[TenTec] Need advice about OVP for 262G

[Dr. Gerald N. Johnson]

On Wed, 2009-04-01 at 08:56 -0500, Hulett, Russell wrote:
> Hello Mike,
> 
> As I read the datasheet for the 1.5KE15A, the breakdown voltage is nominally 15 VDC.  So when the pass transistor shorts, won't the transient diode limit the voltage to the load to nominal 15 VDC, bypassing enough current to ground to trip the overload on the power supply?

Nominal at a particular current. Higher current from the supply the
voltage is higher, maybe a lot higher.

> I intend to incorporate a fast-blow fuse, not sure why the question prompted the sarcasm.

Until you get to the super fast silver element fuses, a fast blow fuse
is just a good indicator that the associated transistor has melted. E.g.
the lifetime of the overloaded semiconductor is shorter than the fuse.
> 
> 73, Curt KB5JO

Then the added voltage drop of the fuse and fuse holder take away from
the desired power supply regulation.

73, Jerry, K0CQ