Eighth-Brick Series | 25A DC/DC
High Efficiency, High Current, Low Profile DC/DC Converters
EIGHTH-BRICK SERIES
Single Output Value Products
High efficiency topology and high output current
Low profile, 0.300in (7.62mm) 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 temperature range, -40°C to +85°C
80% to 110% output trim
Basic insulation
Overvoltage and overtemperature protection
Remote ON/OFF
Approvals to EN60950-1 VDE and UL/cUL60950
100V, 100mSec input voltage transients rated
Monotonic startup into normal and prebiased loads
Secondary side control, no optocouplers, fast transient response
The Eighth-Brick Value series is a new low
cost, high efficiency, open frame, isolated,
up to 25A converter in an industry
standard eighth-brick footprint and
operates from a 36 to 75VDC 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.
Patent No. 6,765,810
Other Patents Pending
[ 2 YEAR WARRANTY ]
1
File Name: lf_eighth_brick_value.pdf Rev (03): 13 May 2004
SXA10
Eighth-Brick Series
Series
25A DC/DC
|
| 10W DC/DC
High Efficiency, High Current, Low Profile DC/DC Converters
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 (LES25A48-1V2)
Output power (LES25A48-1V5)
Output power (LES25A48-1V8)
Output power (LES20A48-2V5)
Output power (LES20A48-3V3)
Output power (LES10A48-5V0)
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 100mSec or less,
in duration
Peaks of any duration
Measured at ambient
All specifications are typical at nominal input Vin = 48V 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
V DC
mADC
mADC
A
2
s
dB
A
Frequency <1 kHz
Slow Blow/Antisurge HRC
recommended 200V 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
V DC
V DC
msec
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
2
3
msec
From 10% to 90%, full resistive
load, no external capacitance
Notes and Conditions
Turn on delay - power
applied, then enabled
Tdelay
(enable)
10
15
msec
Rise time
Trise
2
File Name: lf_eighth_brick_value.pdf Rev (03): 13 May 2004
Eighth-Brick Series | 25A DC/DC
High Efficiency, High Current, Low Profile DC/DC Converters
Signal Electrical Interface
Characteristic - Signal Name Symbol
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
Min
Typ
Max
Units
Notes and Conditions
See Notes 1 and 2
Iih = 0µA; 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 = 75V)
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 = 25ºC, Tcase = 20ºC rise
airflow = 400LFM,
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 500VDC
Notes and Conditions
Test duration 1s
3
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File Name: lf_eighth_brick_value.pdf Rev (03): 13 May 2004
SXA10
Eighth-Brick Series
Series
25A DC/DC
|
| 10W DC/DC
High Efficiency, High Current, Low Profile DC/DC Converters
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
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
IEC60068-2-56
Cb: damp heat, steady
state
IEC60068-2-6
Fc: sinusoidal
Shock and Bump
IEC 60068-2-29
Eb: bump
Test Level
-40˚C, 16h
Units
˚C
m
ft
m
ft
Notes and Conditions
Hotspot temperature
Derate total max.
current by 20%
Derate total max.
current by 20%
Derate total max.
current by 50%
Derate total max.
current by 50%
output
output
output
output
+70˚C, 16h
-5˚C/+45˚C, 0.5ºC/min 2 cycles, 3h ea
Relative humidity
+35ºC, 93% RH, 4 days 50% of samples powered
at 10% load and 50% unpowered
3 axes, 5 sweeps per axis unpowered on test card.
Freq. range and displacement 5-9Hz, 1.2mm. Freq. range
and acceleration 9-200Hz, 10m/s
2
100 bumps each of 6 directions, mounted on powered on
test card, shock spectrum half-sine, duration
Vibration
EMC
Electromagnetic Compatibility
Phenomenon
Immunity:
ESD
Radiated field
Conducted
Input transients
Enclosure
Enclosure
DC power
DC power
EN61000-4-2
EN61000-4-3
EN61000-4-6
ETR 283
6kV contact
8kV air
10V/m
10V
With recommended Class B external filter, no load, 10J
(output remains within ±9%)
Level 3, (output within specification)
Level 3, (output within specification
Level 3, (output within specification) X and Y axes
Port
Standard
Test level
Notes and conditions
4
File Name: lf_eighth_brick_value.pdf Rev (03): 13 May 2004
Eighth-Brick Series | 25A DC/DC
High Efficiency, High Current, Low Profile DC/DC Converters
Standards Compliance List
Characteristic
EN60950-1
UL/cUL60950
VDE
3rd edition
Safety Agency Approvals
Standard
UL/cUL60950 File Number
VDE Certificate No.
Category
E135734
10401-3336-0197
Material Ratings
Characteristic - Signal Name Notes and Conditions
Flammability rating
Material type
UL94V-0
FR4 PCB
Model Numbers
Model
Number
LES25A48-1V2
LES25A48-1V5
LES25A48-1V8
LES20A48-2V5
LES20A48-3V3
LES10A48-5V0
Input
Voltage
36-75VDC
36-75VDC
36-75VDC
36-75VDC
36-75VDC
36-75VDC
Output
Voltage
1.2V
1.5V
1.8V
2.5V
3.3V
5.0V
Overvoltage
Protection
1.4V
1.8V
2.2V
3.0V
4.0V
6.0V
Output Current
(Max.)
25A
25A
25A
20A
20A
10A
Typical
Efficiency
88.0%
89.5%
90.5%
90.0%
91.0%
92.0%
5
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File Name: lf_eighth_brick_value.pdf Rev (03): 13 May 2004
