It based on the reference circuit
XT1.1 - 12.5V or XT1.2 and pwm_control_dxo - 12.5V
VOUT - 22V
IC pin 15 - 12V
IC pin 16 - 8V
R5 And R6 - not installed
But between XT2.1 and XT2.3 or XT2.2 and XT2.3 -- 0V
Led strings stay off
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It based on the reference circuit
XT1.1 - 12.5V or XT1.2 and pwm_control_dxo - 12.5V
VOUT - 22V
IC pin 15 - 12V
IC pin 16 - 8V
R5 And R6 - not installed
But between XT2.1 and XT2.3 or XT2.2 and XT2.3 -- 0V
Led strings stay off
You are welcome, I am glad it worked out. For future reference the VCC pin on a switching regulator is the output of an internal linear regulator that supplies power to all of the control circuitry and the FET gate driver. If there is no capacitor it will collapse as soon as there is a sudden current surge, the like FET turning on. So it is always important to have a capacitor to provide the current and keep VCC up. Good luck and let me know if you have any further questions.