The reference design helps engineers create energy options utilizing GaN expertise, bettering efficiency and lowering losses for charging functions…
The 65-W USB Energy Supply (PD) 3.0 adapter reference design from Texas Devices permits design engineers to develop compact energy options for varied charging functions, together with cell phones, laptops, and tablets. The reference design utilises built-in gallium nitride (GaN) expertise, enabling increased switching frequencies with diminished losses and enhancing effectivity and energy density. The quasi-resonant flyback topology additional improves effectivity by balancing simplicity and low switching losses, dynamically adjusting the switching frequency to minimise drain voltage on the first field-effect transistor (FET). The design additionally incorporates a GaN gadget built-in with sense emulation, which permits nearly lossless present sensing, additional boosting the system’s general effectivity.
This reference design permits engineers to optimise their energy supply options for space-constrained functions, because the high-frequency GaN expertise permits smaller inductors, diminished core sizes, and fewer major windings. The compact design fits cell wall chargers, USB wall energy retailers, and auxiliary energy provides. Engineers can minimise transformer dimension by integrating the LMG3624, a 170-mΩ GaN FET with present sensing and switching capabilities whereas bettering system effectivity. The elimination of conventional shunt resistors by built-in present sensing helps cut back energy losses and decrease prices, making the design more cost effective.
Engineers also can optimise transformer design for high-frequency operation, which is important for sustaining effectivity in high-density designs. Within the quasi-resonant converter, excessive switching frequencies minimise the dimensions of the transformer, however engineers should choose the fitting switching gadget to keep away from vital energy loss penalties. When deciding on switching gadgets, the reference design offers a transparent framework for contemplating frequency-dependent and current-dependent conduction losses. Moreover, the board comes with a USB Kind-C PD controller, and engineers can join it to a USB Kind-C PD load by the onboard connector to regulate the output voltage to 5V, 9V, 15V, or 20V, relying on the applying. Engineers will want a USB Kind-C PD load that communicates to totally utilise the variable output voltage, such because the PM125 USB Energy Supply Tester and PassMark Software program.
For testing totally different outputs, a normal USB Kind-C cable can be utilized to attract as much as 3.00A at 5V, 9V, or 15V, however an E-marker USB Kind-C cable is required to realize 3.25A on the 20V output. The board’s flexibility permits engineers to check varied configurations and discover the boundaries of their energy supply designs, making it a flexible instrument for creating environment friendly, high-performance energy options.
A few of the key options of the reference design embrace:
- 25.29 W/in³ energy density for compact designs
- 92.83% effectivity at full load, 90 Vac
- 94.09% effectivity at full load, 115 Vac
- 94.32% effectivity at full load, 230 Vac
- 70 mW loss discount with built-in present sensing
- 30 mW standby energy at 115 Vac
- Low temperatures for simple thermal administration
- Common AC enter voltage assist
TI has examined this reference design. It comes with a invoice of supplies (BOM), schematics, meeting drawing, printed circuit board (PCB) structure, and extra. The corporate’s web site has further knowledge in regards to the reference design. To learn extra about this reference design, click on right here.
