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203 Threads found on edaboard.com: Ldo Not
Hi All, I've just taped-out an ldo, and I'm going to package and test the ldo soon. I have several doubts about my subsequent work. I greatly appreciate your kind suggestions and advises. Before I raise my questions, please first have a glance of some specifications of the ldo, Input voltage:1.2V Output voltage:1V Max loading (...)
Hi all, I have a problem when doing ac simulation. If my ldo is 1V output voltage with 1mA current, which kind of output load should I use in ac simulation (HSPICE)? 1. Using a 1mA current source directly ? 2. Using a resistor with the value of 1kohm ? Thanks. CD Hi, If you are using current source then it wil
i ordered the ic . I have trouble with components because most of them are not kept on stock . I get to components based on orders , and delivery times are long here... It's not worth to order by myself since i order only a few components (let's say 3 pieces of LT3080) so the shipping is more then the value of those components. That's why i order t
"High" isn't helpful. Quantify your expectations / requirements. ldo power dissipation is (VIN-VOUT)*IOUT neglecting ground current. ldo delivered power is VOUT*IOUT ldo efficiency is POUT/(POUT+PDISS). For a 5-3.3V your nominal eff% is 3.3/5 or 66%. not heinous, not fabulous. Probably on a par with a (...)
Consider "noise" a vague term. You should better analyze interference level versus frequency and specify your clean power supply requirements. Different ldo have different degree of ripple rejection. Ripple rejection at the typical SMPS pwm frequencies is not generally good and mainly achieved by output capacitors. Respectively a good LC filter
OK, I think a ldo will do the job. For instance ADP333, but there are many other. This one has the benefit that it's stability is almost not affected by the ESR of the output capacitor.
Hello people! I am wondering about the drop out voltage of the next particular ldo. I am planing to use a LT1634-5 to make stable a power supply of 5V. It is going to be admissible to have a drop out voltage of 100mV. However having a look to the datasheet of this component i am not able to find this specification. And furthermore I simulate wit
i used the transformer from WURTH ELEKTRONIK ( Transformateur d'isolation with 3 W,vin 85V ? 265V,vout 5V) , standard power diodes 1N4007, capacitor2200uF, regulator from TEXAS INSTRUMENTS LM2940IMP-5.0/NOPB Régulateur ldo , 0V ? 26V, 500mV Dropout, 5Vout, 1Aout, SOT-223-3
I can happily work the amp from 12 volts to a safe value of 16 volts There is just about enough overhead to use a 12V regulator in that case. Something like a 78S12 will give a constant 12V out with input ranging from 14.5V up to about 30V and can handle 2A. It will need a heat sink but not a huge one. An ldo regulator would
Hello guys, I appreciate very much If you could help me. I can't understand the following: I know that the dropout voltage of an ldo is related to the minimum input voltage necessary to maintain regulation. So, If a datasheet says the dropout for a specific regulator is 100mV, and the output voltage is 3.3V, I should get 3.3V with a minimum 3.4V
There's mismatch and there's mismatch. not all of it stems from simple VT scatter. You may find that devices operated in saturation (considered by most to be a Good Thing) are more sensitive to things like variations in Leff than VT. You can attack this by looking at mismatch and process variation separately / orthogonally. In a piece-part ldo
Your specification is incomplete and unclear. What is the required output voltage? Is a variable output range as well? Even an ldo linear regulator has a minimum dropout voltage, an input voltage of only 0.3 volts would like not be sufficient for voltage regulation except for a few millivolts output. BigDog
Hi, ...from Layout perspective not from layout perspective...but maybe from the ldo. Usually in each ldo´s datasheet there is a chapter about the output capacitor. Read the datasheet. There is no general rule.. it really depends on the type of ldo you use. Klaus
ldos cannot respond to infinitely fast step loads. The capacitor bank qualities need to take up the slack, and this means not just C but ESL/ESR. The loop feedback, if accessible, is also worth tweaking. It's a team sport, basically.
Hi, Did you read the datasheet? --> LM317 is specified for only 1.5A. **** 5V input and 4.2V output with 2A max current. This means the dropout voltage of the regulator must be less than 0.8V. Expect a dropout voltage at the LM317 of at least 1.5V (see chart "dropout voltage" in datasheet). So the LM317 Can neither deliver the current , nor deli
I think an ldo pass-Tx should always operate in saturation region to allow for good regulation. If - at high output current - its operation point moves below its saturation voltage into the triode region, the ldo gain gets worse, so the output error increases.
Why not use a 5V adapter and regulate down with an ldo regulator like a LF33 or similar?
Read the datasheet! Vdd must not be supplied with a voltage larger than 3.3V, the on-chip regulator must be enabled for 3.3V Vdd. Means the ldo is needed in bus-powered operation, too.
7806 is not the best ldo to use here. edit** Reason? ldo will drop 2.5V at 1.5A at 85'C , which means you need 8.5 min anyway but chances are your load demands more than 1.5 and that's causing shutdown on starting. Power dissipation (9-6V)*1.5A= 4.5W is a big problem A heatsink will improve overtemp condition, but not (...)
Design a ldo regulator with the following parameters Input voltage 8-10 V, Output voltage 4.5 V, Output current 300 mA


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