CH224K USB PD Adjustable Decoy

Using a USB PD decoy, a USB Type-C PD power adapter can be used as a power source, with selectable output voltages (fixed 5V, 9V, 12V, 15V, 20V) via a DIP switch. This is based on the inexpensive and easy-to-use CH224K multi-fast charging protocol power receiving chip.
 
 
The CH224K is a USB PD power receiving protocol chip that integrates PD3.0/2.0, BC1.2, and other fast charging protocols, automatically detects VCONN and analog E-Mark chips, supports up to 100W power, and has a built-in PD communication module. It also integrates output voltage detection to support overheat and overvoltage protection. Its features include:

4V to 22V input voltage
; PD3.0/2.0, BC1.2 and other fast charging protocols
; USB Type-C PD; positive and negative plug detection and automatic switching
; E-Mark simulation; automatic VCONN detection; support for 100W power PD requests;
the requested voltage can be dynamically adjusted through various methods;
high single-chip integration; simplified peripherals; low cost; built
-in overvoltage and overtemperature protection modules;

 
 
output voltage can be selected via DIP switches, as shown below:



Output Voltage 
SW1
SW2
SW3


5V
0
-
-


9V
1
1
1 1


12V
1
1
0


15V
1
0
0


20V
1
0
1



When the selected voltage has been successfully negotiated with the USB-C power adapter and appears at the output, the power supply normal LED will light up. The voltage can also be changed during operation.
 
Optimization Update: 10.31 Resistor R2 has been replaced with a higher power 1206 package to improve long-term working stability.