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MIC47150WD Datasheet(PDF) 9 Page - Micrel Semiconductor |
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MIC47150WD Datasheet(HTML) 9 Page - Micrel Semiconductor |
9 / 11 page Micrel, Inc. MIC47150 October 2009 9 M9999-102309-A Application Information Adjustable Regulator Design The MIC47150 allows programming the output down to 0.9V. From the typical application in Figure 1, the output voltage is set by placing a resistor divider network from OUT to GND and is determined by the following equation: ⎟ ⎠ ⎞ ⎜ ⎝ ⎛ + × = 1 R2 R1 0.9 VOUT where VOUT is the desired output voltage. The resistor value between VOUT and the adjust pin should not exceed 10kΩ. Larger values can cause instability. The resistor values are calculated from the above equation, resulting in the following: ⎟⎟ ⎠ ⎞ ⎜⎜ ⎝ ⎛ − × = 1 0.9 V R2 R1 OUT EVB Layout The MIC47150 evaluation board layout is shown in Figures 2 and 3. For customer application boards, recommended variations include using a static resistor for R2 in place of the potentiometer as well as the elimination of all test points and jumper options that are included on the MIC47150 evaluation board. Figure 2. MIC47150 EVB Top Layer Figure 3. MIC47150 EVB Bottom Layer |
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