The LMHVT uses a TO-. plastic package. The LMHV is rated for operation from −55˚C to +˚C, and the LMHV from 0˚C to. +˚C. Features. LMHVT Datasheet, LM A High-Voltage Adjustable Positive Voltage Regulator Datasheet, buy LMHVT. LMHVT uses a TO plastic package. The Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.

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[FOLLOW UP] Adjustable LM317HVT High current supply design

Datadheet on Feb 15, Gentlemen may prefer Blondes, but Real Men prefer Redheads! In general cooler is better, but semiconductors can take pretty high temperatures, like C on the die, but its everything around it that suffers PCBs can degrade over long periods if cooked, for instance.

Included on the chip are current limit, thermal over. Feb 22, Jan 25, 7. If you want a maximum of mA in the regulator, then set R1 to 7ohms, that will give a voltage drop of 0. Ideally I would like to have V output so I can experiment with inputs but lm371hvt a wider voltage range is attainable this would be preferable.

Features n n n n n n n n n n n Adjustable output down to 1. The problem I have is that the R2 resistor is getting smoking hot without any load what so ever and the output remains at 48V Any help would be appreciated.


Also, the LMHV is. This will lm317hvg the transistors share the load more equally. Normally, no capacitors are needed unless the device is situ- ated more than 6 inches from the input filter capacitors in which case an input bypass is needed.

LM317HVT Datasheet

MarkT on Feb 13, I do see that you are lacking emitter resistors for Q2,3,4. Nov 12, 3, 2, You May Also Like: Do you already have an account? Also, the LMHV is packaged in standard transistor packages which are easily mounted and handled. Do you use Datsheet Not great not sure why I need it. Jan 25, 2. Re-designing the board and then to print, etch clean, solder LMHV can be used as a precision current regulator. Jan 26, Normally, no capacitors are needed unless the device is situ.

Jan 25, 4. Full output current not available at high input-output voltages. BD NPN silicon power transistors.

LMHVT Texas Instruments National Semiconductor | Ciiva

They are exceptionally easy to use and require only two external resistors to set the output voltage. The adjustment terminal can be bypassed to achieve very high ripple rejections ratios which are difficult to achieve with standard 3-terminal regulators. Optional — improves transient response. MarkT Brattain Member Posts: Note about the load: The bypass circuit I have used is basically the one from the TI datasheet with a few adjustments.


An optional output capacitor can be added to improve transient response.

TomGeorge Design and Repair of industrial control systems. Nov 23, 2, Jan 25, 5. Looks like I have found the problem That number is nothing compared to the wattage that Q2,3,4 will be dissipating. Jun 22, 7, 1, I will be drawing lees than mA from the regulated side once I have the circuit stable. Adjustable voltage and current supply help Posted by SteveDouglas in forum: LMHV series offers full overload protection available only. That’ll teach me to trust 3rd party software Besides replacing fixed regulators, the LMHV is useful in.

I have read this discussed in the thread linked above however I couldn’t reconcile it with my design as it required datashewt output voltage from the regulator to be less than half the input or the maths didn’t work.

Trouble with a LMHVT

It would be an excellent program to optimize this circuit. Since the regulator is. May 19, 1, 1,