This design employs superior applied sciences like gallium nitride (GaN) FETs for top switching frequencies, decreasing the dimensions of elements similar to transformers and capacitors whereas enhancing effectivity.
Pocket book PCs and smartphones depend on adapters to cost their batteries effectively. USB Energy Supply (PD) negotiation allows these gadgets to ascertain an influence contract, guaranteeing the optimum energy degree is delivered based mostly on the battery’s circumstances. This protocol helps as much as 100 W (20 V, 5 A) energy supply, facilitating fast and environment friendly charging. Excessive effectivity and compact design are essential to conserving vitality and enhancing the portability of those adapters.
A pocket book adapter features as an AC/DC converter, typically requiring an influence issue correction (PFC) stage for output energy exceeding 75 W. This reference design offers a high-efficiency, high-power-density AC/DC adapter resolution with a broad enter voltage vary of 100-240 V AC, making it appropriate for each laptop computer 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 remoted DC/DC converter using the UCC28780 controller.
The adapter delivers key options similar to a large enter vary (100-240 V AC) and configurable outputs, together 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 measurement of 70 mm × 42 mm × 16.5 mm with an influence density of 30 W/in³. Moreover, it consumes lower than 130 mW in standby mode, making it extremely energy-efficient.
Synchronous rectification utilizing the UCC24612 controller additional improves efficiency. Constructed-in safety mechanisms safeguard in opposition to over-current, over-power, and over-voltage circumstances, guaranteeing the security of related gadgets. The adapter robotically recovers from faults like brief circuits and over-power occasions, whereas over-voltage circumstances set off a latch to forestall injury.
Validated for efficiency metrics similar to regulation, ripple, and switching stresses, this 100-W AC/DC adapter delivers dependable and environment friendly energy in a compact kind issue, assembly world effectivity requirements and addressing the challenges of recent adapter designs.
Texas Devices (TI) has examined this reference design. It comes with a invoice of supplies (BOM), schematics, meeting drawing, printed circuit board (PCB) format, and extra. The corporate’s web site has further information in regards to the reference design. To learn extra about this reference design, click on right here.
