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LD2117L-XX-AA3D-R датащи(PDF) 8 Page - Unisonic Technologies

номер детали LD2117L-XX-AA3D-R
подробное описание детали  LOW DROP FIXED AND ADJUSTABLE POSITIVE VOLTAGE REGULATORS
PDF  12 Pages
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производитель  UTC [Unisonic Technologies]
домашняя страница  http://www.utc-ic.com
Logo UTC - Unisonic Technologies

LD2117L-XX-AA3D-R датащи(HTML) 8 Page - Unisonic Technologies

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LD2117/A
LINEAR INTEGRATED CIRCUIT
UNISONICTECHNOLOGIESCO.,LTD
8 of 12
www.unisonic.com.tw
QW-R102-042.D
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)
The UTC LD2117/A also supports MLCC. See Fig.6 for adjustable output and Fig.7 for fixed Output
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.



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