1
VSX75MD35 REV B 5/02
Product: www.cdpowerelectronics.com
75 Watt Dual Output Quarter Brick DC/DC Converter
Corporate: www.cdtechno.com
Corporate: www.cdtechno.com
Product: www.cdpowerelectronics.com
VSX75MD35
The VSX75 Series are 75 Watt, compact,
high-efficiency, high-density dual
output converters with a 36-75V input
and with 3.3Vdc and 5.0Vdc outputs.
The industry quarter-pack size of
2.3" x 1.5" x 0.5" coupled with 90%
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 90%
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 VSX75 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 VSX75
Series.
VSX75
VSX75-U
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-40
at www.cdpowerelectronics.com
3.3V & 5.0V Dual Output
2.3" x 1.5" x 0.5"
90% 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
36-75 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
PARAMETER
SYMBOL
MIN
MAX
UNIT
Input Voltage:
VSX75MD35
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
ABSOLUTE MAXIMUM RATINGS
2
VSX75MD35 REV B 5/02
Product: www.cdpowerelectronics.com
SPECIFICATIONS, ALL MODELS
Specifications are at T
CASE
= +40C nominal input voltage unless otherwise specified.
INPUT
PARAMETER
SYMBOL
MIN
TYP
MAX
UNITS
INPUT
Voltage Range
36
48
75
VDC
Input Reflected Ripple Current
Peak - Peak
500
mA
Maximum Input Current
Vin = 30V, Pout 75W
3
A
No Load Input Current
60
mA
On/Off Activated Input Current
25
mA
Input Undervoltage Lockout
Turn On
30
33
36
VDC
Turn Off
27
30
33
VDC
Input Overvoltage Lockout
Turn Off
76
80
84
VDC
Turn On
74.5
78.5
82.5
VDC
PARAMETER CONDITIONS
MIN
TYP
MAX
UNITS
Output Power
75
Watts
Output Efficiency
Io1=11.5A, Io2=7.5A
89
%
Set Point Voltage
V1 (3.3V)
Io1=11.5A
3.26
3.30
3.34
V
DC
V2 (5.0V)
Io2=7.5A
4.96
5.02
5.08
V
DC
Output Current
Total Module Output
V1 (3.3V)
Power Should Not
0
23
A
V2 (5.0V)
Exceed 75 Watts
0
15
A
Output Ripple And Noise Voltage
100 MHz BW
V1 (3.3V)
60
mV
P-P
V2 (5.30V)
80
mV
P-P
Output Adjust Range
Both Outputs Will Adjust
-8
+10
%
at the Same Time and
by the Same %
Output Temperature Drift
.
0.02
0.05
% /C
Line Regulation
V
IN
= 36 to 75
0.10
0.20
%
I
1
=11.5A, I
2
=7.5A
Load Regulation
V1 (3.3V)
I
1
= 0 to 23A, I
2
=0A
3.0
% of Nom
V2 (5.0V)
I
1
=0A, I
2
=0 to 15A
2.5
% of Nom
Load Cross Regulation
V1 (3.3V)
I
1
= 0A, I
2
=0 to 15A
1.0
% of Nom
V2 (5.0V)
I
1
=0 to 23A, I
2
=0A
5.0
% of Nom
Output Current Limit Inception
V1 (3.3V)
24
27
30
A
V2 (5.0V)
16
18
20
A
Short Circuit Current
V1 (3.0V)
22
25
30
A
V2 (5.0V)
15
18
20
A
Output Overvoltage Set Point
(Non-latching independent
control loop)
V1 (3.3V)
3.8
4.0
4.3
V
DC
V2 (5.0V)
5.85
6.1
6.35
V
DC
Transient Response
(
/t=0.2A/sec either
Settling Time
output) Load change of 40%
100
sec
Peak Deviation
of
max at any operating
4
%
load up to
max and P max
Switching Frequency
330
KHz
OUTPUT
Under any conditions, the voltage of V1 will always be greater or equal to that of V2.
3
VSX75MD35 REV B 5/02
Product: www.cdpowerelectronics.com
GENERAL
PARAMETER SYMBOL
MIN
TYP
MAX
UNITS
ISOLATION SPECIFICATIONS
Input to Output
1500
V
DC
Input to Case
1500
V
DC
Output to Case
200
V
DC
Resistance Input to Output
10
M
Capacitance Input to Output
1000
pF
Leakage Current
V
ISO
= 240V
AC
, 60Hz
90
A, rms
FEATURE SPECIFICATIONS
Remote On/Off
(open collector equivalent,
signal referenced to V
IN
terminal)
VSX75MD35 Preferred Logic (negative)
Logic Low Module On
Logic High Module Off
VSX75MD35-1 Optional Logic (Positive)
Logic Low Module Off
Logic High Module On
Von/off Low
0
0.4
V
DC
Von/off High
2
Open Collector
V
DC
on/off
200
A
Turn On Time
From Application of V
IN
(V
O
within 1% of
7
10
mSecs
From Remote On/Off Activation
steady state)
3
4
mSecs
Weight
VSX75MD35, VSX75MD35-1
67
Grams
VSX75MD35-U, VSX75MD35-1U
44
Grams
TEMPERATURE
Operation /Specification
Case
-40
+100
C
Storage
Case
-55
+125
C
Shutdown
Case
+105
+115
+125
C
Shutdown (Hysteresis)
10
C
Thermal Impedance
Free Air
12.2
C/Watt
(Case to Ambient)
4
VSX75MD35 REV B 5/02
Product: www.cdpowerelectronics.com
EFFICIENCY VS. OUTPUT LOAD
LOAD REGULATION VS. LOAD DISTRIBUTION
EFFICIENCY VS. INPUT VOLTAGE
EFFICIENCY VS. BASEPLATE TEMPERATURE
OUTPUT VOLTAGE RIPPLE VS.
TEMPERATURE AT FULL LOAD
FULL LOAD EFFICIENCY VS. LOAD DISTRIBUTION
REFLECTED RIPPLE VS. INPUT VOLTAGE
OUTPUT RIPPLE VS. LOAD
GRAPHS
5
VSX75MD35 REV B 5/02
Product: www.cdpowerelectronics.com
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
+3.3 Vout
5
O/P RTN
6
Trim
7
+5.0 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-40 available on the
web at www.cdpowerelectronics.com.
CASE OUTLINE
.375 (9.53)
.350
(8.89)
To Find Model Number
VSX75MD35 - 1 U
Device Family
VSX75MD35 (Quarter Brick, 75 Watt DC/DC)
Logic: No Number = Preferred Logic (Negative);
1 = Optional Logic (Positive)
Package
No Letter = Encapsulated; U = Unencapsulated
ORDERING INFORMATION
Model Numbers
VSX75MD35
VSX75MD35-U
VSX75MD35-1
VSX75MD35-1U
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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