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LD2127AL-AD-AA3-B-R датащи(PDF) 4 Page - Unisonic Technologies |
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LD2127AL-AD-AA3-B-R датащи(HTML) 4 Page - Unisonic Technologies |
4 / 6 page LD2127/A Preliminary LINEAR INTEGRATED CIRCUIT UNISONICTECHNOLOGIESCO.,LTD 4 of 6 www.unisonic.com.tw QW-R102-054.a APPLICATION NOTE of LD2127/A ADJUSTABLE The LD2127/A adjustable has a reference voltage of between the OUT and ADJ pins. IADJ is 7μA typ. (10μA max.) and IADJ is 0.3μA typ. (2µA max.). R1 is normally fixed to 1.2kΩ. From figure 1 we obtain: VOUT=VREF+R2(IADJ+IR1)=VREF + R2(IADJ+VREF/R1)=VREF(1+R2/R1) + R2 × IADJ. Usually R2 value is in the range of few KΩ, so the R2 X IADJ product could be neglected; then the above expression becomes: VOUT=VREF(1+R2/R1) For better load regulation, realize a good Kelvin connection of R1 and R2 is important. Particularly R1 connection must be realized very close to OUT and ADJ pin, while R2 ground connection must be placed as near as possible to the negative Load pin. Ripple rejection can be improved by introducing a 10μF electrolytic capacitor placed in parallel to the R2 resistor (See Fig. 2) The UTC LD2127/A also supports MLCC. See Fig.3 for adjustable output. IN OUT ADJ UTC LD2127/A + + 10µF 10µF R1 1.2kΩ VIN VOUT VREF R2 Fig.1 Adjustable Output Voltage Application Circuit Fig.2 Adjustable Output Voltage Application with improved Ripple Rejection. |
Аналогичный номер детали - LD2127AL-AD-AA3-B-R |
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Аналогичное описание - LD2127AL-AD-AA3-B-R |
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