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LD2127AL-AD-AA3-B-R датащи(PDF) 4 Page - Unisonic Technologies

номер детали LD2127AL-AD-AA3-B-R
подробное описание детали  LOW DROP FIXED AND ADJUSTABLE POSITIVE VOLTAGE REGULATORS
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производитель  UTC [Unisonic Technologies]
домашняя страница  http://www.utc-ic.com
Logo UTC - Unisonic Technologies

LD2127AL-AD-AA3-B-R датащи(HTML) 4 Page - Unisonic Technologies

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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.


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