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Because of its extremely high power datasheey capability the. How reliable is it? Using single 12V supply to deliver 12V and 5V Hope it may help a bit, any further query is welcomed.

But in this case you have to datasbeet a minimum load always present until the power to the regulator is on. Adjustment pin current change is specified for the worst-case combination of input voltage output current and power dissipation Changes due to. R2 should be same type as R1 with TC track- ing of 30 ppm C or better. Digital multimeter appears to have measured voltages lower than expected.

Minimum load current of 10 mA is normally satisfied by the resistor divider which sets up output voltage. I have a feeling its the fault of the variable resistor perhaps the resistance decreases as temp increases.

The LM is in a TO-3 package with oversized 0 leads to provide best possible load regulation Operating junction temperature range is.

LM396 PDF Datasheet浏览和下载

Measuring air gap of a magnetic core for home-wound inductors and flyback transformer 7. The factor llm396k 1 1 is only an approximate factor accounting for load regula. Because the LM datashewt a three-terminal device it is not pos- sible to provide true remote load sensing Load regulation will be limited by the resistance of the output pin and the wire connecting the regulator to the pm396k For the data sheet specification regulation is measured 1 4.

Fax a49 85 How can the power consumption for computing be reduced for energy harvesting? Please don’t make requests for help in private using ,m396k. Low line voltage AC rms. Direct paralleling of datasheef is not normally recommend- ed because they do not share currents equally The regula- tor with the highest reference voltage will supply all the cur- rent to the load until it current limits With an 18A load for instance one regulator might be operating in current limit at 16A while the second device is only carrying 2A Power dis- sipation in the high current regulator is extremely high with attendant high junction temperatures Long term reliability cannot be guaranteed under these conditions.


Three-terminal regulators can only provide partial Kelvin load sensing om396k Load Regulation Full remote sensing can be added by using an external op amp to cancel the effect of voltage drops in the unsensed positive output lead In. Further improvements in efficiency can be obtained by using Schottky diodes or high efficiency diodes with lower forward voltage combined with larger filter capacitors to reduce rip- ple However this reduces the voltage difference between input and drive pins and may not allow sufficient voltage to fully saturate the pass transistor Special transformers are available from Signal Transformer that have a 1V tap on the output winding to provide the extra voltage for the drive pin The transformers are available as standard items for datasneet ap- plications at 5A 10A and 20A Other voltages are available on special request.

Minimum input-output voltage of regulator. A quick look at the curves show that heat sink resistance i.

Consider reading this before posting: How do you get an MCU design to market quickly? Email cnjwge tevm2 nsc com.

Tel 1 Internal current and power limiting. See Curves for Limits. DC regulated output voltage. To keep in mind that the bypass capacitor on the adjust- ment pin will limit the turn-on time of the regulator A 25 mF capacitor combined with the output divider resistance will give an extended output voltage settling time following the application of input power. Satasheet line resistance created by wiring connectors or parallel ballasting.


Create a thread in the forum so that other members can benefit from the posted answers. National does not assume any responsibility for use of any circuitry described no circuit patent licenses are implied and National reserves the right at any time without notice to change said circuitry and specifications.

PNP transistor not working 2. Although it datasheet not be immediately obvious best load regu- lation is obtained when the top of the divider is connected. Output voltage guaranteed under worst-case conditions. Temperature coefficient of output voltage. Proper transformer ratings are very important in a high cur- rent supply because of the conflicting requirements of effi- ciency datasheett tolerance to low-line conditions A transformer datasjeet a high secondary voltage will waste power and cause unnecessary heating in the regulator Too low a secondary voltage will cause loss of regulation under low-line condi- tions The following formulas may datsheet used to calculate the required secondary voltage and current ratings using a full- wave center tap.

Choosing IC with EN signal 1.

LM Datasheet National Semiconductor pdf data sheet FREE from

R3 if continuous output shorts are possible 2 Under normal load condi- tions system power dissipation is not changed but under short circuit condi- tions.

If you look page 9 of the lm936k it gives you the complete information and calculating R3. If Military Aerospace specified devices are required please contact the National Semiconductor Sales Office Distributors for availability and specifications.

Better still anyone who can give me a schematic so i can jst construct it i would be very grateful i’m jst a l engr student. Here are few graphs for your dahasheet for selecting heat sink without complex calculations: