Embedded Power for
Business-Critical Continuity
LES20B
Eighth-Brick B Series
Single output
Total Power:
Up to 66W
Input Voltage: 33 - 75VDC
# of Outputs: Single
Rev.03.19.07
LES20B
1 of 4
Electrical Specifications*
Special Features
• High efficiency topology
• Industry standard eighth-
brick footprint (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 °C to +85 °C
• 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 and
OTP
• Regulation to zero load
• Fixed frequency switching
• Fast transient switching
• EU directive 2002/95/EC
compliant for RoHS
• 2 year warranty
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)
Power up
Power down
Power up
Remote ON/OFF
48 V nominal
No load
Remote OFF
36-75 Vdc
100 mA
10 mA
TTL compatible ref to -input
>2.4 Vdc
<0.8 Vdc
35 V (typ.)
32 V (typ.)
25 ms (typ.)
5 ms (typ.)
At turn-on and turn-off
At turn-on and turn-off
90% to 110%
0%
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
VDE EN/IEC60950-1
CB Report and Certificate to
IEC60950
Embedded Power for
Business-Critical Continuity
Electrical Specifications Contd.
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
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
Protection
Short-circuit
Overvoltage
Thermal
115% with automatic recovery
125% Vo (typ) with automatic recovery
125 °C hot spot temperature with
automatic recovery
INPUT
CURRENT
(MAX.)
(4)
1.80 A
2.10 A
2.10 A
2.5 A
INPUT
RIPPLE
CURRENT
(5)
250 mA
250 mA
250 mA
250 mA
OUTPUT
CURRENT
(MAX.)
22 A
20 A
13 A
6.7 A
REGULATION
SET POINT
ACCURACY
MAX
2.5 V
3.3 V
5.0 V
12.0 V
90.5%
91%
92.5%
92%
±1.5%
±1.5%
±1.5%
±1.5%
±0.1%
±0.1%
±0.1%
±0.1%
±0.2%
±0.2%
±0.2%
±0.2%
RIPPLE &
LINE
LOAD
NOISE
(pk - pk)
30 mV
30 mV
30 mV
50 mV
LES22B48-2V5J
LES20B48-3V3J
LES13B48-5V0J
LES06B48-12V0J
Notes
Rev.03.19.07
LES20B
2 of 4
Input/output
Fixed
2250 V dc
500 kHz
EN60950-1 VDE
UL/cUL60950-1
UL94V-0
20 g (0.70 oz)
1
2
3
4
5
6
7
Telcordia SR-332 Issue 1
rated output power
>1,000,000 hours
(O/P within spec.)
(O/P within spec.)
(O/P within spec.)
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 longform
datasheets.
Start-up into resistive load.
This product is only for inclusion by professional
installers within other equipment and must not be
operated as a stand alone product.
Recommended input fusing is up to 10 A HRC 200 V
rated fuse.
Peak to peak measured with no external Pi filter.
Significant reduction possible with external filter. See
Longform Datasheet for further details.
Please consult factory to check availability.
The ‘J’ suffix indicates that these parts are Pb-free (RoHS
6/6) compliant. TSE RoHS 5/6 (non Pb-free) compliant
versions may be available on special request, please
contact your local sales representative for details.
Environmental Characteristics
-40 °C to +85 °C
-40 °C to +125 °C
OUTPUT
VOLTAGE
EFFICIENCY
(TYP.)
MODEL
NUMBER
(7)
Table 1 - Output Ratings
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
48 = 48 Volts
(36 - 75 VDC range)
Type of
Output
2V5
2V5 = 2.5 Volts
3V3 = 3.3 Volts
Remote
ON/OFF LOGIC
R
Blank = Positive
R = Negative
Body Height, Package Type
and Pin Length
A
A = 0.32 in (8.1 mm),Through Hole
0.19 in (4.8 mm), Pins
E = 0.36 in (9.1 mm), Through Hole
0.19 in (4.8 mm), Pins
S = 0.32 in (8.1 mm), Surface Mount
RoHS
Compliance
(7)
J
J = Pb free (RoHS
6/6 compliant)
Embedded Power for
Business-Critical Continuity
Specifications Contd.
Rev.03.19.07
LES20B
3 of 4
Figure 1 - Through-Hole Mechanical Drawing
PIN CONNECTIONS
PIN NUMBER
1
2
3
4
5
6
7
8
FUNCTION
Vin+
ON/OFF
Vin-
Vout-
Sense-
Trim
Sense+
Vout+
OPTION
A
E
DIMENSION OPTIONS
CLEARANCE
0.010 (0.25) typ.
0.040 (1.02) Typ.
HEIGHT
0.32 (8.1) typ.
0.36 (9.1) typ.
Pinout Tableand Dimension Options Table
Embedded Power for
Business-Critical Continuity
Rev.03.19.07
LES20B
4 of 4
Artesyn
5810 Van Allen Way
Carlsbad, CA 92008
USA
Telephone: +1 760 930 4600
Facsimile: +1 760 930 0698
Europe (UK)
Waterfront Business Park
Merry Hill, Dudley
West Midlands, DY5 1LX
United Kingdom
Telephone: +44 (0) 1384 842 211
Facsimile: +44 (0) 1384 843 355
Asia (HK)
13-15, Shing Wan Road
Tai Wai, Shatin, N. T.
Hong Kong
Telephone: +852 2699 2868
Facsimile: +852 2699 1770
For global contact, visit:
www.artesyn.com
technicalsupport@artesyn.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.
Figure 2 - Surface Mount Mechanical Drawing
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