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LD2117A 数据表(PDF) 8 Page - Unisonic Technologies

部件名 LD2117A
功能描述  LOW DROP FIXED AND ADJUSTABLE POSITIVE VOLTAGE REGULATORS
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制造商  UTC [Unisonic Technologies]
网页  http://www.utc-ic.com
标志 UTC - Unisonic Technologies

LD2117A 数据表(HTML) 8 Page - Unisonic Technologies

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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.


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