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Corporate: www.cdtechno.com
Corporate: www.cdtechno.com
Product: www.cdpowerelectronics.com
VSX40MD23
40 Watt Dual Output Quarter Brick DC/DC Converter
VSX40
VSX40-U
APPLICATIONS
Distributed Power Architectures
Workstations
EDP Equipment
Telecommunications
OPTIONS
Choice of Remote On/Off logic
Configuration
Heatsink Available for Extended
Operation
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
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
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
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.
ADDITIONAL INFORMATION
See Application Note DCAN-41
at www.cdpowerelectronics.com
ABSOLUTE MAXIMUM RATINGS
PARAMETER SYMBOL MIN MAX UNIT
Input Voltage:
VSX40MD23 Vi 100 Vd c
I/O Isolation Voltage 1500 V dc
I/P to case 1500 V dc
O/P to case 200 Vd c
Operating Case Temperature T -40 100 °C
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VSX40MD23 REV E 5/02
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SPECIFICATIONS, ALL MODELS
Specifications are at T
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
INPUT
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
3.3 Vout (V1) 3.3 Vo 3.225
Output Voltage Setpoint
(Vi=48, Io2=9A, Io3=6A, Tc=25°C)
2.5 (V2) 2.5 Vo,set 2.450 2.510 Vd c
3.3 (V1) 3.3 Vo,set 3.310 3.390 Vd c
Output Ripple and Noise Voltage
(peak-to-peak, 100 MHz BW)
2.5 (V2)
3.3 (V1)
Output Current
(Total module O/P power should
not exceed 40 Watts)
2.5 (V2) Io
3.3 (V1) Io
Output Current Limit Inception
(Vo=95% of Vo nom)
2.5 (V2) Io2cli 16.8 18.5 21.0 A
3.3 (V1) Io3cli 12.7 14.0 15.9 A
Output Short Ckt Current
(Max impedance across short circuit = 65mΩ)
2.5 Vo 15 19 22 A
3.3 Vo 11 13.2 17 A
Efficiency (Vi=48V, Io2=8A,Io3=6A, Tc=40°C) η 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
OUTPUT Under any conditions, the voltage of V1 will always be greater or equal to that of V2.
load up to Iomax or Pomax Peak Deviation
outside settling point – – 2 _ %Vo nom
= +40°C nominal input voltage unless otherwise specified.
CASE
_
_
2
3
_
_
_
_
_
_
_
_
_
_
2.555 Vdc
3.450 Vdc
60 mv p-p
80 mv p-p
16 A
12.12 A
NOTE: 1. Worst case voltage conditions occur with full load drawn from one output only, zero being drawn from the other. For worst
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case voltages at less extreme loading conditions, consult the factory.
VSX40MD23 REV E 5/02
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PARAMETER SYMBOL MIN TYP MAX UNITS
Isolation Specifications
Isolation Capacitance _ _ 1000 _ pF
Isolation Resistance
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
Turn On Time (Vo within 1% of steady state)
From Application of Vin
From Remote On/Off Activation)
Input Undervoltage Lockout
(Turn Off & Turn On Voltages Track)
Turn On
Turn Off
GENERAL
Input Overvoltage Lockout
(Turn Off & Turn On Voltages Track)
Turn Off
Turn On
Output Overvoltage Set Point
(Non-latching independent control loop)
2.5 Vo VO2OV clamp 2.7 2.9 3.2 V dc
3.3 Vo VO3OV clamp 3.6 3.9 4.2 V dc
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
3.3 Vo VO3td
Tie Trim to O/P RTN for trim up 2.5 Vo VO2td
3.3 Vo VO3td
_
Ion/off
_
_
_
_
_
_
td
2
10
_
_
30 33 36 Vd c
27 30 33 Vd c
76 80 84 Vdc
74.5 78.5 82.5 Vdc
_
_
_
_
_ _
_
_
7 10 mSecs
3 4 mSecs
-10
-10
10
10
50 Vdc
200 µ A
_
_
_
_
MΩ
%
%
%
%
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Dimensions are in inches (millimeters).
Tolerances: x.xx in. + 0.02 in.
x.xxx in.
+0.01 in.
MECHANICAL
.145
(3.68)
(3.81)
.150
1.50
(38.10)
.50
(12.70)
.150
(3.81)
1.200
(30.48)
2.30
(58.42)
0.040 (1.02) 7 PLACES
2.000
(50.80)
PIN 1
M3 THREAD
4 PLACES
.600
(15.24)
.350
(8.89)
.000
.350
(8.89)
.600
(15.24)
.750
(19.05)
Pinout Key
1+Vin
2 On/Off
3-Vin
4 +2.5 Vout
5 O/P RTN
6Trim
7 +3.3 Vout
CASE OUTLINE
7
6
5
4
2.000
(50.80)
.150
1
2
3
(3.81)
.000
RECOMMENDED PCB HOLE PATTERN
(VIEW OF PCB, THROUGH UNIT)
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.
0.144 (3.66)
4 PLACES
.375 (9.53)
.125 (3.18)
.125 (3.18)
.375 (9.53)
0.051 (1.30)
7 PLACES
ORDERING INFORMATION
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
Power Electronics Division, United States
3400 E Britannia Drive, Tucson, Arizona 85706
Tel: 800.547.2537 Fax: 520.295.4160
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.
Product: www.cdpowerelectronics.com
VSX40MD23 REV E 5/02
Tel: +44 (0)1908 615232 Fax: +44 (0)1908 617545
Model Numbers
VSX40MD23
VSX40MD23-U
VSX40MD23-1
VSX40MD23-1U
C&D Technologies, (NCL)
Milton Keynes MK14 5BU UK
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