SRS05A-xx
Series
Miniature, Non-isolated
5A Output, Switching
POL Regulators
Electrical Specifications
Specifications typical @ +25°C, nominal input voltage & rated output current, unless otherwise noted. Specifications subject to change without notice.
Key Features:
•
5A Output Current
•
Efficiency to 94%
•
EN 60950 Approved (UL)
•
Compact SIP Case
•
Wide Input Range
•
Short Circuit Protected
•
Thermal Shutdown
•
Remote On/Off Control
•
Industry Standard Footprint
Input
Parameter
Input Voltage Range
Under Voltage Lockout, Power Up
Under Voltage Lockout, Power Down
Input Filter
Input Reflected Ripple Current
Conditions
5V Input
12V Input
5V Input
12V Input
5V Input
12V Input
Capacitive
See Note 1
Min.
3.0
8.3
Typ.
5.0
12.0
2.0
8.0
1.9
7.9
150
Max.
±1.5
±0.4
±0.2
±0.5
50
20
200
±1.0
±0.03
Continuous (Hiccup Mode)
See Note 5
120
See Note 6
150
Conditions
Min.
Not Isolated
Fixed
Min.
0.0
Typ.
300
Typ.
Max.
Open or V
IN
0.4
1
Max.
Max.
5.5
14.0
Units
VDC
VDC
VDC
mA P-P
Units
%
%
%
mV P-P
mV RMS
µSec
%
%/°C
°C
%
Units
kHz
Units
VDC
mA
Units
°C
°C
%
Output
Parameter
Output Voltage/Current
Output Voltage Tolerance
Line Regulation, See Note 2
Load Regulation
Ripple & Noise (20 MHz)
Transient Recovery Time, See Note 4
Transient Response Deviation
Temperature Coefficient
Short Circuit Protection
Over Temperature Protection
Overload Protection
Conditions
Min.
Typ.
See Model Selection Guide
5V Input
12V Input
I
OUT
= 0% to 100%, V
OUT =
3.3 VDC
See Note 3
50% Load Change
General
Parameter
Isolation Voltage
Switching Frequency
Remote On/Off,
See Note 7
Parameter
Unit On
Unit Off
On/Off Current
Conditions
Logic High
Logic Low
V
ON
/V
OFF
= 0.0V
Conditions
MicroPower Direct
292 Page Street
Suite D
Stoughton, MA 02072
USA
T:
(781) 344-8226
F:
(781) 344-8481
E:
sales@micropowerdirect.com
W:
www.micropowerdirect.com
Environmental
Parameter
Operating Temperature Range
Storage Temperature Range
Cooling
Humidity
Physical
Size
Weight
Min.
Typ.
Max.
Ambient
-40
+25
+85
-55
+125
Free Air Convection (See Derating Curves)
RH, Non-condensing
93
0.90 x 0.40 x 0.22 Inches (22.9 x 10.16 x 5.6 mm)
0.081 Oz (2.3g)
Conditions
Min.
Typ.
MIL HDBK 217F, 25°C, Gnd Benign
1.5
UL 60950, EN 60950
Max.
Units
MHours
Reliability Specifications
Parameter
MTBF
Safety Standards
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Model Selection Guide
Model
Number
Input
Voltage
(VDC)
Current
(mA)
Voltage
Range
Full-Load No-Load
(VDC)
949
25
0.75
1,412
30
1.20
1,724
30
1.50
3.0 - 5.5
2,022
35
1.80
2,222
35
2.00
2,217
35
2.50
4.5 - 5.5
3,511
35
3.30
428
20
0.75
625
25
1.20
762
25
1.50
893
30
1.80
8.3 - 14.0
980
30
2.00
1,197
35
2.50
1,545
45
3.30
2,264
50
5.00
Output
Current
(A, Max)
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Current
(A, Min)
Efficiency Capacitive Fuse Rating
Load
Slow-Blow
(%, Typ)
(µF Max)
(A)
SRS05A-05-3.3
5.0
0.0
SRS05A-12-5.0
5.0
0.0
79
85
87
89
90
92
94
73
80
82
84
85
87
89
92
3,000
10
3,000
7
Notes:
1. Measured over a bandwidth of 5 Hz to 20 MHz using a 1 µH inductor.
2. Line regulation is measured for a V
IN
change from low line to high line, with
V
OUT
set to 1.8 VDC.
3. 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. For the
SRS05A-12-5.0,
when set for
a 5 VDC output, the output ripple and noise is:
Peak to Peak
RMS
75 mV P - P
45 mV RMS
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 5) 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.
SRS05A-12-5.0
V
OUT
(VDC)
0.75
1.20
1.50
1.80
2.00
2.50
3.30
5.00
R
TRIM
(k )
Open
22.33
13.00
9.00
7.40
5.00
3.12
1.47
4. Transient recovery is measured to within a 1% error band for a 50% load change.
5. 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 temperature decreases, the unit will
automatically restart.
6. 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.
7. Standard units feature an active high remote control input. See the note
and diagram at right.
8. 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.
