1. Home
  2. Electronics Design
  3. 90V DC-DC converter IC?
  4. Page 2

90V DC-DC converter IC?

any given situation.

at startup.

try "where the load may be shorted, ever"

nor is it appropriate when you care about load regulation, line regulation or efficiency

his current-limited version is even worse. when current limiting into a short, it turns into a linear regulator......full current, full voltage.

yes there is indeed such a thing as BAD, and this circuit is one example. Its OK if you are a hobbyist, and really dont care much about how well your circuit works (Mr Blacks push-in prototype board construction is a great example) or what the reliability is like; conversely for a real application, its a disaster.

Cheers Terry

Reply to
Terry Given
Loading thread data ...

any given situation.

at startup.

Fine - there are lots of apps where this will never happen, or if it does you don't care.

Again, there are many apps where cost is more important than performance. It was never claimed to be ideal in all circumstances.

I just measured an example I breadboarded last week : intended to supply around 12V at 100mA

output voltage for an input range of 18 to 33V :

94R load : 12.53 to 12.57 188R load : 12.53 to 12.65V No load : 12.70 to 12.83

Not as good as most SMPS chips, but more than adequate regulation for many applications.

Reply to
Mike Harrison

for any given situation.

shorted at startup.

don't care.

It seems good enough for my 12V to 7V 20mA battery charger. Furthermore, with the emitter LC tank, it should limit the current surge and improve oscillations.

By the way, I plan to have three circuits 12V -> 7V, 5V -> 7V and

4V-6V -> 30V sharing a common ferric core. They are only active one at a time. To save space, there will be six sets of wirings on the core. A linear rod is the preferred mounting size, but a donut if necessary. I know circular core is better, but how bad would be a linear rod. The coils are 20uH to 300uH.
Reply to
linnix

formatting link

Reply to
djstokes

ElectronDepot website is not affiliated with any of the manufacturers or service providers discussed here. All logos and trade names are the property of their respective owners.