1
VSX40MD23 REV E 5/02
Product: www.cdpowerelectronics.com
VSX40
VSX40-U
40 Watt Dual Output Quarter Brick DC/DC Converter
Corporate: www.cdtechno.com
Corporate: www.cdtechno.com
Product: www.cdpowerelectronics.com
VSX40MD23
APPLICATIONS
Distributed Power Architectures
Workstations
EDP Equipment
Telecommunications
OPTIONS
Choice of Remote On/Off logic
Configuration
Heatsink Available for Extended
Operation
ADDITIONAL INFORMATION
See Application Note DCAN-41
at www.cdpowerelectronics.com
2.5V & 3.3V Dual Output
2.3
"
x 1.5
"
x 0.5
"
89% Efficiency
Low Output Noise
Input Filtering
Remote On/Off, Input Side
Output Voltage Trim, +/-10%
Fixed Frequency Operation
-40C° to +100C° Baseplate Temp.
Output Current Limit, Self-Start
1,500 Vdc Isolation, Input to Output
UL/CUL 1950, EN60 950
36 to 75 Vdc Input Models
Continuous Short Circuit
Protection
Non-latching Protection:
Input Undervoltage
Input Overvoltage
Output Overvoltage
Overtemperature
Output Voltage Tracking at
Turn-on and Turn-off
No Minimum Load Current
The VSX40 Series are dual output
converters with a 36-75V input. The
industry quarter-pak size of 2.3" x 1.5"
x 0.5" coupled with 89% efficiency is an
industry high-density breakthrough.
These converters utilize Vx high density
technology. This technology has been
featured in our highly efficient VKP and
VKA series now successfully in use
worldwide. The very high 89%
efficiency minimizes the requirement for
ABSOLUTE MAXIMUM RATINGS
PARAMETER
SYMBOL
MIN
MAX
UNIT
Input Voltage:
VSX40MD23
Vi
100
Vdc
I/O Isolation Voltage
1500
Vdc
I/P to case
1500
Vdc
O/P to case
200
Vdc
Operating Case Temperature
T
-40
100
°C
heat-sinking and the low output ripple
minimizes the need for additional
filtering. For maximum flexibility,
power can be traded between outputs as
required. The VSX40 series feature
virtually all of the options required by
design engineers but not at the
competition's typical additional price
for each option. This multitude of
features are standard on the VSX40
series.
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VSX40MD23 REV E 5/02
Product: www.cdpowerelectronics.com
INPUT
SPECIFICATIONS, ALL MODELS
Specifications are at T
CASE
= +40°C nominal input voltage unless otherwise specified.
PARAMETER
SYMBOL
MIN
TYP
MAX
UNITS
Operating Input Voltage
VSX40MD23
Vi
36
48
75
VDC
Maximum Input Current
(Vi=0V to Vi max, Io=Io max)
VSX40MD23
Ii max
1.5
A
I/P Reflected Ripple Current
260
mA p-p
No Load Input Current
IiNL
35
mA
On/Off Activated Input Current
IiQ
20
mA
PARAMETER
SYMBOL
MIN
TYP
MAX
UNITS
Output voltage (Note 1)
Over all conditions of I/P voltage,
load and temperature)
2.5 Vout (V2)
2.5 Vo
2.375
_
2.555
Vdc
3.3 Vout (V1)
3.3 Vo
3.225
_
3.450
Vdc
Output Voltage Setpoint
(Vi=48, Io
2
=9A, Io
3
=6A, Tc=25°C)
2.5 (V2)
2.5 Vo,set
2.450
2.510
Vdc
3.3 (V1)
3.3 Vo,set
3.310
3.390
Vdc
Output Ripple and Noise Voltage
(peak-to-peak, 100 MHz BW)
2.5 (V2)
_
_
_
60
mv p-p
3.3 (V1)
_
_
_
80
mv p-p
Output Current
(Total module O/P power should
not exceed 40 Watts)
2.5 (V2)
Io
2
_
_
16
A
3.3 (V1)
Io
3
_
_
12.12
A
Output Current Limit Inception
(Vo=95% of Vo nom)
2.5 (V2)
Io
2
cli
16.8
18.5
21.0
A
3.3 (V1)
Io
3
cli
12.7
14.0
15.9
A
Output Short Ckt Current
(Max impedance across short circuit = 65m
)
2.5 Vo
15
19
22
A
3.3 Vo
11
13.2
17
A
Efficiency (Vi=48V, Io
2
=8A,Io
3
=6A, Tc=40°C)
88
89
_
%
Dynamic Response
(
Io/t=0.2A/µsec.Vi=48V, Tc=25°C, either O/P)
Load change of 50% Io max; at any operating
load up to Iomax or Pomax Peak Deviation
outside settling point
2
_
%Vo nom
NOTE: 1. Worst case voltage conditions occur with full load drawn from one output only, zero being drawn from the other. For worst
case voltages at less extreme loading conditions, consult the factory.
OUTPUT
Under any conditions, the voltage of V1 will always be greater or equal to that of V2.
