The VSX50 Series are 50 Watt, compact,
high-efficiency, high-density dual output
converters with a 36-75V input and
2.5Vdc and 3.3Vdc outputs. The industry
quarter-pack size of 2.3" x 1.5" x 0.5"
coupled with 89% efficiency is an
industry high-density breakthrough.
These converters utilize V Series 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
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 VSX50 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 VSX50
Series.
ADDITIONAL INFORMATION
See Application Note DCAN-41
at www.cdpowerelectronics.com
ABSOLUTE MAXIMUM RATINGS
PARAMETERSYMBOLMINMAXUNIT
Input Voltage:
VSX50MD23Vi 100Vd c
I/O Isolation Voltage1500Vdc
I/P to case1500Vdc
O/P to case 200Vdc
Operating Case Temperature T-40 100°C
Product: www.cdpowerelectronics.com
VSX50MD23 REV B 5/02
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SPECIFICATIONS, ALL MODELS
Specifications are at T
PARAMETERSYMBOLMINTYPMAXUNITS
INPUT
Voltage Range364875VDC
Input Reflected Ripple CurrentPeak - Peak325mA
Maximum Input CurrentVin = 30V, Pout 50W2A
No Load Input Current60mA
On/Off Activated Input Current25mA
Input Undervoltage Lockout
Output Power50Watts
Output EfficiencyIo1=10A, Io2=7.5A88%
Set Point Voltage
V1 (2.5V)Io1=10A2.4602.52.530VDC
V2 (3.3V)Io2=7.5A3.2903.33.360VDC
Output CurrentTotal Module Output
V1 (2.5V)Power Should Not020A
V2 (3.3V)Exceed 50 Watts015A
Output Ripple And Noise Voltage100 MHz BW
V1 (2.5V)60mV
V2 (3.3V)80mV
Output Adjust RangeBoth Outputs Will Adjust-8+10%
Output Temperature Drift0.020.05% /°C
Line RegulationVIN = 36 to 750.100.20%
Load Regulation
V1 (2.5V)I1= 0 to 20A, I2=0A4% of Nom
V2 (3.3V)I1=0A, I2=0 to 15.15A2.5% of Nom
Load Cross Regulation
V1 (2.5V)I1= 0A, I2=0 to 15.15A1.5% of Nom
V2 (3.3V)I1=0 to 20A, I2=0A3.5% of Nom
Output Current Limit Inception
V1 (2.5V)21.024.028.0A
V2 (3.3V)16.017.522.0A
Short Circuit Current
V1 (2.5V)19.023.028.0A
V2 (3.3V)14.018.022.0A
Output Overvoltage Set Point
(Non-latching independent
control loop)
V1 (2.5V)2.702.903.25VDC
V2 (3.3V)3.603.904.30VDC
Transient Response(∆Ιο/∆t=0.2A/µsec either
Settling Timeoutput) Load change of 40%100µsec
OUTPUT Under any conditions, the voltage of V1 will always be greater or equal to that of V2.
Peak Deviationof Ιο max at any operating4%
Switching Frequency330KHz
= +40°C nominal input voltage unless otherwise specified.
CASE
at the Same Time and
by the Same %
I1=10A, I2=7.5A
load up to Ιο max and Pο max
P-P
P-P
Product: www.cdpowerelectronics.com
VSX50MD23 REV B 5/02
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PARAMETER SYMBOLMINTYPMAXUNITS
ISOLATION SPECIFICATIONS
Input to Output1500V
Input to Case1500VDC
Output to Case200VDC
Resistance Input to Output10MΩ
Capacitance Input to Output1000pF
Leakage CurrentV
FEATURE SPECIFICATIONS
Remote On/Off
(open collector equivalent,
signal referenced to –V
terminal)
IN
VSX50MD23 Preferred Logic (negative)
Logic Low – Module On
Logic High – Module Off
VSX50MD23-1 Optional Logic (Positive)
Logic Low – Module Off
Logic High – Module On
GENERAL
Turn On Time
From Application of V
From Remote On/Off Activationsteady state)34mSecs
Weight
Operation /SpecificationCase-40+100° C
StorageCase-55+125° C
ShutdownCase+105+115+125° C
Shutdown (Hysteresis)10° C
Thermal ImpedanceFree Air12.2° C/Watt
(Case to Ambient)
IN
= 240VAC, 60Hz90µA, rms
ISO
Von/off Low00.4VDC
Von/off High2Open CollectorVDC
Ιon/off200µ A
(VO within 1% of710mSecs
DC
Product: www.cdpowerelectronics.com
VSX50MD23 REV B 5/02
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GRAPHS
EFFICIENCY VS. OUTPUT LOADLOAD REGULATION VS. LOAD DISTRIBUTION
EFFICIENCY VS. INPUT VOLTAGE
OUTPUT VOLTAGE RIPPLE VS.
TEMPERATURE AT FULL LOAD
EFFICIENCY VS. BASEPLATE TEMPERATURE
FULL LOAD EFFICIENCY VS. LOAD DISTRIBUTION
REFLECTED RIPPLE VS. INPUT VOLTAGE
Product: www.cdpowerelectronics.com
OUTPUT RIPPLE VS. LOAD
VSX50MD23 REV B 5/02
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Dimensions are in inches (millimeters).
Tolerances: x.xx in. + 0.02 in.
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
VSX50MD23 - 1 U
Device Family
VSX50MD23 (Quarter Brick, 50 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
VSX50MD23 REV B 5/02
Tel: +44 (0)1908 615232 Fax: +44 (0)1908 617545
Model Numbers
VSX50MD23
VSX50MD23-U
VSX50MD23-1
VSX50MD23-1U
C&D Technologies, (NCL)
Milton Keynes MK14 5BU UK
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