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LD1117AL-15-TN3-A-R датащи(PDF) 11 Page - Unisonic Technologies

номер детали LD1117AL-15-TN3-A-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

LD1117AL-15-TN3-A-R датащи(HTML) 11 Page - Unisonic Technologies

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LD1117/A
LINEAR INTEGRATED CIRCUIT
UNISONICTECHNOLOGIESCO.,LTD
11 of 12
www.unisonic.com.tw
QW-R102-006,Q
APPLICATION NOTE of LD1117/A ADJUSTABLE
The LD1117/A ADJUSTABLE has a reference voltage of between the OUT and ADJ pins. IADJ is 60μA typ.
(120
μA max.) and ΔIADJ is 1μA typ. (5μA max.).
R1 is normally fixed to 120
Ω.
From figure 4 we obtain:
VOUT=VREF+R2(IADJ + IR1)=VREF + R2(IADJ + VREF / R1)=VREF(1+R2/R1) + R2 x 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 LD1117/A
+
+
10μF
10μF
R1
120Ω
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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