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LD2117A 数据表(PDF) 8 Page - Unisonic Technologies |
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LD2117A 数据表(HTML) 8 Page - Unisonic Technologies |
8 / 11 page LD2117/A LINEAR INTEGRATED CIRCUIT UNISONICTECHNOLOGIESCO.,LTD 8 of 11 www.unisonic.com.tw QW-R102-042.B APPLICATION NOTE of LD2117/A ADJUSTABLE The LD2117/A adjustable has a reference voltage of between the OUT and ADJ pins. IADJ is 7μA typ. (10μA max.) and ΔIADJ is 0.3μA typ. (2µA max.). R1 is normally fixed to 1.2kΩ. From figure 4 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 10 μF electrolytic capacitor placed in parallel to the R2 resistor (See Fig. 5) IN OUT ADJ UTC LD2117/A + + 10µF 10µF R1 1.2kΩ VIN VOUT VREF R2 Fig.4 Adjustable Output Voltage Application Circuit Fig.5 Adjustable Output Voltage Application with improved Ripple Rejection. |
类似零件编号 - LD2117A |
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类似说明 - LD2117A |
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