LD Adjustable and fixed low drop positive voltage regulator. Datasheet – production data. Features. • Low dropout voltage (1 V typ.). The LD is a LOW DROP Voltage Regulator able to provide up to C. The ADJUSTABLE LD is pin to This datasheet has been download from. ld are available at Mouser Electronics. Mouser offers inventory, pricing, & datasheets for ld
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All fair and well so I went over datashet this online calculator and tried to see how these values work. This is where I suspect I am making a mistake or misunderstand something.
See below on how I calculated the values:. That did not make sense. So I realized that Vr is not related to Vin. I redid the calculation and I think I understand it now. This looked much better and more inline with what I daatsheet excepting.
My first challenge was to do a simple 5V to 3.
Then I had a look at the IC close up and well confusion struck me. Now this IC has a datasheet here. This datasheet is a lot more detailed and on page 24 there is an application note for the adjustable variant. Which one should I use? I did a calculation based on the sparkfun datasheet and I got a value datqsheet R2 of 0.
I am pretty sure Ld111 am correct at this point but I hate the blue smoke monster and I just needed a sanity check from a copilot. One other question with the adjustable voltage regulators the input voltage can range from 15V downwards?
I know at some point when the Vin drops too low there will be now conversion but using these values above would I be able to convert say 9V,12V or even 15V to 3.
Initially I got an output of 2V Then I realized I had the two resistor swapped around I can confirm this works. With the experiment I have just done I am pretty sure I understand this now. These regulators try to maintain their reference voltage your Vr usually about 1. However, in this world, nothing is perfect.
On Page 14 of the ST datasheet, the typical reference voltage is given as 1. You will datahseet to use standard resistor values, which will also adjust the output voltage a bit The Electrical Characteristics table lists a “Dropout voltage” sometimes called “headroom” – this is the minimum diference between input and output voltages that will allow the regulaltor to operate. In this case, if the regulator is supplying mA, the input voltage should be at least 1.
Home Questions Tags Users Unanswered. I had a look at the datasheet they provide in the product page but it points me to a Fairchild semi conductor datasheet which has a typical application note that looks like this: See below on how I calculated the values: You need to detail what you did with respect to the ST datasheet calculation.
The daycounter calc assumes it’s 0.
LD – Adjustable and fixed low drop positive voltage regulator – STMicroelectronics
That’s a reasonable approximation a lot of the time. RespawnedFluff tes you are correct.