sg117aig/desc Microsemi Corporation, sg117aig/desc Datasheet - Page 8

• Manufacturer Part Number: sg117aig/desc
• Description: 1.5 Amp Three Terminal Adjustable Voltage Regulator
• Manufacturer: Microsemi Corporation

Copyright © 1994
Rev. 1.3, 2006-02-08
B
recommended when the input filter capacitors are more than 5
inches from the device. A 0.1µF bypass capacitor on the
ADJUST pin is required if the load current varies by more than
1A/µsec.
accomplished by adding a 10μF capacitor from the adjust pin
to ground. For improved AC transient response and to prevent
the possibility of oscillation due to unknown reactive load, a
1μF capacitor is also recommended at the output. Because of
their low impedance at high frequencies, the best type of
capacitor to use is solid tantalum.
L
possible to provide true remote load sensing. Load regulation
will be limited by the resistance of the wire connecting the
regulator to the load. For the data sheet specification,
regulation is measured at the bottom of the package. Negative
side sensing is a true Kelvin connection, with the bottom of the
output divider returned to the negative side of the load.
Although it may not be immediately obvious, best load
regulation is obtained when the top of the divider is connected
directly to the case, not to the load. This is illustrated in Figure
18. If R
between the regulator and the load would be
ratio. R
translates to 4mV/ft. at 1A load current, so it is important to
keep the positive lead between regulator and load as short as
possible.
YPASS
OAD
Input bypassing using a 1μF tantalum or 25μF electrolytic is
Because the SG117A is a three-terminal device, it is not
Connected as shown, R
R
TM
P
EGULATION
C
1
R
is about 0.004Ω per foot using 16 gauge wire. This
APACITORS
were connected to the load, the effective resistance
P
Improved
•
Figure 21 – Improving Ripple Rejection
⎛
⎜ ⎜
⎝
Figure 20 – Remote Sensing
R
2
R
+
1
R
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: [phone]
1
ripple
⎞
⎟ ⎟
⎠
,
R
P
P
A P P L I C A T I O N I N F O R M A T I O N ( C O N T I N U E D )
is not multiplied by the divider
=
Parasitic
rejection
Line
(80dB)
Resistance
Integrated Products Division
®
can
Microsemi
be
1.5A Three Terminal Adj. Voltage Regulator
SG117 / 217 / 317 / 117A / 217A / 317A
Figure 24 – 2816 EEPROM Supply Programmer for Read / Write
Control
Figure 25 – Temperature Compensated Lead Acid Battery
Charger
Figure 23 – 21V Programming Supply for UV Prom/ EEPROM
Figure 22 – 5V Regulator with Shut Down
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