Constant Current Driving Circuit with Variable OFF Time Control

The patent applies dynamics by making the OFF time of the power switch variable rather than fixed. The OFF time is dynamically adjusted based on the output voltage level - when output voltage increases, the OFF time is extended proportionally. This dynamic adaptation allows the control circuit to maintain stable output current across varying load conditions without requiring overly complex control logic, thus resolving the contradiction between device complexity and output current stability.

The patent implements feedback by continuously monitoring the output voltage and using it to adjust the OFF time of the power switch. The control circuit detects changes in output voltage caused by load variations and compensates by extending the OFF time when voltage rises, thereby maintaining stable output current. This feedback mechanism enables the system to handle increased power delivery requirements while suppressing ripple current and maintaining output stability.

The patent applies parameter changes by adjusting the OFF time duration based on the output voltage level. Rather than using a fixed or excessively long OFF time, the system dynamically modifies this parameter - extending OFF time only when output voltage increases, and maintaining shorter OFF times when voltage is stable. This selective parameter adjustment improves output current stability by reducing ripple current only when necessary, while preserving power delivery efficiency during normal operating conditions.