Amps
[Top] [All Lists]

[AMPS] Blow TL922

To: <amps@contesting.com>
Subject: [AMPS] Blow TL922
From: 2@vc.net (measures)
Date: Fri, 25 Feb 2000 05:18:55 -0700
>
>
>The zener diode can be replaced with a series of c. 7, 1A forward-biased
>diodes. Such an arrangement is much more rugged than a zener.
>
>And also poor regulation - Does it really matter ? 

The cathode current varies from c. 160mA to c. 1000mA.  The resultant <1v 
variation in forward drop across the diode string is not very significant 
compared to the approx 115v of driving signal.  

> If you are doing that you
>might as well just use a resistor

With a resistor, to obtain the needed 5v of bias with 160mA,  approx 31 
ohms of R would be called for.  With c. 1000mA in a 31 ohm resistor, the 
drop would be c. 31v.  

> as the bias is only a few volts and it
>will probably still be cleaner than the driver. 

31 is hardly a few 

> I suggest you use a low
>power zener and a transistor, or a programmable zener like the TL431 and a
>pass transistor. G3SEK might comment.
>
Can this arrangement withstand 50a glitches?

--
FAQ on WWW:               http://www.contesting.com/ampsfaq.html
Submissions:              amps@contesting.com
Administrative requests:  amps-REQUEST@contesting.com
Problems:                 owner-amps@contesting.com
Search:                   http://www.contesting.com/km9p/search.htm


<Prev in Thread] Current Thread [Next in Thread>