Embedded Power for
Business-Critical Continuity
Eighth-Brick
B Series
Total Power:
Up to 80 Watts
Input Voltage:
36-75 Vdc
No. of Outputs:
Single
Rev. 11.25.08_138
Eighth-Brick B Series
1 of 4
Special Features
• High efficiency topology
• Industry standard eighth-brick foot
print (identical to quarter-brick
pinout)
• Low profile through-hole and
surface mount version
• 38% space savings over quarter-
brick converters
• Wide ambient temperature
range, -40 ºC
to +85
ºC
• 90% to 110% output trim
• 100 V, 100 ms input voltage
transient rated
• Meets basic insulation
requirements of EN60950-1
• Industry standard feature sets:
UVLO, OVP, OCP, OTP, O/P trim,
remote sense
• Regulation to zero load
• Fixed frequency switching
• Fast transient switching
• EU directive 2002/95/EC
compliant for RoHS
Electrical Specifications
*
Output
Voltage adjustability:
Minimum load:
Overshoot:
Undershoot:
Transient Response:
(See Note 1)
Input
Input voltage range:
Input current:
Active high remote ON/OFF
Logic compatibility:
ON
OFF
Undervoltage Lockout:
Start-up time:
(See Note 2)
48 V nominal
No load
Remote OFF
Power up
Power up
Power up
Remote ON/OFF
36-75 Vdc
100 mA
10 mA
TTL compatible ref to -input
>2.4 Vdc
<0.8 Vdc
35.5 V (typ.)
35.5 V (typ.)
25 ms (typ.)
5 ms (typ.)
At turn-on and turn-off
At turn-on and turn-off
90% to 110%
0 A
None
None
5% Vout typ. deviation
40 µs recovery
*All specifications are typical at nominal input,
full load at 25 °C ambient unless otherwise stated.
Safety
• UL/cUL60950-1 CAN/CSA 22.2
• TUV EN/IEC60950-1
Embedded Power for
Business-Critical Continuity
Electrical Specifications
General
Basic insulation:
Switching frequency:
Approvals and
standards:
Material flammability:
Weight:
MTBF:
EMC Characteristics
Immunity:
ESD air enclosure:
Radiated field enclosure:
Conducted:
Input transients:
Thermal performance:
Protection
Short-circuit:
Overvoltage:
Thermal:
115% with automatic recovery
125% Vo (typ) with automatic recovery
125 °C hot spot temperature with
automatic recovery
EN1000-4-2 8 kV/6 kV
EN1000-4-3 10 V/m
EN1000-4-6 10 V
100 V, 100 ms
Operating ambient
temperature
Non-operating
(O/P within spec.)
(O/P within spec.)
(O/P within spec.)
Input/output
Fixed
Telcordia SR-332 Issue 1,
50% stress, 40 °C ambient
2250 V dc
500 kHz
EN60950-1 VDE
UL/cUL60950-1
UL94V-0
20 g (0.70 oz)
4.2 M hours
Notes
Rev. 11.25.08_138
Eighth-Brick B Series
2 of 4
1 di/dt = 1 A/µs, Vin = 48 Vdc, Tc = 25 °C, load change =
50% to 75% lo max. and 75% to 50% lo max. Deviation
varies by model. For further details see Technical
Reference Notes (TRN).
2 Start-up into resistive load.
3 This product is only for inclusion by professional
installers within other equipment and must not be
operated as a stand alone product.
4 Recommended input fusing is up to 10 A HRC 200 V
rated fuse.
5 Warranty: 2 years.
6 through-hole version intended for wave soldering
process.
7 The ‘J’ suffix indicates that these parts are Pb-free
(RoHS 6/6) compliant.
Environmental Characteristics
-40 °C to +85 °C
-40 °C to +125 °C
Ordering Information
Regulation
Output
Voltage
12.0 V
5.0 V
3.3 V
2.5 V
1.8 V
1.5 V
1.2 V
1.0 V
Output
Efficiency
Current
(Typ)
(Max)
6.7
13
20
22
25
25
25
25
92%
92%
91%
90%
89%
88%
86%
85%
Set Point
Accuracy
(Typ)
±1%
±1%
±1%
±1%
±1%
±1%
±1%
±1%
Line
Load
Ripple & Noise Model Number(7)
(Typ)
70 mVp-p
30 mVp-p
30 mVp-p
30 mVp-p
30 mVp-p
25 mVp-p
25 mVp-p
20 mVp-p
LES06B48-12V0REJ
LES13B48-5V0REJ
LES20B48-3V3REJ
LES22B48-2V5REJ
LES25B48-1V8REJ
LES25B48-1V5REJ
LES25B48-1V2REJ
LES25B48-1V0REJ
±0.1%
±0.1%
±0.1%
±0.1%
±0.1%
±0.1%
±0.1%
±0.1%
±0.2%
±0.2%
±0.2%
±0.2%
±0.2%
±0.2%
±0.2%
±0.2%
Part Number System with Options
Product
Family
LES
L = Low Profile
E = 1/8 Brick
S = Single Output
Rated Output
Current
22
22 = 22 Amps,
20 = 20 Amps, etc.
