- The Twin USB Port Charger can present a 2 A, 5 V output from numerous DC energy sources.
- The design has a large enter voltage vary and two USB charging ports.
Throughout emergency situations like pure disasters or protracted energy outages, finding an influence supply for charging cellphones or different Common Serial Bus (USB) communication units might be troublesome. Though Alternating Present (AC) mains chargers are often accessible, they’re ineffective when no energy grid exists. Moreover, when the final USB battery backup charger programs are depleted, it raises the query of different strategies to cost essential USB-powered units. Analog Gadgets (ADI) have launched a reference design for twin USB port charger CN0509 to simplify the design course of. The design can provide 2 A at 5 V from numerous Direct present (DC) energy sources and has a large enter voltage vary. The circuit options two USB charging ports, one with a devoted charging port (DCP) controller.
The reference design can rework a number of DC energy sources starting from 5 V to 100 V right into a regulated 5 V, 2 A provide. The design incorporates safety towards reverse voltage situations. The circuit can survive a reverse connection to the DC energy supply as a result of the polarity of an improvised energy provide could also be unsure. The design additionally consists of light-emitting diodes (LEDs) that perform as indicators and provides visible suggestions on whether or not the ability supply is related correctly or must be modified. The design gives two output ports, permitting for simultaneous use. The design is predicated on an remoted flyback converter with a step-down (buck) DC-to-DC converter. The reference design consists of two LEDs that point out the enter energy. An energetic fixed present driver circuit gives regular brightness with slight variance. This circuit maintains the LED present all through the working vary, providing constant brightness ranges.
The buck converter effectively converts a higher DC voltage to a decrease voltage with little energy loss and excessive energy density. A micropower, non-opto, remoted flyback converter follows the buck stage. The converter achieves regulation by not directly sensing the output voltage by way of sampling the first facet flyback waveform, eliminating the requirement for optocouplers or a 3rd sense winding on the coupled inductor. The design gives quick charging as much as 2A. The design operation stays practically fixed throughout enter voltages starting from 12 V to 100 V because of the remoted converter’s fixed 12 V enter. Nonetheless, you will need to word that decrease enter voltages scale back accessible charging present. The twin USB port charger can stand up to reverse enter connections of as much as 100 V. The design can stand up to a most working temperature of 150 °C.
ADI have examined this reference design. It comes with a Invoice of Materials (BOM), schematics, Gerber information, meeting information, Printed circuit board (PCB) structure, and so on. Yow will discover extra knowledge concerning the reference design on the corporate’s web site. To learn extra about this reference design, click on right here.
