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I'm struggling to increase duty cycle in the controller. I'm using SG3525 on control PCB. As can be seen below, R12,R22 and C12 components are selected for 58kHz frequency. circuit However, I can't get duty cycle more than 45%. Typical duty cycle is given 47% in datasheet. Does the max. duty cycle limited by frequency?

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  • \$\begingroup\$ You can get a higher duty cycle at the vc pin, but it only sinks current. \$\endgroup\$ Commented Mar 9 at 20:41

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Datasheet only guarantee 45 % duty cycle. You should not expect more.

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