May 18, 2020 #2 KlausST Super Moderator. Vttt�-uK��.�����f0il,6�h�8��͛@`��ɷ HK �,XD�A�!�a!cC2�w���A���!���I�1�� �n��\I]g.3�N+g8�87��!������HB�-'�SP�������@��x �Nk� Foldback current limiting is most likely to be found in a switchmode power supply when it is a component in a product that is independently certified to meet regional safety standards. The load current I L flows through resistor R 5, causing a voltage drop of I l R 5 (approximately) across it. [3], "The New Stuff!!! 0000001436 00000 n sink_fold_back.png. 0000005419 00000 n 0000002946 00000 n Foldback helps to keep the output transistor within its safe operating area under fault and overload conditions. However it adds complexity to the power supply and can trigger "lockout" conditions with non-ohmic devices that draw a constant current independent of supply voltage (such as op-amps). 0000000836 00000 n 0000002869 00000 n Moreover, the below table highlights which type of current limiting/current foldback circuitry is used by the main Torex LDO’s. Is it possible to add foldback current limiting to this circuit for situations like the load is shorted in order to protect the transistor? Attachments. 0000001300 00000 n [2]. This is illustrated in Figure 4. startxref Some electronic circuits employ active current limiting, since a fuse may not protect solid-state devices. Under normal conditions, transistor Q 2 doesn't conduct, and resistors R 1 and R 2 bias MOSFET Q 1 into conduction. The optional component R2 protects Q2 in the event of a short-circuited load. endstream endobj 75 0 obj <> endobj 76 0 obj <>stream 0000061410 00000 n 0000025596 00000 n A foldback current limiter may also employ a transient delay to both avoid lockout and limit localized heating at the short circuit. which is very nearly the load current. %%EOF We can easily convert the above fixed current limiter into a versatile variable current limiter circuit. trailer h�T�Mo�0��� Foldback is a current limiting feature (a type of overload protection) of power supplies and power amplifiers.When the load attempts to draw overcurrent from the supply, foldback reduces both the output voltage and current to well below the normal operating limits. 0000005290 00000 n <<497373F12B63FD48A80199481641D275>]>> 0000002175 00000 n 0000006823 00000 n 66 27 From this you can make up your own definitions. The circuit in Figure 1 incorporates foldback-current limiting to protect the pass transistor by adding feedback resistor R 4. When the current through R_sense exceeds the design limit, Q2 begins to turn on, which in turn begins to turn off Q1, thus limiting the load current.
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