This design employs superior utilized sciences like gallium nitride (GaN) FETs for prime switching frequencies, reducing the scale of components just like transformers and capacitors whereas enhancing effectivity.
Pocket e-book PCs and smartphones rely on adapters to value their batteries successfully. USB Power Provide (PD) negotiation permits these items to establish an affect contract, guaranteeing the optimum power diploma is delivered based mostly totally on the battery’s circumstances. This protocol helps as a lot as 100 W (20 V, 5 A) power provide, facilitating speedy and setting pleasant charging. Extreme effectivity and compact design are important to conserving energy and enhancing the portability of these adapters.
A pocket e-book adapter capabilities as an AC/DC converter, usually requiring an affect challenge correction (PFC) stage for output power exceeding 75 W. This reference design presents a high-efficiency, high-power-density AC/DC adapter decision with a broad enter voltage fluctuate of 100-240 V AC, making it applicable for every laptop computer pc adapters and smartphone chargers. The design incorporates a front-end transition-mode (TM) PFC circuit powered by the UCC28056 controller, adopted by an active-clamp flyback isolated DC/DC converter utilizing the UCC28780 controller.
The adapter delivers key choices just like a big enter fluctuate (100-240 V AC) and configurable outputs, along with 5 V/5 A, 9 V/5 A, 15 V/5 A, and 20 V/5 A. It achieves a peak effectivity of 93.4% with pure cooling and boasts a compact dimension of 70 mm × 42 mm × 16.5 mm with an affect density of 30 W/in³. Furthermore, it consumes decrease than 130 mW in standby mode, making it extraordinarily energy-efficient.
Synchronous rectification using the UCC24612 controller further improves effectivity. Constructed-in security mechanisms safeguard in opposition to over-current, over-power, and over-voltage circumstances, guaranteeing the safety of linked items. The adapter routinely recovers from faults like temporary circuits and over-power events, whereas over-voltage circumstances set off a latch to forestall hurt.
Validated for effectivity metrics just like regulation, ripple, and switching stresses, this 100-W AC/DC adapter delivers reliable and setting pleasant power in a compact sort challenge, meeting worldwide effectivity necessities and addressing the challenges of latest adapter designs.
Texas Units (TI) has examined this reference design. It comes with a bill of provides (BOM), schematics, assembly drawing, printed circuit board (PCB) construction, and additional. The company’s website online has further info regarding the reference design. To study further about this reference design, click here.
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