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Email Required, but never shown. It’s not uncommon to assume the air inside an average box at least 20 degrees above maximum room temperature, so that would be 60 degrees in your case. I was drawing it quickly.

I’m asking about if this 1. Am I overloading it because I’m using its max. Post as a guest Name. One trick around that is to mount the regulator with its nearly 12W peak dissipation pessimistic worst case assumption, sure, but still outside the box onto a heatsink. Sign up using 780012ap and Password.

AP Datasheet – TAAP, Positive Voltage Regulator – Toshiba

First of all your diodes can handle 1A average rectified current, but you must consider that when you have a 1A output rating they will get quite warm themselves 1W based on the parameter table: It’s smarter to just use diodes with a higher forward current and if possible lower forward voltage drop. You need at least 7V input for the LM to create a 5V output, so the dip in the voltage across the capacitor can’t fall below that.


Is it due to diodes that have the lowest max. If I buy a transformer of 1A. You can buy diodes with a higher max.

If it’s a plastic box with no ventilation at all no holes or slots for passive air flow you may be looking at 40 to 60 degrees temperature rise between outside an in, putting a huge damper on all your internal dissipation capabilities.

Nobut your diodes wear out faster if you use it on max current. Datasheet says that the output current is 1A at a temperature of 75 deg. This means you should choose a transformer with a low as possible output voltage that still gives you a stable output voltage, here we come to voltage ripple calculation.

Yesits due the max. Why do choose 1A? I would like to know the max current of the transformer and the fuse. For transformer and fuse: Before anyone can answer your questions you will have to daatsheet and correct a few things: You need to consider many things for this, for which you need to consult the datasheets carefully.

In Egypt, the temperature is between 20 and 40 deg.

NicolaSysnet Oh I’m sorry. By clicking “Post Your Answer”, you acknowledge that datazheet have read our updated terms of serviceprivacy policy and cookie policyand that your continued use of the website is subject to these policies.


AP(VR) NTE Equivalent NTE 12V positive voltage – Wholesale Electronics

Datasheet says that the output current is up to 1. I will choose them according to the answer of this question. By using our site, you acknowledge that you datasheft read and understand our Cookie PolicyPrivacy Policyand our Terms of Service.

Take a transformer that will handle a bit more, so for example 2A, to save on heat and wear in it, since your large capacitor will draw a higher daatasheet current to charge up. The air will heat up because of all the hot parts, and in a box it can’t easily move out. It is just an error in the schematic.

You can use an small heatsink to lower the temperature. If you increase the capacitance datasheef 10mF total that ripple at 1. So we get 8ms.

78012AP Datasheet PDF – Toshiba

SteveG 1 I’m sorry about the schematic. For me, it is recommended that the output current is 1.

Then, your LM can handle 1. To calculate heatsinks and all that the ambient temperature, by the way, is not the temperature outside or in your house, but inside the box you put it in.

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