![]() Unfortunately I would need a higher voltage chip, as the amp I would use it for would need +/-67v. ![]() Looking around for high voltage suitable opamps, the only one I could find was this one: OPA552PA Texas Instruments | Integrated Circuits (ICs) | DigiKey ![]() Some time ago I had also asked here about such a regulator, and Jan Didden had suggested a high voltage opamp that I can't remember which it was. Perhaps someone might remember them.īut I was thinking of a different, more sophisticated and more expensive approach: a high current Jung/Didden superregulator. The ones I was referring to, based on the 3X7 regulators, were used for an Erno Borbely 60W amp mod, and also for a Hafler DH220. OK, I don't have here the high voltage regulators suggested in The Audio Amateur, as I am not at home. What do you think? What would you suggest? Most amplifiers use such a solution, but sometimes the regulator they used there is not that good, and I think a 317/337 pair would work well. In that TAA article the regulator was used on a Hafler power amp, feeding a higher regulated voltage to the low current stages, leaving just the power output unregulated. If I remember well that zener was between 37v and 39v.ĭo you agree with such a regulator as safe to use? If I remember well, and that is what I am asking a suggestion for, what you had to use was to add a zener diode voltage between the regulator's output and input. What you does lose is protection, particularly from output short-circuit. So you can feed higher voltage at the regulator's input as long as the difference with the output voltage does not exceed 37v. But in fact what it can't accept is a 37v difference between input and output. In theory, the LM317/337 regulators, as well as the LT1083, accept up to 37v inputs. The talked about circuit is allocated to handle not a lot more than 1.5amps, if higher current is needed, both the ICs could be replaced with LM338 for getting a max 5amp current or LM396 for a max of 10amp current.Some time ago I had seen a variation of an LM317/337 power supply in The Audio Amateur but applied for higher voltages that it was designed for. This really is accomplished by adjusting R4. The current managed voltage provided from the upper stage is next placed on the lower LM317 voltage regulator circuit, which allows the most wanted voltage to be set between 1.25V to 30V, here the max range getting 9V since the source is a 9V battery. The above is determined by utilizing the following formula: R2 is chosen to obtain a range of around 1.25A max current limit, the minimum permitted being 5mA when the full 250 ohms is placed in the path, which means the current to the laser might be set as preferred, somewhere between 5mA to 1 amp. Fundamentally both the phases are attached in series for applying a total quick and easy voltage and current regulation for the linked load which can be a laser diode in the present case. The input supply source is linked across the Vin and ground of the upper current regulator circuit, the output out of this stage goes to the input of the lower LM317 variable voltage regulator stage. To be accurate the upper LM317 forms the variable current regulator stage while the lower behaves like a variable voltage controller stage. Talking about the presented circuit diagram, the set up appears quite simple, two LM317 IC s can be viewed, one set up in its standard voltage regulator mode and the other in a current control mode. The mentioned LM317 design is so precise that it might be preferably appropriate for all such specialist current and voltage controlled applications. The submit demonstrates precisely how the convenient IC LM317/338/396 can be utilized as a changeable voltage regulator as well as as a variable current regulator by means of simple configurations, employed for driving particular laser diodes which can be proven to possess strict working specs, and might be driven only by way of specific driver circuits.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |