Compact design for high efficiency (>93%) USB-C Power Supply for Commodore 1541-II or 1581 External Floppy Disk Drive Unit.

• Improved efficiency, static line/load regulation, and reduced output ripple at 5V.
• Enhanced soft-start time to minimize inrush current during startup.
• Excellent line and load transient response.
• Improved ground planes and routing strategy to reduce noise and heat generation.
• Designed for Sustainability: significant reduction of kgCO2eq emissions during the use phase due to the compact design, selection of fully compliant RoHS/REACH components, and optimized power conversion efficiency.
• Reliable and long-standing: Hot-plug, Under-Voltage, Over-Load, Over-Voltage, Short-Circuit, Thermal protections and filters to reduce EMI.

With adequate USB-C power source, it is able to delivery continuously:

+5V: 4.5A (peak 6A)

+12V: 1.1A

Combined power cannot exceed power available from the USB-C power source (36W = 12V x 3A on delivery):

https://www.amazon.co.jp/dp/B0982VFYYJ?ref=ppx_yo2ov_dt_b_fed_asin_title

The USB-C cable should withstand 100W and be 200cm long (max):

https://www.amazon.co.jp/dp/B07V529BXP?ref=ppx_yo2ov_dt_b_fed_asin_title&th=1

BOM list: https://www.digikey.com/en/mylists/list/FPK059FEFB

The author is not an Amazon affiliate and may not receive a commission from products sold through links on this project page.

References:

https://lemmini.de/1541-II-Supply/1541-II-Supply.html

https://bitbucket.org/fade0ff/1541-ii-supply/src/master/