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LM340 DATASHEET PDF

LM–XX. Input. Cin*. µF. CO**. Output. 1. MOTOROLA ANALOG IC DEVICE DATA. Three-Terminal Positive. Fixed Voltage Regulators. This family of fixed. the LM is available in the SOT package, as well .. †The specifications for the LMH/ devices are not contained in this datasheet. Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet. 2All trademarks are the property of their respective.

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MikeJ-UK 5, 11 Matt, having read a little more about it, ESR certainly seems likely to be the reason.

The output capacitor is NOT a filter capacitor in any traditional sense. By using our site, you acknowledge that you have read and understand our Cookie Policy datasehet, Privacy Policyand our Terms of Service. The only reason for choosing tantalum might be lifetime, and this can be designed for with aluminium wet electrolytic caps. Post Your Answer Discard By clicking “Post Your Answer”, you acknowledge that you have read our updated terms of serviceprivacy policy dataheet cookie policyand that your continued use of the website is subject to these policies.

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National Semiconductor

Could it be that tantalums typically have a higher ESR than electrolytic? Russell McMahon – Huh? Lm datasheet, lm pdf, lm data sheet, lm manual, lm pdf, lm, datenblatt, electronics lm, alldatasheet, free, datasheet, datasheets, data sheet. A wet aluminum capacitor will meet this spec with ease. The input capacitor is a typical reservoir capacitor, its value is relatively non critical. Tantalum serves no technical purpose here. Why does the LM data sheet specifically specify tantalum capacitors?

If the feedback is negative overall the system is stable and the output is DC. To provide loop stability they require an output capacitor which has both capacitance and ESR in selected ranges.

This type of capacitor is not well-suited for low temperature operation. Although designed primarily as a fixed voltage regulator, these devices.

And one final note, did you refer to the ripple voltage on the cap being large even for small currents as an inherent issue due to the small size? The intuitive and the logical do not always match.

Using a tantalum capacitor as the input capacitor invites capacitor death at any time if the input power rail can have voltage spikes on it from any source.

I’d be pleased to hear anyone critique my reply on technical grounds.

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MattYoung Actually yes, it is. Electolytics have poor high dxtasheet performance compared to tantalums. Although designed primarily as a fixed voltage regulator, these devices can be used with external components to obtain adjustable voltages and currents.

LMT-5 Datasheet

Sign up or log in Sign up using Google. Solid tantalum capacitors have a more stable ESR over temperature, but are more daatsheet than aluminum electrolytics. The lmalmlm78xxc monolithic series is available in the to plastic power package, and the lm Post as a guest Name. Lm datasheet, lm datasheets, lm pdf, lm circuit. The ESR of the output capacitor will cause loop instability if it is too high or too low.

This requirement could be met by an aluminum wet electrolytic cap or a ceramic cap. A common ground is required between the input and. ESR is a “Goldilocks requirement”: I’m still a little puzzled about why they specifically call out tantalum so much, but your answer makes clear that I can overlook this.

Tantalum is an OK choice but is not the best choice. The overall feedback is described by a transfer function involving the components involved.