Published:2009/7/24 0:11:00 Author:Jessie | From:SeekIC
This circuit performs the same function of that shown in Fig. 7-63, except that a trim pot is not required (some engineers believe that good trim pots are expensive, inexpensive trim pots can be unreliable, and any trim pot that can be adjusted can also be misadjusted). When first tested, this circuit might have a VOUT 4% to 6% higher than the 22.0 V. While monitoring VOUT with a precision meter, snip out R3, R4, and/or R5, as necessary to bring VOUT within 1% of 22.0V. If VOUT is 23.08 V or higher, cut out R3 (if lower, do not cut R3). Then, if VOUT is 22.47 V or higher, cut out R4 (if lower, do not cut R4). Finally, if VOUT is 22.16 V or higher, cut out R5 (if lower, do not cut out R5).
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