Texas Instruments Inc. (TI, Dallas, TX) announced its new 20 A, wide-input (18 V to 60 V), isolated dc-dc plug-in power module with Auto-Track™ sequencing technology, the PTB78520W, which simultaneously powers up with any downstream, non-isolated, Auto-Track compliant, point-of-load (POL) module. The PTB78520W is suitable for applications requiring simultaneous power-up of non-isolated POL modules. The switched design also eliminates the need for extra FETs and control circuits for sequencing a 3.3 V intermediate bus.
The PTB78520W provides design flexibility to 24 V and -48 V telecom and computing distributed power systems, including complex digital systems requiring 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 module comes in a horizontal through-hole or surface-mount package that measures 36.8 mm x 56.3 mm x 12.5 mm. The power modules are available in volume production. Pricing per module in quantities of 1,000 is $62. Lead-free and RoHS-compatible versions will be available in the fourth quarter of 2005.