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Military DC-DC Converters
Series LFB/LMB Single and Series LFB/LMB Dual
Isolated Regulated 75 Watts, Wide Input Range/36-72 VDC
Fully Regulated, Short Circuit Protected
Parallel Operation Available
Features:
Dual isolated outputs
Short circuit protection
Input voltage protection
Thermal, over temp. shutdown
Line regulation
Load regulation
No external components required
Hi density, hi efficiency design
Remote shutdown
Trim capabilities
Fixed frequency-100 Khtz
46 Standard Models
For all variations, call factory.
For Parallel Operation: Add suffix "P"
(i.e. LFB /LMB 5SP). Consult factory to optimize for
your application.
Series LFB : (-40º C to +85º C Operating Temperature)
Series LMB : (-55º C to +85º C Operating Temperature)
Typical Characteristics:
Frequency:
100 Khtz
Base plate:
Max. +85º C
Operating temperature:
See thermal chart: -40º C to
+85º C base plate, -55º C to +85º C base plate.
Test conditions:
25º C ambient
Isolation Base Input:
2121 VDC
Isolation Input Output:
4242 VDC
Isolation Output to Base:
1000 VDC
Storage temperature:
-55º C to +105º C
Surge:
Meets MIL STD 704
Vibration:
Meets MIL STD 202 Method 204 Cond. D
Humidity:
Meets MIL STD 202 Method 106
Shock:
Meets MIL STD 202 Method 213 Cond. I
Altitude:
Meets MIL STD 202 Method 105 Cond. D
Selected MIL STD 883 Options also Available
Stabilization Bake:
MIL STD 883 Method 1008 24 Hrs TA=125º C
Burn In:
MIL STD 883 Method 1015 160 Hrs at 90º C, case
Temperature Cycle:
MIL STD 883, -55ºC to +105ºC, Method 1010 Cond. B
The PICO LFB and LMB Series of high power DC-DC Converters, allow a wide input voltage of 36-72 VDC, while
maintaining a regulated output. They are fully safeguarded for over voltage, over temperature and continuous short
circuit protection.
The availability of Dual Isolated outputs, small size, and the capability of parallel operation as standard features
should reduce your design and component costs, while the fixed frequency operation helps parallel connections for
higher power requirements.
This high density unit is assembled in the USA with PICO quality and component selection, allowing it to meet the
most stringent commercial requirements.
Series LFB/LMB Single * 75 Watts * Input 36-72 VDC
Max.
Max.
Line
EFF.
Load
Regulation
Input
Max.
Full
Regulation
At Full
Volt. Output Output
Load
(%)**
Load
Range Voltage Power
Typical
(%)
(V
(V DC)
*
**
DC)
(W)
(%)
10 - 50-
36-
48-
50% 100% 48V
36-72
36-72
36-72
36-72
36-72
36-72
36-72
36-72
36-72
36-72
3.3
5
5.2
9
12
15
24
28
48
100
30
50
50
65
75
75
75
75
75
75
74
80
80
84
84
84
87
87
85
85
1.5
1.0
1.0
1.0
0.75
0.75
0.5
0.5
0.5
0.5
1.5
1.0
1.0
1.0
0.75
0.75
0.5
0.5
0.5
0.5
0.75
0.75
0.75
0.75
0.5
0.5
0.5
0.5
0.5
0.5
Output
Series LFB
Series LMB
Voltage
Single
Single
Ripple Output
(Full Voltage (-40º C to +85º (-55º C to +85º
C)
C)
Load)
Toler.
1-1MHz
**
BW
(± %)
Pico
Price
Pico
Price
(MV P-
Part
(US
Part
(US
72V
P)
Number
$)
Number
$)
0.75
0.75
0.75
0.75
0.5
0.5
0.5
0.5
0.5
0.5
50
50
50
50
50
50
50
50
50
100
2.0
1.5
1.5
1.0
1.0
1.0
0.5
0.5
0.5
0.5
LFB3.3S
LFB5S
LFB5.2S
LFB9S
LFB12S
LFB15S
LFB24S
LFB28S
LFB48S
324.92 LMB3.3S 455.50
324.92
LMB5S
455.50
324.92 LMB5.2S 455.50
324.92
324.92
324.92
324.92
324.92
324.92
LMB9S
LMB12S
LMB15S
LMB24S
LMB28S
LMB48S
455.50
455.50
455.50
455.50
455.50
455.50
LFB100S 487.38 LMB100S 683.25
10% Minimum load required at all times.
