerably cheaper than their isolated brethren.

The D12 LSN's best-in-class power density is achieved with a fully synchronous, fixed-frequency, buck topology that delivers: high efficiency (96% for 5V models), low noise (30-50mV peak-peak), tight line/load regulation (maximum +/-0.1%/+/-0.25%), quick step response (100ms), stable no-load operation(for circuits going into "sleep" mode), and no output reverse conduction.

High efficiency enables LSN SIPs to deliver more output current at temperature than virtually all competing devices.

All models deliver full power to at least +50C with no supplemental airflow.

With minimal airflow (100 litre/min), all models operate at full power to at least +67C.

The LSN feature set includes output overcurrent detection, continuous short-circuit protection, a +/-10% output-voltage trim function, a remote on/off control pin, and an output sense pin.

Free LSN D12 sample/evaluation units for qualified OEMs and/or preproduction quantities up to 25 pieces, are immediately available from stock.

Production quantities require 6-8 weeks.

Small quantities of UNR, 30-66W series DC/DC convertors (or free sample/evaluation units) can be ordered directly from the Datel website using a credit card.

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