I did not know what the regulator will be used for.
+12V regulator supplies hi/low side mosfet driver. Positive side is
ground, negative side is -50VDC.
LM317 can replace both TL431 and series transistor.
> LM317HV.
seems expensive and only comes in large packages. Nice idea though.
___
> Wojciech Kazubski wrote:
> > -> Anyone use these shunt regulators? I'm wondering about the max voltage.
> >> Or set up your mailer to use a fixed-width font..
> Yes, that was it - thanks.
>
> I suspect this TL431 isn't a good device for my app. I have an LM317 to
> give me around +12V for b
> I agree and have given up :) Instead, I'm using LM317, and some extra stuff
> to drop the voltage down to its input. Not so bad on part count.
The TI TL783 is the same as the LM317 but will take an input voltage
of up to 150V,
no need for extra parts. Usually there is a BIG heat-sink.
http:/
As has already been mentioned, the problem will be what happens as the
supply turns on. In theory, as VCC ramps up, the 431 will start to
regulate and so limit its own cathode voltage. If VCC exceeds 36V before the
431 has started drawing current then all bets are off.
Crude but you could try put
Hi Gene,
As has already been mentioned, the problem will be what happens as the
supply turns on. In theory, as VCC ramps up, the 431 will start to
regulate and so limit its own cathode voltage. However, there may be a
delay before this starts to happen (due to the devices internal
startup and any
Wojciech Kazubski wrote:
-> Anyone use these shunt regulators? I'm wondering about the max voltage.
>> Or set up your mailer to use a fixed-width font..
Yes, that was it - thanks.
I suspect this TL431 isn't a good device for my app. I have an LM317 to
give me around +12V for bootstap voltage
On Sat, 20 Feb 2010 00:16:20 -0500, gene glick wrote:
> wow, that drawing didn't look very good in my mail client, but if you
> cut and paste into kedit it looks reasonable. :)
Looks good in my newsreader client :^)
There is a little schematic editor for ascii called "aacircuit"
http:/
-> Anyone use these shunt regulators? I'm wondering about the max voltage.
> Data sheet says max cathode-to-anode voltage is 36V. What if VCC = 50
> V, as in this cheezy drawing is trying to show. R1 and R2 set the
> output voltage at the emitter. R3 limits the current to the cathode
> *an
On Feb 20, 2010, at 12:16 AM, gene glick wrote:
>> Anyone use these shunt regulators? I'm wondering about the max voltage.
> wow, that drawing didn't look very good in my mail client, but if you cut and
> paste into kedit it looks reasonable. :)
Or set up your mailer to use a fixed-width fon
gene glick wrote:
Anyone use these shunt regulators? I'm wondering about the max voltage.
36V for LM431 ...
Data sheet says max cathode-to-anode voltage is 36V. What if VCC = 50
I use these and they're good parts. 50V will blow it up--be careful of
turn on, turn off and fault condition
If you can guarantee that R3 will always drop enough voltage, then you
should be fine. But consider what your circuit is going to do on
power-up and power-down, and if there will be any voltage spikes. If
you don't think your solution will cut it, you could add a zener diode
between ground and R2
gene glick wrote:
Anyone use these shunt regulators? I'm wondering about the max voltage.
wow, that drawing didn't look very good in my mail client, but if you
cut and paste into kedit it looks reasonable. :)
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Anyone use these shunt regulators? I'm wondering about the max voltage.
Data sheet says max cathode-to-anode voltage is 36V. What if VCC = 50
V, as in this cheezy drawing is trying to show. R1 and R2 set the
output voltage at the emitter. R3 limits the current to the cathode
*and* drops eno
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