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UCC28950:Output short circuit protection and over current protection |
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Part Number: UCC28950 Can this IC provide DCDC output short-circuit protection and over-current protection? What is achieved by? Is it achieved by cycle-by-cycle current limit or peak-current mode control? |
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Hello The UCC28950 and UCC28951 both provide over current and short circuit protection. Please have a look at the section of the Data Sheet dealing with this topic - I |
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Alright, thank you very much. It |
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Hello Output SHORT CIRCUIT protection using the primary current works and is effective and uses the primary current sensing network which is needed in any case for peak current mode control (PCM) or for current limiting (Voltage Mode) so that there are no added circuit components. Hiccup modes reduce the average power dissipation while in short circuit but if you are using the primary current to control the output then the currents during the active part of the hiccup will be larger as Vin increases and smaller as Vin decreases. Normally Vin is from a PFC stage so Vin is relatively fixed so this behaviour is not a problem. If Vin varies over a wide range then it might be necessary to add a separate output current limiting circuit, but you will still need to sense the primary current for control purposes. Regards Colin |
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