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SJ1117-API Datasheet(PDF) 8 Page - KODENSHI_AUK CORP.

Part # SJ1117-API
Description  Adjustable and Fixed Voltage Regulator
PDF  18 Pages
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Manufacturer  KODENSHI [KODENSHI_AUK CORP.]
Direct Link  http://www.kodenshi.co.kr
Logo KODENSHI - KODENSHI_AUK CORP.

SJ1117-API Datasheet(HTML) 8 Page - KODENSHI_AUK CORP.

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KSD-I0T005-008
8
SJ1117xxx
◈ Application Note
Input Bypass Capacitor (CIN)
An Input capacitor is recommended. A 10μF tantalum capacitor on the input is a suitable bypassing for all
applications.
Adjust Terminal Bypass Capacitor(CADJ)
The adjust terminal can be bypassed to ground with a bypass capacitor to improve ripple rejection
This bypass capacitor prevents ripple from being amplified as the output voltage is increased. At
any ripple frequency, the impedance of the CADJ should less than R1 to prevent the ripple from being
amplified
The R1 is the resistor between the output and the adjust pin.
Output Capacitor(COUT)
The output capacitor(COUT) is critical in maintaining regulator stability, and must meet required
conditions for both minimum amount of capacitance and ESR. The minimum COUT required is
10μF(tantalum capacitor). Any increase of the COUT will merely improve the stability and transient
response. The ESR of the COUT should range between 0.3Ω - 22Ω. In the case of the adjustable regulator,
when the CADJ is used, a larger COUT (22μF) is required.
Output Voltage
The SJ1117 develops a 1.25V reference voltage between the output and the adjust terminal (See Fig.9).
By placing a resistor between these two terminals, a constant current is caused to flow through R1 and
down through R2 to set the overall output voltage. Normally this current is chosen to be the specified
minimum load current. Because IADJ is very small and constant when compared to the current through R1,
it represents a small error and can usually be ignored. For fixed voltage devices R1 and R2 are included in
the device.
SJ1117
IN
OUT
ADJ
VIN
VOUT
+
+
CIN
CO
R1
R2
VREF
IADJ
1
)
2
(
1
R
C
f
ADJ
RIPPLE
〈
×
×
π
Fig.13 Basic Adjustable Regulator
(
)
2
1
2
1
R
I
R
R
V
V
ADJ
REF
OUT
×
+
+
=



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