LF300RU
Series
Very Wide Input, 3W SMT
Single & Dual Output
DC/DC Converters
Electrical Specifications
Specifications typical @ +25°C, nominal input voltage & rated output current, unless otherwise noted. Specifications subject to change without notice.
Input
Key Features:
•
3W Output Power
•
Wide 4:1 Inputs
•
Miniature SMT Case
•
Tight Line/Load Regulation
•
1,500 VDC Isolation
•
-40ºC to +71ºC Operation
•
14 Standard Models
•
1.0 MH MTBF Minimum
•
Industry Standard Pin-Out
Parameter
Input Start Voltage
Reverse Polarity Input Current
Short Circuit Input Power
Input Filter
Conditions
24 VDC Input
48 VDC Input
Max.
8.5
17.0
1.0
2,000
π
(Pi) Filter (Meets EN55022 Class A)
Min.
Typ.
±0.5
±0.5
±0.2
±0.3
50
Max.
±1.0
±2.0
±1.0
±1.0
75
100
15
500
±6
±0.02
Min.
4.5
8.5
Typ.
6.0
12.0
Units
VDC
A
mW
Output
Parameter
Output Voltage Accuracy
Output Voltage Balance
Line Regulation
Load Regulation
Ripple & Noise (20 MHz) (Note 1)
Ripple & Noise (20 MHz)
Ripple & Noise (20 MHz)
Output Power Protection
Transient Response Time (Note 2)
Transient Response Deviation
Temperature Coefficient
Output Short Circuit
Conditions
Dual Output, Balanced Load
For Vin = Min to Max
Iout = 10% to 100%
Units
%
%
%
%
mV P - P
mV P - P
mV rms
%
µS
%
%/
º
C
120
25% Load Step Change
150
±2
±0.01
Continuous (Autorecovery)
Min.
1,500
1,000
Typ.
RoHS Compliant
General
Parameter
Isolation Voltage
Isolation Resistance
Isolation Capacitance
Switching Frequency
Conditions
60 Seconds
1,000 VDC
100 kHz, 1V
Max.
Units
VDC
MΩ
pF
kHz
Units
350
300
500
Environmental
Parameter
Operating Temperature Range
Operating Temperature Range
Storage Temperature Range
Cooling
Humidity
Conditions
Min.
Typ.
Ambient
-40
+25
Case
-40
-40
Free Air Convection
RH, Non-condensing
Max.
+71
+90
+125
95
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
º
C
º
C
º
C
%
Physical
Case Size
Case Material
Weight
1.27 x 0.58 x 0.40 Inches (32.3 x 14.8 x 10.2 mm)
Non-Conductive Black Plastic (UL94-V0)
0.31 Oz (8.8g)
Conditions
MIL HDBK 217F, 25
º
C, Gnd Benign
Conditions
24 VDC Input
48 VDC Input
1.5 mm From Case For 10 Sec.
All Models
Min.
1.0
Min.
-0.7
-0.7
Typ.
Max.
Units
MHours
Units
VDC
ºC
mW
Reliability Specifications
Parameter
MTBF
Absolute Maximum Ratings
Parameter
Input Voltage Surge (1 Sec)
Lead Temperature
Internal Power Dissipation
Typ.
Max.
50.0
100.0
260
2,500
Caution: Exceeding Absolute Maximum Ratings may damage the module. These are not continuous operating ratings.
Model Selection Guide
Model
Number
LF301RU
LF302RU
LF303RU
LF304RU
LF305RU
LF306RU
LF307RU
LF311RU
LF312RU
LF313RU
LF314RU
LF315RU
LF316RU
LF317RU
Input
Voltage (VDC)
Nominal
Range
24
9.0 - 36.0
24
9.0 - 36.0
24
9.0 - 36.0
24
9.0 - 36.0
24
9.0 - 36.0
24
9.0 - 36.0
24
9.0 - 36.0
48
18.0 - 75.0
48
18.0 - 75.0
48
18.0 - 75.0
48
18.0 - 75.0
48
18.0 - 75.0
48
18.0 - 75.0
48
18.0 - 75.0
Current (mA)
Full-Load
No-Load
138
20
158
20
154
20
154
20
160
20
154
20
154
20
68
10
78
10
75
10
75
10
78
10
75
10
75
10
Voltage
(VDC)
3.3
5.0
12.0
15.0
±5.0
±12.0
±15.0
3.3
5.0
12.0
15.0
±5.0
±12.0
±15.0
Output
Current
(mA, Max)
750
600
250
200
±300
±125
±100
750
600
250
200
±300
±125
±100
Current
(mA, Min)
75.0
60.0
25.0
27.0
±30.0
±12.5
±10.0
75.0
60.0
25.0
27.0
±30.0
±12.5
±10.0
Reflected
Ripple Cur.
(mA)
Efficiency
(%, Typ)
75
79
81
81
78
81
81
76
80
83
83
80
83
83
10
10
10
10
10
10
10
5
5
5
5
5
5
5
Fuse Rating
Slow-Blow
(mA)
1,000
1,000
1,000
1,000
1,000
1,000
1,000
500
500
500
500
500
500
500
Notes:
1. When measuring output ripple, it is recommended that an external 0.47
µF
ceramic
capacitor be placed from the +Vout pin to the -Vout pin for single output units and from
each output to common for dual output units. For noise sensitive applications, the use of
3.3
µF
capacitors will reduce the output ripple.
2. Transient recovery is measured to within a 1% error band for a load step change of 75%
to 100%.
3. No-load operation will not damage these units, however, they may not meet specifica-
tions.
4. Dual output units may provide a 10V, 24V or 30V output. To do this, connect the load
across the positive (+Vout) and negative (-Vout) outputs and float the output common.
5. The converter should be connected to a low ac-impedance source. An input source with
a highly inductive impedance may affect the stability of the converter. In applications
where the converter output loading is high and input power is supplied over long lines,
it may be necessary to use a capacitor on the input to insure start-up. In this case, it is
recommended that a low ESR (ESR <1.0Ω at 100 kHz) capacitor be mounted close to the
converter. For 24V input units a 4.7
µF
is recommended, and for 48V units a 2.2
µF.
6. Maximum capacitive load for single output units is 3,000
µF,
for dual output models it is
180
µF
for each output.
7. It is recommended that a fuse be used on the input of a power supply for protection. See
the table above for the correct rating.
Derating Curve
Mechanical Dimensions
Remote ON/OFF
Parameter
Supply On
Supply Off
Standby Input Current
Control Common
Condition
Units
2.5 to 5.5 or Open Circuit
VDC
-0.7 to 0.8
VDC
10
mA
Referenced to Negative Input (-Vin)
Remote ON/OFF Notes:
1. Maximum sink current at the on/off pin (pin 1) during a logic
low is 300
µA.
2. Maximum allowable leakage current of a switch connected to the
on/off terminal (Pin 1) at logic high (2.5V to 100V) is 200
µA.
Board Layout
Pin Connections
Pin
1
2
3
10
11
12
13
14
15
22
23
24
Single
Dual
-Vin
-Vin
-Vin
-Vin
On/Off On/Off
NC
Common
NC
NC
NC
-Vout
+Vout
+Vout
NC
NC
-Vout Common
NC
NC
+Vin
+Vin
+Vin
+Vin
Notes:
•
All dimensions are typical in
inches (mm)
•
Tolerance x.xx =
±
0.01 (
±
0.25)
•
Pin 1 is marked by a “dot” or indentation on the unit
NC:
No Connection
MicroPower Direct
www.micropowerdirect.com
•
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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