Anybody know of a source for the VB408 HV regulator? I realize that they went extinct a few years back, but I need about 20 of them. I've looked at some of the discontinued IC warehouses, but they only want to talk about $200 - $300 per line item. Are there any such suppliers that don't have such an exorbitant minimum order?
The LR8 and LR12 can't handle the requirements... input=150-180 VDC Output=80-120 VDC Imin=8ma Imax=30ma
oh, need leaded parts... no SMT Thanks for suggestions
-- Dave M MasonDG44 at comcast dot net (Just substitute the appropriate characters in the address) Life is like a roll of toilet paper; the closer it gets to the end, the faster it goes.
Wow, 30 volts dropout!
I realize that they went
Resistor+zener+follower?
Maybe a depletion-mode fet, just for fun?
John
NTE catalog, TV voltage reg modules. cant remember the number, but when I worked for a MRO parts supplier, we stocked them as part of the mandatory stock. (and never sold a one!)
the
Have you looked at the Sanken STR30000 series?
I gues it is the same as from ST (SGS-Thomson). Isn't it?
I used to make a PCB "plug-in" replacement with same lead spacing, made to mount on a heatsink to plug into main PCB vertically. Made about 2100 of them and broke even at $10 each. I quit while i was ahead. Designed and made both positive and negative supply versions.
The dropout on the ones i made, if i remember correctly was about 9V.
Many thanks for the suggestions. The VB408s are needed for repair jobs. The LR8 with an add-on current booster is a possibility, although the overcurrent protection is a problem, mainly due to lack of space for many additional components. I've considered Win Hill's suggestions for increasing the current capability of the LR8. Could try stuffing an add-on board with the current boosting circuitry.
I also found the TL783 from TI that is a possibility. It has the current capability, but the max Vin isn't spec'ed in the datasheet; only the Vin/Vout differential (125V). Also will have to provide some additional minimum load current; its Imin is 15 ma!!! The normal operating parameters seem to be within the TL783's capabilities, but any guesses as to whether it could survive a short to ground on the output with
180V on the input pin? As a last resort, I might have to live with the risk.-- Dave M MasonDG44 at comcast dot net (Just substitute the appropriate characters in the address) Life is like a roll of toilet paper; the closer it gets to the end, the faster it goes.
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