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ZXRE060A Datasheet(PDF) 8 Page - Diodes Incorporated |
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ZXRE060A Datasheet(HTML) 8 Page - Diodes Incorporated |
8 / 12 page ZXRE060 0.6V ADJUSTABLE PRECISION SHUNT REGULATOR ZXRE060 Document number: DS33611 Rev. 6 - 2 8 of 12 www.diodes.com March 2011 © Diodes Incorporated A Product Line of Diodes Incorporated Application Information (Continued) Figure 7. 1V Current-boosted shunt regulator ⎟ ⎠ ⎞ ⎜ ⎝ ⎛ + = 2 R 1 R 1 REF V OUT V ( BE V V 2 . 0 OUT V + ≥ ) 3 R I OUT V IN V 3 R − = Design guides 1. Determine IOUT and choose a suitable transistor taking power dissipation into consideration. 2. Determine IB from ) 1 (min) FE h ( (max) OUT I B I + = 3. Determine IR3 from (max) OUT I 3 R I = 4. Determine R3 from 3 R I OUT V IN V 3 R − = 5. It is best to let the ZXRE060 supply as much current as it can before bringing Q1 into conduction. Not only does this minimise the strain on Q1, it also guarantees the most stable operation. Choose a nominal value between 10mA and <15mA for this current, IR4. 6. Calculate R4 from 4 R I BE V 4 R = Figure 8. 1.15V over-voltage indicator VOUT goes low and LED is lit when monitored supply ⎟ ⎠ ⎞ ⎜ ⎝ ⎛ + > 2 R 1 R 1 REF V M V 3 R I ) 2 . 0 F V ( IN V 3 R + − = ) MAX ( F I 3 R I mA 15 ≤ ≥ VF and IF are forward voltage drop and current of LED1. |
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