Output Voltage Trim
SRS05A-05-3.3
V
OUT
(VDC)
0.75
1.20
1.50
1.80
2.00
2.50
3.30
3.63
R
TRIM
(k )
Open
41.71
22.98
14.96
11.75
6.93
3.15
2.20
The output voltage of the
SRS05A-05-3.3
models is adjustable over the range of 0.75
VDC to 3.63 VDC. The required resistor value
for various output levels is given in the table
above. To calculate the correct value for a
different output level, the formula is:
The output voltage level of the
SRS05A
series is adjustable over a wide range
by the simple addition of an external
resistor. This trim resistor is connected
between the circuit common and the trim
input (pin 2), as shown in the diagram
above.
The output voltage of the
SRS05A-12-5.0
models is adjustable over the range of 0.75
VDC to 5.00 VDC. The required resistor value
for various output levels is given in the table
above. To calculate the correct value for a
different output level, the formula is:
R
TRIM
= (
21, 070
- 5, 110)
V
OUT
- 0.75
R
TRIM
= (
10, 500
- 1, 000)
V
OUT
- 0.75
Where: R
TRIM
= The external trim resistor
V
OUT
= The desired output voltage
If a trim resistor is not connected, the output
goes to 0.75 VDC.
Where: R
TRIM
= The external trim resistor
V
OUT
= The desired output voltage
If a trim resistor is not connected, the output
goes to 0.75 VDC.
292 Page Street Ste D Stoughton, MA 02072
•
TEL: (781) 344-8226
•
FAX: (781) 344-8481
•
E-Mail: sales@micropowerdirect.com
Derating Curves
SRS05A-05-3.3 - V
IN
= 5 VDC, V
OUT
= 3.3 VDC
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SRS05A-12-5.0 - V
IN
= 12 VDC, V
OUT
= 5.0 VDC
SRS05A-05-3.3 - V
IN
= 5 VDC, V
OUT
= 2.5 VDC
SRS05A-12-5.0 - V
IN
= 12 VDC, V
OUT
= 3.3 VDC
SRS05-05A-3.3 - V
IN
= 5 VDC, V
OUT
= 1.8 VDC
SRS05A-12-5.0 - V
IN
= 12 VDC, V
OUT
= 2.5 VDC
SRS05A-05-3.3 - V
IN
= 5 VDC, V
OUT
= 1.5 VDC
SRS05A-12-5.0 - V
IN
= 12 VDC, V
OUT
= 2.0 VDC
SRS05A-05-3.3 - V
IN
= 5 VDC, V
OUT
= 1.2 VDC
SRS05A-12-5.0 - V
IN
= 12 VDC, V
OUT
= 1.5 VDC
SRS05A-05-3.3 - V
IN
= 5 VDC, V
OUT
= 0.75 VDC
SRS05A-12-5.0 - V
IN
= 12 VDC, V
OUT
= 0.75 VDC
Temperature Measurement
These switching regulators may be used in a wide variety of thermal environments, but must
be properly cooled to ensure long reliable operation. The derating curves shown above are
approximations of the ambient temperature and airflow required to maintain the switching
regulator temperature below its maximum rating.
Airflow should move parallel to the long axis of the unit, as shown at left. Proper cooling can
be verified by measuring the temperature at pin six of Q
1
(as shown at left). The thermocouple
should be mounted approximately 0.5 in. off the unit board. The temperature at this location
should not exceed 110°C.
MicroPower Direct
•
292 Page Street Ste D Stoughton, MA 02072
•
TEL: (781) 344-8226
•
FAX: (781) 344-8481
•
E-Mail: sales@micropowerdirect.com
Typical Connection
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Notes:
Fuse:
SRS05
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 recom-
mended for the
SRS05A-05
and a 7A fuse
for the
SRS05A-12.
The unit must be connected to a low AC
impedance source, and to avoid loop sta-
bility issues, the source inductance should
also be low. To significantly reduce ripple
caused by the switching action of the POL,
the
SRS05A
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
Suggested Board Layout
This diagram illustrates a simple
board layout for use with the
SRS05A
series. As recom-
mended, external components
are placed as close to the unit
as possible. To help shield exter-
nal circuitry, the ground plane
has been extended under the
unit. Any signal traces should
not be routed underneath the
unit (unless they are on a layer
under the ground plane) to avoid
unwanted noise interference.
Input Filter:
Remote ON/OFF:
Output Trim:
Output Filter:
See note on page 2
See note on page 2
Output filtering is not required, but may be
used to further reduce output ripple &
noise; or to adjust the transient response
Mechanical
time of the unit. Care must be taken not
to exceed 3,000
µF,
the maximum value
of output capacitance the unit is rated
for. The values given in the connection
diagram are typical for light filtering.
Dimensions
Pin Connections
Pin
1
2
3
4
5
Description
+V Output
Trim
Common
+V Input
Remote On/Off
Notes:
•
All dimensions are typical in inches (mm)
•
Tolerance x.xx =
±
0.02 (
±
0.50)
MicroPower Direct
We Power Your Success - For Less!
292 Page Street Ste D Stoughton, MA 02072
•
TEL: (781) 344-8226
•
FAX: (781) 344-8481
•
E-Mail: sales@micropowerdirect.com
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