SRL05A-xx
Series
Miniature Surface Mount
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)
•
Miniature SMT Construction
•
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
0.80 x 0.45 x 0.24 Inches (20.3 x 11.43 x 6.09 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)
SRL05A-05-3.3
5.0
0.0
SRL05A-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
SRL05A-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 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.
SRL05A-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
SRL05A-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
SRL05A-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
SRL05A
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 5),
as shown in the diagram above.
The output voltage of the
SRL05A-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
SRL05A-05-3.3 - V
IN
= 5 VDC, V
OUT
= 3.3 VDC
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SRL05A-12-5.0 - V
IN
= 12 VDC, V
OUT
= 5.0 VDC
SRL05A-05-3.3 - V
IN
= 5 VDC, V
OUT
= 2.5 VDC
SRL05A-12-5.0 - V
IN
= 12 VDC, V
OUT
= 3.3 VDC
SRL05-05A-3.3 - V
IN
= 5 VDC, V
OUT
= 1.8 VDC
SRL05A-12-5.0 - V
IN
= 12 VDC, V
OUT
= 2.5 VDC
SRL05A-05-3.3 - V
IN
= 5 VDC, V
OUT
= 1.5 VDC
SRL05A-12-5.0 - V
IN
= 12 VDC, V
OUT
= 2.0 VDC
SRL05A-05-3.3 - V
IN
= 5 VDC, V
OUT
= 1.2 VDC
SRL05A-12-5.0 - V
IN
= 12 VDC, V
OUT
= 1.5 VDC
SRL05A-05-3.3 - V
IN
= 5 VDC, V
OUT
= 0.75 VDC
SRL05A-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 across 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:
SRL05A
regulators do not include an internal fuse. For safety and protection,
a external slow-blow fuse should be placed in the input (+VIN) line. A 10A
fuse is recommended for the
SRL05A-05
and a 7A fuse for the
SRL05A-12.
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 signifi-
cantly reduce ripple caused by the switching action of the POL, the
SRL05A
includes onboard filtering. However, adding input capacitors C1 and C2 will
further reduce ripple currents (C1) and high frequency noise spikes (C2).
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:
Suggested Board Layout
Input Filter:
C
1
33
µF
to 250
µF
Remote ON/OFF:
Output Trim:
Output Filter:
See note on page 2
See note on page 2
C
2
0.01
µF
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 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.
Pin Connections
Pin
Description
1
+V Input
2 Remote On/Off
4
Common
Pin
5
6
Description
Trim
+V Output
This diagram illustrates a simple board layout
for use with the
SRL05A
series. As recom-
mended, 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.
Mechanical Dimensions
Suggested Solder Reflow Profile
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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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