65-W USB Type-C ZVS-Flyback Reference Design

1 Description

This reference design is a low-cost, high-density USB adapter that uses the UCC28782 active-clamp flyback controller and UCC5304 isolated driver in a ZVS-flyback topology. The maximum power rating is 65 W at 20-V output but is adjustable for 20-, 15-, 9-, and 5-V output voltage and 3 A. This design reaches a peak efficiency of 93.4%. The average efficiency and standby power levels are designed to meet DoE level VI and CoC Tier 2 limits. The compact design has dimensions of 44 mm × 54 mm × 20 mm (48cc open frame).

Figure 1-1 Top View of Assembly

Figure 1-3 Angle View of Assembly

Figure 1-2 Bottom View of Assembly

Figure 1-4 Angle View of Assembly

2 Test Prerequisites

2.1 Voltage and Current Requirements

Table 2-1 Voltage and Current Requirements

Parameter	Specifications
Input voltage range	90 VAC–265 VAC, 50 Hz, 60 Hz
Output voltage range	5 V–20 V
Maximum output current	3.25 A
Maximum output power	65 W

2.2 Dimensions

44 mm × 54 mm × 20 mm