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Why Two USB-C Cables Can Charge Differently

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Two USB-C cables can fit the same ports while allowing different power limits. Follow the messages between a charger, a cable and a laptop to see where that limit comes from. Our original animation uses an illustrative, compatible 20 V USB-C-to-C Power Delivery setup. At 20 V, 3 A permits up to 60 W; an appropriately identified 5 A cable permits up to 100 W when the charger and device also support that profile. These are supported limits, not measurements of battery charging speed. Actual draw can be lower. Power capability and data capability are separate. CHAPTERS 00:00 Same plug, different limits 00:19 How power is agreed 00:45 The cable's identity check 01:08 Power limits and data ratings SOURCES Texas Instruments: An Engineer's Guide to USB Type-C https://www.ti.com/lit/eb/slyy228/slyy228.pdf STMicroelectronics: USB Power Delivery negotiation https://wiki.st.com/stm32mcu/wiki/STM32StepByStep:Getting_started_with_USB-Power_Delivery_Dual_Role USB-IF: USB Power Delivery https://www.usb.org/usb-charger-pd USB-IF: cable compliance and power markings https://compliance.usb.org/index.asp?Format=Standard&UpdateFile=Cables+and+Connectors Infineon: electronic cable identification (current-capability section; historical maximum-power statement is superseded) https://community.infineon.com/t5/Knowledge-Base-Articles/FAQs-on-CCGX-EZ-PD-CCGx-Product-USB-Type-C-Cables-EMCA/ta-p/247747 Original script and schematic animation: Mechanism Atlas. Illustrative diagrams are not physical measurements or representations of a tested commercial product. No certification logos are reproduced. Related: How Transformers Change Voltage https://www.youtube.com/watch?v=5-XKKQmfG0Y

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