SRL10A-12
Miniature Surface Mount
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
•
Wide 9.0V - 14V Input Range
•
Efficiency to 95%
•
EN 60950 Approved (UL)
•
Miniature SMT Construction
•
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
Turn On Delay Time
Input Filter
Input Reflected Ripple Current
Conditions
V
OUT
4.5V
Turn On Voltage Threshold
Turn Off Voltage Threshold
Lockout Hysteresis Voltage
I
OUT
= 100%, V
In =
0 to 14 VDC
Input Idle Current
Min.
9.0
Typ.
12.0
8.0
7.7
0.3
Max.
14.0
Units
VDC
VDC
7.0
10
3.5
Capacitive
See Note 1
200
Max.
±1.5
±0.2
±0.5
50
20
200
±0.03
A
mA
mS
mA P-P
Units
%
%
%
mV P-P
mV RMS
µSec
%/°C
°C
A
Units
kHz
Units
VDC
mA
Units
°C
°C
%
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
15
17
Conditions
Min.
Not Isolated
Fixed
Min.
0.0
Typ.
300
Typ.
Max.
Open or V
IN
0.4
1
20
Max.
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
1.3 x 0.53 x 0.346 Inches (33.0 x 13.46 x 8.8 mm)
0.299 Oz (8.5g)
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)
992
40
0.75
1,163
50
1.20
1,404
50
1.50
1,666
60
1.80
9.0 - 14.0
1,823
60
2.00
2,264
60
2.50
2,956
70
3.30
4,385
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)
SRL10A-12-5.0
10.0
0.0
82
86
89
90
91
92
93
95
8,000
20
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 2) 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:
SRL10A-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 20A 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
SRL10A-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
Remote ON/OFF:
Output Trim:
Remote Sense:
See note above
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:
292 Page Street Ste D Stoughton, MA 02072
•
TEL: (781) 344-8226
•
FAX: (781) 344-8481
•
E-Mail: sales@micropowerdirect.com
Output Voltage Trim
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The output voltage level of the
SRL10A-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,
as shown in the diagram at left.
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:
SRL10A-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
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 is 0.75 VDC.
Suggested Board Layout
This diagram illustrates a simple board layout for
use with the
SRL10A-12
series. As recommended,
external components are placed as close to the
unit as possible. To help shield external 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.
Pin Connections
Pin
1
2
4
Description
+V Input
Sense
Common
Pin
5
6
7
Description
+V Output
Trim
Sense
Suggested Solder Reflow Profile
Mechanical Dimensions
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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