SRS10A-12
Series
Miniature, Non-isolated
10A 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:
•
10A Output Current
•
Efficiency to 95%
•
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
Maximum Input Current
Off Input Current
Input Filter
Input Reflected Ripple Current
Conditions
Min.
8.3
Typ.
12.0
8.0
7.7
0.3
Max.
14.0
Units
VDC
VDC
7.0
10
200
Max.
±1.5
±0.2
±0.5
50
20
200
±0.03
A
mA
mA P-P
Units
%
%
%
mV P-P
mV RMS
µSec
%/°C
°C
%
Max.
Units
kHz
Units
VDC
mA
Units
°C
°C
%
Turn On Voltage Threshold
Turn Off Voltage Threshold
Lockout Hysteresis Voltage
I
OUT
= 100%, V
In =
0 to 14 VDC
Input Idle Current
Capacitive
See Note 1
Output
Parameter
Output Voltage/Current
Output Voltage Tolerance
Line Regulation
Load Regulation
Ripple & Noise (20 MHz)
Transient Recovery Time, See Note 3
Temperature Coefficient
Short Circuit Protection
Over Temperature Protection
Overload Protection
Conditions
Min.
Typ.
See Model Selection Guide
V
IN
= Min to Max
I
OUT
= 0% to 100%
See Note 2
50% Load Change
Continuous (Hiccup Mode)
See Note 4
120
See Note 5
170
Conditions
Min.
Not Isolated
Fixed
Min.
0.0
Typ.
300
Typ.
Max.
Open or V
IN
0.4
1
General
Parameter
Isolation Voltage
Switching Frequency
Remote On/Off,
See Note 6
Parameter
Unit On
Unit Off
On/Off Current
Conditions
Logic High
Logic Low
V
ON
/V
OFF
= 0.0V
Conditions
Environmental
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
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
2.0 x 0.51 x 0.32 Inches (50.8 x 13.0 x 8.3 mm)
0.325 Oz (10.0g)
Conditions
Min.
Typ.
MIL HDBK 217F, 25°C, Gnd Benign
980
UL 60950, EN 60950
Max.
Units
kHours
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)
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)
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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
Derating Curves
SRS10A-12-5.0 - V
IN
= 12 VDC, V
OUT
= 5.0 VDC
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SRS10A-12-5.0 - V
IN
= 12 VDC, V
OUT
= 3.3 VDC
SRS10A-12-5.0 - V
IN
= 12 VDC, V
OUT
= 2.5 VDC
SRS10A-12-5.0 - V
IN
= 12 VDC, V
OUT
= 2.0 VDC
SRS10A-12-5.0 - V
IN
= 12 VDC, V
OUT
= 1.8 VDC
SRS10A-12-5.0 - V
IN
= 12 VDC, V
OUT
= 1.5 VDC
SRS10A-12-5.0 - V
IN
= 12 VDC, V
OUT
= 1.2 VDC
SRS10A-12-5.0 - V
IN
= 12 VDC, V
OUT
= 0.75 VDC
Temperature Measurement
p
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 switch-
ing 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 loca-
tion 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
Suggested Board Layout
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Output Voltage Trim
This diagram illustrates a simple
board layout for use with the
SRS10A-12
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.
The output voltage level of the
SRS10A-12
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
10), as shown in the diagram above.
SRS10A-12-5.0
V
OUT
(VDC)
R
TRIM
(k )
0.75
Open
1.20
22.33
1.50
13.00
1.80
9.00
2.00
7.40
2.50
5.00
3.30
3.12
5.00
1.47
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:
Pin Connections
Pin
1
2
3
4
5
Description
+V Output
Sense
+V Output
+V Output
Common
Pin
6
7
8
10
11
Description
Common
+V Input
+V Input
Trim
Remote On/Off
R
TRIM
= (
10, 500
- 1, 000)
- 0.75
V
OUT
Mechanical Dimensions
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.
MicroPower Direct
We Power Your Success - For Less!
292 Page Street Ste D Stoughton, MA 02072
•
Notes:
•
All dimensions are typical in inches (mm)
•
Tolerance x.xx =
±
0.02 (
±
0.50)
FAX: (781) 344-8481
•
TEL: (781) 344-8226
•
E-Mail: sales@micropowerdirect.com
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