EIGHTH-BRICK SERIES
Single Output Value Products
Embedded Power for
Business-Critical Continuity
EIGHTH-BRICK
SERIES
Total Power:
50 W
Input Voltage: 36 - 75 VDC
# of Outputs: Single
Rev.09.10.07
eighth-brick series
1 of 31
Special Features
• High efficiency topology and
high output current
• Low profile, 0.300 in (7.62 mm)
height
• Industry standard 1/8 brick
footprint (identical to 1/4 brick
pinout)
• 38% savings in space over
industry standard 1/4 brick
converters
• Wide operating ambient tem-
perature range, -40 °C to +85
°C
• 80% to 110% output trim
• Basic insulation
• Overvoltage and overtempera-
ture protection
• Remote ON/OFF
• Approvals to EN60950-1 VDE
and UL/cUL60950
• 100 V, 100 ms input voltage
transients rated
• Monotonic startup into normal
and prebiased loads
• Secondary side control, no
optocouplers, fast transient
response
• Available RoHS compliant
• 2 year warranty
NOTICE SOME MODELS LISTED IN THIS
DOCUMENT HAVE BEEN DISCONTINUED
Please contact your local Artesyn representative
or use the on line model number search tool at
http://www.artesyn.com/powergroup/products.htm
to find a suitable alternative.
The Eighth-Brick Value series is a new low cost, high
efficiency, open frame, isolated, up to 25 A converter in an
industry standard eighth-brick footprint and operates from a 36
Vdc to 75 Vdc supply. This new series elevates the power density
threshold for high-end application design requirements where
high output current at low voltages are required. The converter
architecture takes advantage of open-frame construction to
provide low mass and a low thermal impedance for a single board
design.
Additionally, a patent pending, full wave coupled inductor
topology yields some of the highest full load efficiencies in the
industry. All Eighth-Brick converters have, as standard features,
remote ON/OFF capability, adjustable output voltage trim from
80% to 110% of nominal, over-current/under-voltage protection,
and full international safety approval including EN60950-1 VDE
and cUL60950.
Technical Reference Note -
EIGHTH-BRICK SERIES
Single Output Value Products
Rev.09.10.07
eighth-brick series
2 of 31
Stresses in excess of the maximum ratings can cause permanent damage to the device. Operation of the device is not implied at these or any other
conditions in excess of those given in the specification. Exposure to absolute maximum ratings can adversely affect device
reliability.
Absolute Maximum Ratings
Characteristic
Input voltage - continuous
Input voltage - peak/surge
Input voltage - remote pin
Operating temperature
Storage temperature
Output power (LES25A48-1V2J)
Output power (LES25A48-1V5J)
Output power (LES25A48-1V8J)
Output power (LES20A48-2V5J)
Output power (LES20A48-3V3J)
Output power (LES10A48-5V0J)
Symbol
Vin (cont)
Vin (peak)
Vrem (peak)
Top
Tstorage
Pout (max)
Pout (max)
Pout (max)
Pout (max)
Pout (max)
Pout (max)
Min
-0.3
-0.3
-0.3
-40
-55
Typ
Max
75
100
75
85
125
30
37.5
45
50
66
50
Units
V dc
V dc
V dc
˚C
˚C
W
W
W
W
W
W
Notes and Conditions
Vin(+) - Vin(-)
Transients of 100 ms or less,
in duration
Peaks of any duration
Measured at ambient
All specifications are typical at nominal input Vin = 48 V and full rated resistive load at 25 ˚C ambient unless otherwise specified.
Input Characteristics
Characteristic
Input voltage - operating
Input current - no load
Input current - Quiescent
Inrush current (i
2
t)
Inrush current ratio
Input ripple rejection
Input fuse
Symbol
Vin (oper)
lin
lin (off)
linrush
It/Im
Min
36
Typ
48
Max
75
50
6
0.01
22
50
10
Units
Vdc
mAdc
mAdc
A
2
s
dB
A
Frequency <1 kHz
Slow Blow/Antisurge HRC
recommended 200 V Rating.
See Application Note 138
Vin (min) - Vin (max), enabled
Converter disabled
Notes and Conditions
Turn On/Off
Characteristic
Input voltage - turn on
Input voltage - turn off
Turn on delay - enabled,
then power applied
Symbol
Vin (on)
Vin (off)
Tdelay
(power)
33
Min
Typ
35.5
33.5
10
15
Max
36
Units
Vdc
Vdc
ms
With the Remote ON/OFF signal
asserted, time from when Vin >
Vin (oper) until Vout is within
total regulation band
With Vin = Vin (nom), then
Remote ON/OFF asserted,
time until Vo is within total error
band
Rise time
Trise
2
3
ms
From 10% to 90%, full resistive
load, no external capacitance
Notes and Conditions
Turn on delay - power
applied, then enabled
Tdelay
(enable)
10
15
ms
Technical Reference Note -
EIGHTH-BRICK SERIES
Single Output Value Products
Rev.09.10.07
eighth-brick series
3 of 31
Signal Electrical Interface
Characteristic - Signal Name
At remote ON/OFF (control) pin
Open collector or equivalent
compatible
Control pin open circuit voltage
High level input voltage
Vih
Vih
2.4
2.8
3.5
V
V
Symbol
Min
Typ
Max
Units
Notes and Conditions
See Notes 1 and 2
Iih = 0 µA; open circuit voltage
Converter guaranteed ON
when control pin is
greater than Vih (min)
Current flowing into control pin
when pin is pulled high
(max. at Vih = 75 V)
Acceptable leakage current from
signal pin into the open collector
driver (neg = from converter)
Converter guaranteed off
when control pin is
less than Vil (max)
ViI = 0.0 V, maximum source
current from converter with
short circuit
High level input current
Iih
10
µA
Acceptable high level
leakage current
Low level input voltage
Iih (leakage)
-10
µA
ViI
-0.3
0.4
V
Low level input current
Iil (max)
-0.45
-0.5
mA
Common Protection/Control
Characteristic
Overtemperature shutdown
threshold
Symbol
Tots
Min
120
Typ
125
Max
130
Units
˚C
Notes and Conditions
Hotspot temperature,
non-latching shutdown
protection. See Application
Note 138
% of Vo (nom), compensation
includes trim.
