Plug-in power

Texas Instruments has developed a 20A, wide-input (18 V to 60 V), isolated DC/DC plug-in power module that uses the company’s Auto-Track sequencing technology.

Texas Instruments has developed a 20A, wide-input (18 V to 60 V), isolated DC/DC plug-in power module that uses the company’s own Auto-Track sequencing technology.

The PTB78520W is suited to both 24-V and -48-V telecom and computing distributed power systems, including digital systems that require power sequencing of multiple power supply rails.

Achieving power conversion efficiency up to 90%, the module provides two high-current outputs that are both regulated to the same output voltage. The first output incorporates softstart and a remote on/off control. The second output is switched, which allows the user to control the output voltage with the Auto-Track function. The switched output tracks the voltage present at the Track I/O pin.

The PTB78520W’s switched output design is suitable for applications requiring simultaneous power up of non-isolated point-of-load (POL) modules, such as TI’s PTH series of POLA plug-in modules. The switched design also eliminates the need for extra FETs and control circuits for sequencing a 3.3V intermediate bus.

TI’s Auto-Track technology provides sequencing control to simplify the power-up sequencing of multiple modules. A single control pin connects to the Auto-Track pin of non-isolated POL modules to accommodate various sequencing requirements.

The PTB78520W module comes in a horizontal through-hole or surface-mount package that measures 36.8 mm x 56.3 mm x 12.5 mm.

Pricing per module in quantities of 1,000 is $62. Lead (Pb)-free & RoHS-compatible versions will be available in the fourth quarter of 2005.

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