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TL494: Output PWM duty cycle adjustment

Part Number: TL494
Other Parts Discussed in Thread: TL594

Tool/software:

Dear Experts,

We want to use TL494 or TL594 as a constant current source and would like to know if the output PWM duty cycle of these two chips can be adjusted to over 95%, and how to design it to achieve this? We have tested TL494 and currently it can only reach 88%. Thank you~