Remote sense compensation
10
%
Reliability and Service Life
Characteristic
Mean time between failure
Symbol
MTBF
Min
Typ
4,034,120
Max
Units
Hours
Notes and Conditions
Telcordia Tech. SR-332
Tamb = 25˚C, Tcase = 20 ºC rise
airflow = 400 LFM,
V
in
= V
in
(nom),
I
out
= 50% I
out
(max)
Isolation
Characteristic
Input to output test voltage
Input to output capacitance
Input to output resistance
Input to output insulation system
10
Basic
1200
Symbol
Min
Typ
Max
2250
Units
Vdc
pF
MΩ
Measured with 500 Vdc
Notes and Conditions
Test duration 1s
Technical Reference Note -
EIGHTH-BRICK SERIES
Single Output Value Products
Rev.09.10.07
eighth-brick series
4 of 31
Other Specifications
Characteristic
Switching frequency
Symbol
fsw
Min
Typ
480
Max
Units
kHz
Notes and Conditions
Fixed frequency (all models)
Environmental Requirements
Characteristic
Thermal performance
Altitude
Symbol
Min
-40
Typ
Max
120
3000
9843
10000
32808
Units
˚C
m
ft
m
ft
Notes and Conditions
Hotspot temperature
Derate total max. output
current by 20%
Derate total max. output
current by 20%
Derate total max. output
current by 50%
Derate total max. output
current by 50%
Type
Air temperature
Parameter
Reference
IEC 60068-2-1 Ab/Ad:
Cold
IEC 680068-2-2 Bb/Bd:
Dry heat
IEC 68-2-14 Nb: Rate of
change
Test Level
-40 ˚C, 16 h
+70 ˚C, 16 h
-5 ˚C/+45 ˚C, 0.5 ˚C/min 2 cycles, 3 h ea
+35 ˚C, 93% RH, 4 days 50% of samples powered
at 10% load and 50% unpowered
3 axes, 5 sweeps per axis
unpowered on test card.
Relative humidity
IEC60068-2-56
Cb: damp heat, steady
state
IEC60068-2-6
Fc: sinusoidal
Vibration
Shock and Bump
IEC 60068-2-29 100
Eb: bump
Freq. range and displacement 5-9 Hz, 1.2 mm. Freq. range
and acceleration 9-200 Hz, 10 m/s
2
bumps each of 6 directions, mounted on powered on
test card, shock spectrum half-sine, duration
EMC Electromagnetic
Compatibility
Phenomenon
Immunit y:
ESD
Radiated field
Conducted
Input transients
Enclosure
Enclosure
DC power
DC power
EN61000-4-2
EN61000-4-3
EN61000-4-6
ETR 283
6 kV contact Level 3, (output within specification)
8 kV air
Level 3, (output within specification
10 V/m
10 V
With recommended Class B external filter, no load, 10J
(output remains within ±9%)
Level 3, (output within specification) X and Y axes
Port
Standard
Test level
Notes and conditions
Technical Reference Note -
EIGHTH-BRICK SERIES
Single Output Value Products
Rev.09.10.07
eighth-brick series
5 of 31
Standards Compliance List
Characteristic
EN60950
UL/cUL 60950
VDE
3rd edition
Safety Agency Approvals
Standard
UL/cUL 60950 File Number
VDE Certificate No.
Category
E135734/60950
10401-3336-0197
Material Ratings
Characteristic - Signal Name
Flammability rating
Material type
Notes and Conditions
UL94V-0
FR4 PCB
Model Numbers
Model
Number
LES25A48-1V2J
LES25A48-1V5J
LES25A48-1V8J
LES20A48-2V5J
LES20A48-3V3J
LES10A48-5V0J
Input
Voltage
36-75 Vdc
36-75 Vdc
36-75 Vdc
36-75 Vdc
36-75 Vdc
36-75 Vdc
Output
Voltage
1.2 V
1.5 V
1.8 V
2.5 V
3.3 V
5.0 V
Overvoltage
Protection
1.4 V
1.8 V
2.2 V
3.0 V
4.0 V
6.0 V
Output Current
(Max.)
25 A
25 A
25 A
20 A
20 A
10 A
Typical
Efficiency
88.0%
89.5%
90.5%
90.0%
91.0%
92.0%
RoHS Compliance Ordering Information
The ‘J’ at the end of the Partnumber
indicates that the Part is 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.
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