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NCL30080 Datasheet(PDF) 11 Page - ON Semiconductor |
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NCL30080 Datasheet(HTML) 11 Page - ON Semiconductor |
11 / 25 page NCL30080 www.onsemi.com 11 Application Information The NCL30080 implements a current−mode architecture operating in quasi−resonant mode. Thanks to proprietary circuitry, the controller is able to accurately regulate the secondary side current of the flyback converter without using any opto−coupler or measuring directly the secondary side current. • Quasi−Resonance Current−Mode Operation: implementing quasi−resonance operation in peak current−mode control, the NCL30080 optimizes the efficiency by switching in the valley of the MOSFET drain−source voltage. Thanks to a smart control algorithm, the controller locks−out in a selected valley and remains locked until the input voltage or the output current set point significantly changes. • Primary Side Constant Current Control: thanks to a proprietary circuit, the controller is able to compensate for the leakage inductance of the transformer and allow accurate control of the secondary side current. • Line Feed−forward: compensation for possible variation of the output current caused by system slew rate variation. • Open LED protection: if the voltage on the VCC pin exceeds an internal limit, the controller shuts down and waits 4 seconds before restarting switching. • Brown−Out: the controller includes a brown−out circuit with a validation timer which safely stops the controller in the event that the input voltage is too low. The device will automatically restart if the line recovers. • Cycle−by−cycle peak current limit: when the current sense voltage exceeds the internal threshold VILIM, the MOSFET is turned off for the rest of the switching cycle. • Winding Short−Circuit Protection: an additional comparator with a short LEB filter (tBCS) senses the CS signal and stops the controller if VCS reaches 1.5 x VILIM. For noise immunity reasons, this comparator is enabled only during the main LEB duration tLEB. • Output Short−circuit protection: If a very low voltage is applied on ZCD pin for 90 ms (nominal), the controllers assume that the output or the ZCD pin is shorted to ground and enters shutdown. The auto− restart version (B suffix) waits 4 seconds, then the controller restarts switching. In the latched version (A suffix), the controller is latched as long as VCC stays above the VCC(reset) threshold. |
Similar Part No. - NCL30080_15 |
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Similar Description - NCL30080_15 |
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