Model Selection Guide
Model
Number
Input
Voltage
(VDC)
Current
(mA)
Voltage
Range
Full-Load No-Load
(VDC)
2,956
40
0.75
2,956
50
1.20
2,956
50
1.50
2,956
60
1.80
8.3 - 14.0
2,956
60
2.00
2,956
60
2.50
2,956
70
3.30
2,956
70
5.00
Output
Current
(A, Max)
www.micropowerdirect.com
Current
(A, Min)
Efficiency Capacitive Fuse Rating
Load
Slow-Blow
(%, Typ)
(µF Max)
(A)
SRS10A-12-5.0
10.0
0.0
82
86
89
90
91
92
93
95
8,000
10
Notes:
1. Measured over a bandwidth of 5 Hz to 20 MHz using a 1 µH inductor.
2. Output ripple is measured at 20 MHz bandwidth using a 1.0 µF
ceramic capacitor and a 10 µF tantalum capacitor connected in
parallel as close to the output terminals as possible.
3. Transient recovery is measured to within a 200 mV error band for a
50% load change.
4. These units include a non-latching over temperature protection
circuit. If the temperature exceeds approximately 120°C at the
monitored “hot spot”, the unit will be shut down. When the tem-
perature decreases, the unit will automatically restart. See page 3
for temperature measurement information.
5. These units will provide up to 150% of rated current. In the event of
an over current fault, the unit will go into hiccup mode until the fault
is removed.
6. Standard units feature an active high remote control input. See the
note and diagram at right.
7. These units do not include an internal fuse. It is recommended that
an external slow-blow fuse be used with a rating as shown in the
table above.
Remote On/Off
These units include an active high
On/OFF control input. The unit is
“ON” if the input to the control pin
(pin 11) is high; or if the pin is left
open (or floating). The signal level
of the control input is referenced
to ground. A recommended drive
circuit for the control pin is shown
at left. The resistors R
1
& R
2
have
been added to help reduce pos-
sible false triggering of the control
input due to leakage currents.
Units are available with an active
low control input. With this input,
the unit will remain off if the con-
trol input remains above 2.8 VDC.
For more information on the active
low option, contact the factory.
Typical Connection
Notes:
Fuse:
SRS10A-12
regulators do not include an internal fuse. For
safety and protection, a external slow-blow fuse should be
placed in the input (+V
IN
) line. A 10A fuse is recommended.
The unit must be connected to a low AC impedance source,
and to avoid loop stability issues, the source inductance
should also be low. To significantly reduce ripple caused by
the switching action of the POL, the
SRS10A-12
includes
onboard filtering. However, adding input capacitors C
1
and
C
2
will further reduce ripple currents (C
1
) and high frequency
noise spikes (C
2
). These capacitors should be placed as
close to the input pins as possible (see board layout at right).
It is recommended that low ESR (<100 m ) and low ESL
ceramic capacitors be used. Recommended values are:
C
1
33
µF
to 250
µF
C
2
0.01
µF
Output Trim:
Remote Sense:
See note on page 4
The remote sense helps regulate the output voltage at
the point of load by minimizing the effects of distribution
losses. The voltage between the sense pin (Pin 3) and
the point of load should not exceed 500 mV. When using
the remote sense function, the output voltage level may
rise. Care must be taken not to exceed the maximum
rated output power of the regulator. When not in use, the
remote sense pin should be tied to the output pin of the
regulator.
Output filtering is not required, but may be used to further
reduce output ripple & noise; or to adjust the transient
response time of the unit. Care must be taken not to exceed
8,000
µF,
the maximum value of output capacitance the
unit is rated for. The values given in the connection dia-
gram are typical for light filtering.
Input Filter:
Output Filter:
Remote ON/OFF:
See note above
292 Page Street Ste D Stoughton, MA 02072
•
TEL: (781) 344-8226
•
FAX: (781) 344-8481
•
E-Mail: sales@micropowerdirect.com
MPD [ MICROPOWER DIRECT, LLC ]