* Using proper thermal management, maximum temp. of +85º C (case)
** Reading taken at nominal 48 VDC input
Series LFB/LMB Dual * 75 Watts * Input 36-72 VDC
Max.
Load
Regulation
(%)**
Max.
Line
Regulation
At Full
Load
(%)
36-
48V
0.75
0.75
0.5
0.5
0.5
0.5
0.5
EFF.
Input
Max.
Full
Volt. Output Output
Load
Range Voltage Power
Typical
(V
(V DC)
*
**
DC)
(W)
(%)
10-50% 50-100%
1
1
0.75
0.75
0.5
0.5
0.5
1
1
0.75
0.75
0.5
0.5
0.5
Output
Series LFB
Series LMB
Voltage
Dual
Dual
Ripple Output
(Full Voltage (-40º C to +85º (-55º C to +85º
C)
C)
Load)
Toler.
1-1MHz
**
BW
(± %)
Pico
Price
Pico
Price
48- (MV P-
Part
(US
Part
(US
72V
P)
Number
$)
Number
$)
0.75
0.75
0.5
0.5
0.5
0.5
0.5
50
50
50
50
50
50
50
1.5
1
1
1
0.5
0.5
0.5
LFB5D
LFB9D
LFB12D
LFB15D
LFB24D
LFB28D
LFB48D
438.27
438.27
438.27
438.27
438.27
438.27
438.27
LMB5D
LMB9D
LMB12D
LMB15D
LMB24D
LMB28D
LMB48D
614.39
614.39
614.39
614.39
614.39
614.39
614.39
36-72
36-72
36-72
36-72
36-72
36-72
36-72
5
9
12
15
24
28
48
50
65
75
75
75
75
75
80
84
84
85
87
87
85
10% Minimum load required at all times.
* Using proper thermal management, maximum temp. of +85º C (case)
** Reading taken at nominal 48 VDC input
****HIGH VOLTAGE SERIES LFB/ LMB
TO 250 VDC - 50 WATTS - INPUT 36-72 VDC
MAX. LINE
OUTPUT
MAX. LOAD REGULATION
SERIES LFB
SERIES LMB
VOLTAGE
AT FULL
SINGLE
SINGLE
EFF. REGULATION
RIPPLE
OUTPUT
(%)**
LOAD
-40ºC TO +85ºC (-55ºC TO +85ºC)
INPUT
MAX.
@
OUTPUT
FULL
VOLTAGE
(%)
VOLTAGE
OUTPUT FULL
VOLTAGE
LOAD
Tolerance
RANGE
POWER LOAD
(V DC)
1-1MHz
(±%)**
PICO
PICO
(V DC)
(W)*
TYP.
20-
50-
36-
48-
PRICE
PRICE
BW
PART
PART
(%)** 50% 100%
48V
72V
(US $)
(US $)
(%)
NUMBER
NUMBER
36-72
36-72
36-72
36-72
36-72
36-72
125
150
175
200
225
250
50
50
50
50
50
50
84
84
84
84
84
84
0.5
0.5
0.5
0.5
0.5
0.5
0.5
0.5
0.5
0.5
0.5
0.5
0.3
0.3
0.3
0.3
0.3
0.3
0.3
0.3
0.3
0.3
0.3
0.3
1
1
1
1
1
1
0.5
0.5
0.5
0.5
0.5
0.5
LFB125S
LFB150S
LFB175S
LFB200S
LFB225S
LFB250S
487.38
487.38
487.38
649.85
649.85
649.85
LMB125S
LMB150S
LMB175S
LMB200S
LMB225S
LMB250S
683.25
683.25
683.25
911.00
911.00
911.00
10% Minimum load required at all times
*Using proper thermal management, maximum temp of +85ºC (case)
**Reading taken at nominal 48 VDC input
****UL approval recognition pending
VIEW HEAT SINKS
GO TO APPLICATION NOTES
GO TO MECHANICAL CONFIGURATION
(http://www.picoelectronics.com/node/13342) (http://www.picoelectronics.com/node/13343) (http://www.picoelectronics.com/node/13347)
Larger Version of Graph
(http://www.picoelectronics.com/sites/all/staticpage_images/pe115gb.jpg)
For immediate engineering assistance or to place an order:
Call Toll Free: 800-431-1064
PICO Electronics, Inc.
143 Sparks Ave. Pelham, NY 10803-1810
Tel: 914-738-1400 Fax: 914-738-8225
(http://www.webstat.com/free_web_statistics.php)
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