12V Input to 65W USB-PD Source
- Daniel Puratich
- Ian Van Den Steen
Introduction
Who
Daniel Puratich arch
Ian Van den Steen EE designer, documentation
What
Take a 12V input DC and output up to 100W over USB-C PD
Each board should be less than 20 dollars
Why
CSA approval means we need to buy expensive USB-C PD sources for use in the bay
We have CSA approved 12V power supplies already
This will save us money
Resources
USB Charger (USB Power Delivery)
USB Power Delivery explained: What you need to know about ubiquitous charging
100W USB Type-C Power Delivery Source: Getting Started
A Primer on USB Type-C® and USB Power Delivery Applications and Requirements
Engineering
PD controller Selection
Main Options
There were a couple options available:
Decision Matrix
USB PD Controller | Option 1 | Option 2 | Option 3 | Option 4 |
|---|---|---|---|---|
Name | MPQ5031GRE-0001-AEC1-Z | TPS65988DJRSHR | STUSB4761QTR | TPS25751 |
Description | 100W USB PD controller | Dual channel 100W USB PD Controller | 100W USB PD controller |
|
Price | $3.16 CAD | $6.27 CAD | $2.58 CAD | $2.51/2.56 CAD |
Configuration | I2C | I2C interface | NVM config thru I2C or cc pin |
|
Misc. Pros | PPS, simple | Dual channel | Cheap, simple, PPS | PPS<br>Preconfigured firmware |
Misc. Cons | More expensive | Only for TBT3 designs, expensive, more complex | Odd datasheet | more complex |
Option 1 was chosen for its extensive datasheet, simplicity
Buck boost controller selection
Main Options
I found a very limited selection of buck/boost, and boost converter ICs that were within the scope of the product. Another alternative is to just use a buck converter IC and cap the voltage at 12V, and thus 60W.
Decision Matrix
PMIC | Option 1 | Option 2 |
|---|---|---|
Name | MP4245GVE-0000-Z | TPS54531DDAR |
Description | 36V 6A Buck/Boost converter | 28V 5A Buck converter |
Price | $6.95 CAD | $2.70 CAD |
Configuration | I2C |
|
Misc. Pros | Full 100W range, good datasheet | Cheap, already used |
Misc. Cons | Expensive | Can only buck down, so limits Vbus to 12V, thus 60W output<br><br>Unclear whether you can adjust output voltage without changing resistor divider |
Option 1 was chosen for its easy integration with USB PD IC and ability to reach 100W.