Vintage
B
A = 1st generation
B = 2nd generation
Nominal Rated
Input Voltage
48 -
Type of
Output
2V5
Remote
ON/OFF LOGIC
R
Blank = Positive
R = Negative
Body Height, Package Type
and Pin Length
E
A = 0.33 in (8.1 mm),Through Hole
0.19 in (4.8 mm), Pins
E = 0.37 in (9.1 mm), Through Hole
0.19 in (4.8 mm), Pins
S = 0.33 in (8.1 mm), Surface Mount
RoHS
Compliance (7)
J
J = Pb free (RoHS
6/6 compliant)
48 = 48 Volts
2V5 = 2.5 Volts
(36 - 75 VDC range) 3V3 = 3.3 Volts
Embedded Power for
Business-Critical Continuity
CAL DETAILS AND DIMENSION OPTIONS FOR PTH PIN (LES B SERIES)
Through-hole Mechanical Drawing (for 1.8, 1.5, 1.2 and 1.0 V)
2.30 [58.4]
Rev. 11.25.08_138
Eighth-Brick B Series
3 of 4
1
2
0.30 [7.62]
8
7
6
5
4
2.00 [50.80]
0.90 [22.9]
0.15 [3.8]
3
Clearance
Height
(see table)
(see table)
0.19 [4.8]
0.040 ± 0.004
[1.02 ± 0.10]
(6 pls)
2.30 [58.4]
0.062 ± 0.004
[1.57 ± 0.10]
(2 pls)
0.080 ± 0.004
[ 2.03 ± 0.10]
(2 pls)
0.90 [22.9]
0.30 [7.62]
0.15 [3.81]
Suffix
Height
±0.025 [0.64]
Clearance
Minimum
0.004 (0.10)
0.047 (1.20)
0.15 [3.8]
2.00 [50.80]
RECOMMENDED HOLE PATTERN
0.058 ± 0.004
[ 1.50 ± 0.10]
(6 pls)
A
E
0.33 (8.4)
0.37 (9.4)
Pin Connections
Pin
number
1
2
3
4
5
6
Function
Vin+
ON/OFF
Vin-
Vout-
Sense-
Trim
Sense+
Vout+
Surface-mount Mechanical Drawing (for 1.8, 1.5, 1.2 and 1.0 V)
2.30 [58.4]
1
2
0.30 [7.62]
3
8
7
6
5
4
2.00 [50.80]
7
0.90 [22.9]
0.15 [3.8]
8
Dimensions are in inches (millimeter)
Tolerances (unless otherwise specified)
X.XX±0.02 (X.X±0.5)
X.XXX±0.010 (X.XX±0.25)
0.33 ± 0.025
[6.4 ± 0.64]
0.014 [0.35] Min
2.30 [58.4]
0.062 ± 0.004
[1.57 ± 0.10]
(8 pls)
0.102 ± 0.004
[ 2.60 ± 0.10]
(8 pls)
Lead coplanarity within 0.006 [0.15]
0.90 [22.9]
0.30 [7.62]
0.15 [3.81]
0.15 [3.8]
2.00 [50.80]
RECOMMENDED HOLE PATTERN
Embedded Power for
Business-Critical Continuity
ANICAL DETAILS AND DIMENSION OPTIONS FOR PTH PIN (LES B SERIES)
Through-hole Mechanical Drawing (for 2.5, 3.3, 6 and 12 V)
2.30 [58.4]
Americas
1
2
0.30 [7.62]
8
7
6
5
4
2.00 [50.80]
5810 Van Allen Way
Carlsbad, CA 92008
USA
Telephone: +1 760 930 4600
Facsimile: +1 760 930 0698
0.90 [22.9]
0.15 [3.8]
Rev. 11.25.08_138
Eighth-Brick B Series
4 of 4
Europe (UK)
3
Clearance
Height
(see table)
(see table)
Waterfront Business Park
Merry Hill, Dudley
West Midlands, DY5 1LX
United Kingdom
Telephone: +44 (0) 1384 842 211
Facsimile: +44 (0) 1384 843 355
0.19 [4.8]
0.040 ± 0.004
[1.02 ± 0.10]
(6 pls)
2.30 [58.4]
0.062 ± 0.004
[1.57 ± 0.10]
(2 pls)
0.080 ± 0.0043
[ 2.03 ± 0.10]
(2 pls)
0.90 [22.9]
0.30 [7.62]
0.15 [3.81]
Asia (HK)
14/F, Lu Plaza
2 Wing Yip Street
Kwun Tong, Kowloon
Hong Kong
Telephone: +852 2176 3333
Facsimile: +852 2176 3888
For global contact, visit:
0.15 [3.8]
2.00 [50.80]
NICAL DETAILS AND
RECOMMENDED HOLE PATTERN
DIMENSION OPTIONS FOR SMT PIN (LES SERIES)
Surface-mount Mechanical Drawing (for 2.5, 3.3, 6 and 12 V)
2.30 [58.4]
0.058 ± 0.004
[ 1.50 ± 0.10]
(6 pls)
www.powerconversion.com
techsupport.embeddedpower@
emerson.com
While every precaution has been taken to ensure
accuracy and completeness in this literature, Emerson
Network Power assumes no responsibility, and disclaims
all liability for damages resulting from use of this
information or for any errors or omissions.
1
2
0.30 [7.62]
3
2.00 [50.80]
0.33 ± 0.025
[8.4 ± 0.64]
8
7
6
5
4
0.90 [22.9]
0.15 [3.8]
Emerson Network Power.
The global leader in enabling
business-critical continuity.
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©2008 Emerson Electric Co.
Lead coplanarity within 0.006 [0.15]
0.062 ± 0.004
[1.57 ± 0.10]
(8 pls)
0.102 ± 0.004
[ 2.60 ± 0.10]
(8 pls)
0.90 [22.9]
2.30 [58.4]
0.30 [7.62]
0.15 [3.81]
0.15 [3.8]
2.00 [50.80]
RECOMMENDED HOLE PATTERN
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