Burn-in & Test Socket Workshop - BiTS Workshop
Burn-in & Test Socket Workshop - BiTS Workshop
Burn-in & Test Socket Workshop - BiTS Workshop
Create successful ePaper yourself
Turn your PDF publications into a flip-book with our unique Google optimized e-Paper software.
BIB Over-current Protective Device (1)<br />
• Fuses are commonly used to isolate and protect the UUT on BIB.<br />
• Us<strong>in</strong>g correct fuse current rat<strong>in</strong>g, type (fast or slow-act<strong>in</strong>g) and derat<strong>in</strong>g<br />
factor is important to avoid circuit electrical over-stress.<br />
Fuse rat<strong>in</strong>g = Normal Operat<strong>in</strong>g Current/0.75 x % rat<strong>in</strong>g<br />
<strong>Burn</strong>t Trace<br />
Operat<strong>in</strong>g Temp vs Fuse Rat<strong>in</strong>g<br />
% Rat<strong>in</strong>g<br />
180<br />
160<br />
140<br />
120<br />
100<br />
80<br />
60<br />
40<br />
20<br />
0<br />
Slow-Act<strong>in</strong>g<br />
Fast-Act<strong>in</strong>g<br />
PPTC<br />
Lack of protection causes die EOS<br />
-60C<br />
-40C<br />
-20C<br />
0C<br />
20C<br />
25C<br />
40C<br />
60C<br />
Operat<strong>in</strong>g Temp<br />
80C<br />
100C<br />
120C<br />
Fuse value is derated with elevated operat<strong>in</strong>g temperature<br />
• They are current sensitive devices serv<strong>in</strong>g as a weak l<strong>in</strong>k <strong>in</strong> BIB circuit.<br />
• Fuse characteristic is determ<strong>in</strong>ed by respond to various current overload.<br />
• Slow-act<strong>in</strong>g fuse has more thermal <strong>in</strong>ertia that tolerates <strong>in</strong>itial overload<br />
current.<br />
• Fast-act<strong>in</strong>g or very fast-act<strong>in</strong>g fuse is good for sensitive, critical circuits.<br />
KWLow/Zamel <strong>BiTS</strong> 2002 7
Change language