OBSOLETE

LM109JAN

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SNVS379B – NOVEMBER 2005 – REVISED MARCH 2013

*Zener is internal to LM109.

**Q1 must be able to withstand 7A continuous current if fusing is not used at regulator input. LM109 bond wires will

fuse at currents above 7A.

†Q2 is selected for surge capability. Consideration must be given to filter capacitor size, transformer impedance, and

fuse blowing time.

††Trip point is

≈ 7.5V.

Figure 4. Output Crowbar

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