Quarter-Brick Dual Series | 40A DC/DC
High Efficiency, High Current, Low Profile
DC/DC Converters
QUARTER-BRICK SERIES
Dual Output Performance Products
Two independent outputs
High full load efficiency
Low profile through hole version
Wide ambient temperature range, -40˚C to +85˚C
90% to 110% output trim
Basic Insulation system
Overvoltage and overtemperature protection
Remote ON/OFF
Approvals to EN60950-1 (VDE) and UL60950 (UL/cUL)
100V, 100mSec input voltage transient rated
Up to 100% load imbalance
Starts into pre-biased outputs
Tracking monotonic startup
Secondary side control, no optocouplers, fast transient load response
The Quarter-Brick series is a new high
efficiency, open-frame, isolated, non-
parallelable, dual-output converter product
in an industry standard quarter-brick
footprint and operating 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 the
highest full load efficiency in the industry
for outputs below 2.5V. The Quarter-Brick
series has, as standard features, remote
ON/OFF capability, adjustable output
voltage trim from 90 to 110% of nominal,
over-current/under-voltage protection, and
full international safety approval including
EN60950-1 VDE and UL60950 UL/cUL.
Patent No. 6,765,810
Other Patents Pending
[ 2 YEAR WARRANTY ]
1
File Name: lf_quarter_brick_d_perform.pdf Rev: 18 July 2005
SXA10
| 40A
60W DC/DC
Quarter-Brick Dual Series
Series |
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
Symbol
Vin (cont)
Vin (peak)
Vrem (peak)
Top
Min
-0.3
-0.3
-0.3
-40
Typ
Max
75
100
75
85
Units
V DC
V DC
V DC
˚C
Notes and Conditions
Vin(+) - Vin(-)
Transients 100mSec or
less in duration
Peaks of any duration
Measured at ambient.
See Application Note 137
for details
Storage temperature
Maximum Rated Output Power
LQD40A48-3V3-1V2
LQD40A48-3V3-1V5
LQD40A48-3V3-1V8
LQD40A48-3V3-2V5
Tstorage
Pout
Pout
Pout
Pout
(max)
(max)
(max)
(max)
-55
125
˚C
90
96
102
116
W
W
W
W
All specifications are typical at nominal input Vin = 48V, with full rated resistive load on both outputs at 25˚C ambient unless otherwise stated.
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)
Inrush
It/Im
Min
36
Typ
48
50
3
0.05
22
50
10
dB
A
Max
75
70
6
Units
V DC
mADC
mADC
A
2
s
Vin (min) - Vin (max), enabled
Converter disabled
See Application Note 137 for
inrush test circuit
Frequency <1 kHz
Slow blow/antisurge HRC
recommended 200V Rating
See Application Note 137
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
14
Max
36
35
20
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 within total error
band
From 10% to 90%, full resistive
load, no external capacitance
Notes and Conditions
Turn on delay - power
applied, then enabled
Tdelay
(enable)
14
20
msec
Rise time
Trise
4
6
msec
2
File Name: lf_quarter_brick_d_perform.pdf Rev: 18 July 2005
Quarter-Brick Dual Series | 40A 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
See Application Note 137 for
remote ON/OFF details
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
< 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
0.4
V
Low level input current
Iil (max)
-0.4
-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 137
Reliability and Service Life
Characteristic
Mean time between failure
Symbol
MTBF
Min
Typ
2,883,816
Max
Units
Hours
Notes and Conditions
Telcordia Tech. SR-332
Tamb = 25ºC, Tcase = 20ºC rise
airflow = 400LFM,
V
in
= V
in
(nom),
I
out 1,2
= 50% I
out 1,2
(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
V DC
pF
MΩ
Measured with 500 VDC
Notes and Conditions
Test duration 1s
3
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File Name: lf_quarter_brick_d_perform.pdf Rev: 18 July 2005
SXA10
| 40A
60W DC/DC
Quarter-Brick Dual Series
Series |
DC/DC
High Efficiency, High Current, Low Profile
DC/DC Converters
Other Specifications
Characteristic
Switching frequency
Weight
Symbol
Fsw
Min
Typ
480
34
Max
Units
kHz
g
Notes and Conditions
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
Relative humidity
IEC60068-2-56
Cb: damp heat, steady
state
IEC60068-2-6
Fc: sinusoidal
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
+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 test card and
powered on. Shock spectrum half-sine, duration 11ms,
acceleratoin: 50m/sec
2
Vibration
Shock and Bump
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
100V, 100mS
6kV contact
8kV air
10V/m
10V
Level 3, (output within specification)
Level 3, (output within specification)
Level 3, (output within specification) X and Y axes
Level 3, (output within specification)
With recommended Class B external filter, no load, 10J
(output remains within ±9%)
Port
Standard
Test level
Notes and conditions
4
File Name: lf_quarter_brick_d_perform.pdf Rev: 18 July 2005
Quarter-Brick Dual Series | 40A DC/DC
High Efficiency, High Current, Low Profile
DC/DC Converters
Standards Compliance List
Characteristic
EN60950-1
UL/cUL 60950
3rd edition
Safety Agency Approvals
Standard
UL/cUL60950 File Number
VDE Certificate No.
Category
E135734
10401-3336-0197
Material Ratings
Characteristic
Flammability rating
Material type
Notes and Conditions
UL94V-0
FR4 PCB
Model Numbers
Model
Number
LQD40A48-3V3-1V2
LQD40A48-3V3-1V5
LQD40A48-3V3-1V8
LQD40A48-3V3-2V5
Input
Voltage
36-75 VDC
36-75 VDC
36-75 VDC
36-75 VDC
Output
Voltage
3.3V/1.2V
3.3V/1.5V
3.3V/1.8V
3.3V/2.5V
Overvoltage
Protection
4V/1.5V
4V/1.8V
4V/2.0V
4V/3.0V
Output Current
(Max.)
20A/20A
20A/20A
20A/20A
20A/20A
Typical
Efficiency
90.0%
90.5%
90.5%
90.5%
5
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File Name: lf_quarter_brick_d_perform.pdf Rev: 18 July 2005
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