Boosting the Current Limit of Current Limiting Diodes As seen in ECN
The current limiting diode (CLD) or current regulating diode (CRD), despite its simplicity and distinct advantage over a conventional transistorized current source, has limited use. One reason is that presently available CLD’s can provide current regulation only up to 15mA maximum, and in terms of power, only1 watt maximum. Hence, the usefulness of the CLDs is limited to low power applications such as telephone line circuit modules, hand held devices and single IC chips or small areas of a PC board. However, the bulk of electronic applications involve current levels much higher than 15 mA and the same may be said of the power levels. Conventionally, by adding the CLDs in parallel, the limiting current may be doubled, tripled, and multiplied. However, it would be cumbersome and impractical by just adding the CLDs to attain high current levels. For example, it is not uncommon to require a current limit protection at 1 amp or higher at the conventional PC card or system module level. It would not make any practical sense to use 66 CLDs in parallel to attain 1 amp or 100 CLDs to attain 1.5 Amp. Therefore, the need for a practical solution to achieve high current limit is evident.Presented henceforth is a simplified description of the practical circuit design technique to boost the current limit by utilizing the current gain of a transistor and applying basic circuit theory.
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Application note & Design Guide |
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Please see the document for details |
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English Chinese Chinese and English Japanese |
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2018/04/19 |
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198 KB |
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