The LMHV/LMHV are adjustable 3-terminal positive voltage regulators capable of supplying in excess of A over a V to 57V output range. They are . The LMHV/LMHV are adjustable 3-terminal semiconductor products and disclaimers thereto appears at the end of this data sheet. The LMHV/LMHV are adjustable 3-terminal positive voltage regulators capable of supplying in Details, datasheet, quote on part number: LMHV.
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LMHV from Texas Instruments
If so, is there anything l3m17hv I have to be careful such as power ratings, Vmax, Vce, etc. Here is the datasheet: Datasheet says, ” Since the regulator is floating and sees only the input-to-output differential voltage, supplies of several hundred volts can be regulated as long as the maximum input to output differential is not exceeded, or in other words, do not short the output to ground.
Also, what should be the power ratings of the resistors R5 and R4. Could you help me to calculate the required power rating?
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For V, I calculate it as around 5W. It is possible but not this way. In a word – NO. It is rated for 60 volts input, but output has resistors and capacitors to ground. The difference between input and output can be 60 volts minus 1. That is why in the application images it shows a output of 50 volts with an input of 60 volts or less. Since the output has resistors and loads connected to ground, the device is essentially referenced to ground for voltage adjust and loads.
You can use a beefy zener diode to raise ground up volts or more, but this becomes your new ‘ground’ reference and if it shorts the LM will short out as well. It can be done if you accept the risk Below is an ‘Active’ zener diode using a bjt to boost the load current. For high voltage and high current Q1 becomes a bit expensive. First, zener in series with capacitor C1 and C3, as shown in EDIT2 will not work – where is no path for discharge current until voltage of “-” pin drops to zero.
Use caps rated for Vin and Vout, and connect them directly. Second, in case of output overload, voltage drop across LM may become as high as Vin, which will breake it.
Home Questions Tags Users Unanswered. Yes but NOT like this. What are you trying to achieve with this power supply? What’s the load look like? Is this for a bench supply of some kind? Or are you trying to power a Nixie? I am going datashwet drive a piezo actuator with this. The actuator has around 4uF capacitance. There is a switching circuit at the tail of the regulator that charges and discharges the piezo actuator. C2 could be a problem too. Tony EE rocketscientist 62k 2 datashedt How can I add some extra protection to limit the current datashedt of the load?
What if I run 30 Amps for micro seconds? You can follow the App Notesdatasheet but remember if the input short circuits for any reason the chip must be protected with a reverse diode.
Design requries thought about ESR C with several caps say from 0. Ferrite chokes, etc ertc. Why not buy a PSU from Meanwell?
But the power of 3kW for 0. But a phase controlled triac or variac supply will drop from no load to full load depends on Pd wasted power and Vmin for LDO so power is a premium for rep rate of pulse.
Because variac bridge can decay, unless you sync, load pulse during charge peak. This is a limit set forth in section 6.
Sparky 11k 2 15 So, I understand that as long as the input-to-output differential is within the given limits LM’s and 2N should be fine in terms of Vce. LM is a differential regulator so you can regulate 1kV in theory as long as input does not vary more than 40V.
LMHV Datasheet(PDF) – National Semiconductor (TI)