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VSX40MD23 REV E 5/02
Product: www.cdpowerelectronics.com
GENERAL
PARAMETER
SYMBOL
MIN
TYP
MAX
UNITS
Isolation Specifications
Isolation Capacitance
_
_
1000
_
pF
Isolation Resistance
_
10
_
_
M
Feature Specifications
Remote On/Off (open collector equivalent,
signal referenced to -Vin terminal)
VSx40MD23 Preferred Logic (negative)
Logic Low - Module On
Logic High - Module Off
VSX40MD23-1 - Optional Logic (positive)
Logic Low - Module Off
Logic High - Module On
Logic Low: At Von/off = 0V
Von/off
0
_
50
Vdc
Ion/off
_
200
µA
Turn On Time (Vo within 1% of steady state)
From Application of Vin
_
_
7
10
mSecs
From Remote On/Off Activation)
_
_
3
4
mSecs
Input Undervoltage Lockout
(Turn Off & Turn On Voltages Track)
Turn On
_
30
33
36
Vdc
Turn Off
_
27
30
33
Vdc
Input Overvoltage Lockout
(Turn Off & Turn On Voltages Track)
Turn Off
_
76
80
84
Vdc
Turn On
_
74.5
78.5
82.5
Vdc
Output Overvoltage Set Point
(Non-latching independent control loop)
2.5 Vo
VO2OV clamp
2.7
2.9
3.2
Vdc
3.3 Vo
VO3OV clamp
3.6
3.9
4.2
Vdc
Overtemperature Shutdown
Tc
105
115
125
°C
Hysteresis
10
°C
Weight
VSX40MD23, VSX40MD23-1
67
Grams
VSX40MD23-U, VSX40MD23-1U
Output Trim
Tie Trim to +2.5 Vo for trim down 2.5 Vo
VO
2
td
_
-10
_
%
3.3 Vo
VO
3
td
_
-10
_
%
Tie Trim to O/P RTN for trim up 2.5 Vo
VO
2
td
_
10
_
%
3.3 Vo
VO
3
td
_
10
_
%
4
VSX40MD23 REV E 5/02
Product: www.cdpowerelectronics.com
To Find Model Number
VSX40MD23 - 1 U
Device Family
VSX40MD23 (Quarter Brick, 40 Watt DC/DC)
Logic: No Number = Preferred Logic (Negative);
1 = Optional Logic (Positive)
Package
No Letter = Encapsulated; U = Unencapsulated
Model Numbers
VSX40MD23
VSX40MD23-U
VSX40MD23-1
VSX40MD23-1U
ORDERING INFORMATION
MECHANICAL
Dimensions are in inches (millimeters).
Tolerances: x.xx in. + 0.02 in.
x.xxx in. +0.01 in.
Pinout Key
1
+Vin
2
On/Off
3
-Vin
4
+2.5 Vout
5
O/P RTN
6
Trim
7
+3.3 Vout
.125 (3.18)
.125 (3.18)
.375 (9.53)
.000
.150
(3.81)
.000
.750
(19.05)
1
2
3
7
6
5
4
2.30
(58.42)
1.50
(38.10)
.50
(12.70)
.145
(3.68)
.150
(3.81)
2.000
(50.80)
1.200
(30.48)
.150
(3.81)
PIN 1
M3 THREAD
4 PLACES
0.051 (1.30)
7 PLACES
0.144 (3.66)
4 PLACES
RECOMMENDED PCB HOLE PATTERN
(VIEW OF PCB, THROUGH UNIT)
.600
(15.24)
.600
(15.24)
.350
(8.89)
0.040 (1.02) 7 PLACES
2.000
(50.80)
NOTES:
1. Marked with: specific model ordered, date
code, job code.
2. MATERIAL: Units are encapsulated in a low
thermal resistance molding compound which has
excellent chemical resistance and electrical
properties in high humidity environments and
over a wide operating temperature range. The
encapsulant and outer shell of the unit have
UL94V-0 ratings. Lead material is solder plated
to allow ease of solderability.
3. IMPORTANT: When utilizing the PEM nuts for
board mounting, it is required to follow guidelines
in application note DCAN-41 available on the
web at www.cdpowerelectronics.com.
CASE OUTLINE
.375 (9.53)
.350
(8.89)
Any data, prices, descriptions or specifications presented herein are subject to revision by C&D Technologies, Inc. without notice. While such information is believed to
be accurate as indicated herein, C&D Technologies, Inc. makes no warranty and hereby disclaims all warranties, express or implied, with regard to the accuracy or
completeness of such information. Further, because the product(s) featured herein may be used under conditions beyond its control, C&D Technologies, Inc. hereby
disclaims all warranties, either express or implied, concerning the fitness or suitability of such product(s) for any particular use or in any specific application or arising
from any course of dealing or usage of trade. The user is solely responsible for determining the suitability of the product(s) featured herein for user's intended purpose
and in user's specific application. C&D Technologies, Inc. does not warrant or recommend that any of its products be used in any life support or aviation or aerospace
applications.
Power Electronics Division, United States
3400 E Britannia Drive, Tucson, Arizona 85706
Tel: 800.547.2537 Fax: 520.295.4160
C&D Technologies, (NCL)
Milton Keynes MK14 5BU UK
Tel: +44 (0)1908 615232 Fax: +44 (0)1908 617545
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