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VKA50xS
50 Watt Single Output Half Brick DC/DC Converter
18-36 V & 33 - 75V Input Range High Efficiency: 87% Typical at 5V 100S Transient Response 50100% Load Step 420 kHz Fixed-Frequency Operation Remote Sense Operation to +100C Baseplate Temperature Primary Remote On/Off, Choice of Pos/Neg Logic Adjustable Output Voltage Continuout Short-Circuit Protection Thermal Shutdown Case Ground Pin
The VKA50xS Series DC/DC converters present an economical and practical solution for distributed power system architectures which require high power density and efficiency while maintaining system modularity and upgradeability. With the ability to operate over a wide input voltage range of 18 to 36 and 33 to 75 volts, these modules are
ideal for use in battery backup applications common in todays' telecommunication and electronic data processing applications. The output is fully isolated from the input, allowing for a variety of polarity and grounding configurations. The VKA50xS's proprietary control circuitry responds to 50-100%
load steps in 100Seconds to within 1% nominal Vout. The patented fixed frequency architecture combined with surface mount technology results in a compact, efficient and reliable solution to DC/DC conversion requirements. Safety per UL1950, EN 60950 and CSA 22.2 #234
PRODUCT SELECTION CHART
MODEL VKA50LS03 VKA50LS05 VKA50LS12 VKA50LS15 VKA50LS24 VKA50MS03 VKA50MS05 VKA50MS12 VKA50MS15 VKA50MS24 INPUT VOLTAGE 24VDC (18-36) VOUT (VDC) 3.3V 5.0V 12.0V 15.0V 24.0V 3.3V 5.0V 12.0V 15.0V 24.0V IOUT (A) 10.0 10.0 4.2 3.3 2.1 10.0 10.0 4.2 3.3 2.1 EFFICIENCY MIN 80 85 87 88 89 81 86 88 89 89 TYP 81 86 88 89 90 82 87 89 90 90
48VDC (33-75)
SPECIFICATIONS, ALL MODELS
Specifications are at TCASE = +40C nominal input voltage unless otherwise specified.
PARAMETER CONDITIONS MIN TYP MAX UNITS
INPUT Voltage Range VKA50LS VKA50MS Maximum Input Current VKA50LS VIN = 16VDC VKA50MS VIN = 27VDC Reflected Ripple Current Peak - Peak Input Ripple Rejection DC to 1KHz No Load Input Current LS/MS Power Dissipation LS/MS No Load Standby, Primary On/Off Disabled LS/MS Inrush Charge VIN = VINmax. VKA50LS VKA50MS Quiescent Operating Current Primary On/Off Disabled
18 33
24 48
36 75 3.7 2.2
VDC VDC A A mA dB mA W W
INPUT
50
20 60 50/100 3.6/4.8 0.18/0.4 0.520 0.360 8 12
mC mC mA
PARAMETER
OUTPUT Rated Power Set point Accuracy Line Regulation Load Regulation Output Temperature Drift Output Ripple, p-p Output Current Limit Inception Output Short-Circuit Current (2) Output Overvoltage Limit Transient Response Peak Deviation Settling Time
CONDITIONS
MIN
0
TYP
MAX
50 1 0.05 0.05
UNITS
W % % % %/C VOUT, Nom lOUT, Nom lOUT, Nom V VOUT, Nom Sec
OUTPUT
High Line to Low Line No Load to Rated Load DC to 20MHz BW test
0.02 0.02 .02 1%
125% 50 to 100% Load Step di/dt = 1.0A/Sec VOUT, 1% of Nominal Output 2% 100
130% 110% 130%
PARAMETER
ISOLATION Input to Output Input to Baseplate Output to Baseplate Resistance Capacitance Leakage Current GENERAL Efficiency, Line, Load, Temp. (3) Switching Frequency Remote Sense Compensation Output Voltage Adjust Range Remote On/Off Control Inputs Primary Sink Current-Logic Low Vlow Vhigh Turn-on Time Weight TEMPERATURE Operation/Specification Storage Shutdown Temperature Thermal Impedance, case-ambient Lead Solder Temperature NOTES: (1) (2) (3) (4) (5)
CONDITIONS
Peak Test for 2 Seconds
MIN
1500 1500 500 10
TYP
MAX
UNITS
VDC VDC VDC M pF A, rms
VISO = 240VAC, 60Hz
2000 180
GENERAL
400 12V & higher(4) Open Collector/Drain
420 -50% / +25%
440 0.5
KHz V VOUT, Nom
Within 1% of Rated Output
10.0
1.0 0.4 Open Collector 12.5 85 (3.0) +100 +125 +115 +300
mA V mSec g (oz.) C C C C/W C
Case Temperature Case Temperature Case Temperature 10 Seconds max
-40 -55 +100
+25 +25 7.1
See Typical Performance Curves, page 3 Continuous Mode See graphs for Efficiency vs. Output Load, VIN, TCASE 3.3V Models Limited in Trim Down Range Consult Factory for Details
VKA50xS Rev C 3/2001
Product: www.cdpowerelectronics.com
2
TCASE = +40C nominal input voltage unless otherwise specified.
TYPICAL PERFORMANCE CURVES
VKA50 Device Family Indicates 50 Watt Regulated Unit Model Number Selected from Table of Electrical Characteristics Where: x = Input Voltage (L = 24VDC; M = 48VDC) zz = Output Voltage (03=3.3V, 05=5V, etc.) Lead Length 0.200" - No Number 0.145" - (6) 0.110" - (8) Remote On-Off Logic: Positive - No Number Negative - (1)
VKA50xS Rev C
xSzz -
Product: www.cdpowerelectronics.com
ORDERING INFORMATION
3/2001
3
MECHANICAL
NOTES: All dimensions are in inches (millimeters).
0.530 MAX [13.46] 0.20 [5.1]
PIN PLACEMENT TOLERANCE: 0.005" MECHANICAL TOLERANCE: 0.015" Marked with: specific modeL ordered, date code, job code.
.040 [1.02] DIA. 7 PLACES .081 [2.06] DIA. 2 PLACES
0.20 [5.1] 0.50 [12.7]
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.
0.40 [10.16]
.400 [10.16]
2.000 [50.80] 1.000 [25.40] 2.40 [61.0] MAX
VKA50xS
0.700 [17.78]
1.000 [25.40] 1.400 [35.56]
1.400 [35.56]
0.19 [4.8]
1.900 [48.26]
MOUNTING INSERTS M3 X 0.5 THRU, 4 PLACES MAX. TORQUE, 8 IN/LBS
2.28 [57.91] MAX
OUTPUT ADJUST VOLTAGE
This feature allows the user to accurately adjust the module's output voltage set point to a specified level. This is achieved by connecting a resistor or potentiometer from the TRIM terminal to either the +Vout terminal (for increased Vout) or the -Vout terminal (for decreased Vout). The formulae below describe the trim resistor value to obtain a Vout change of %. VO is output voltage prior to adjustment (3.3V, 5V, 12V, 15V, or 24V). Radj - up =
OVP NOTE
Special attention should be given to the peak voltage deviation during a dynamic load step when trimming the output above the original set point to avoid tripping the overvoltage protection circuit. Should an OVP condition occur, the converter will go into a latch condition and must be externally reset before it will return to normal operation.
(
Vo(100 + %) 1.225%
_
(100 + 2%)
%
) k
Radj - down =
(100 - 2) %
k
C&D Technologies (Power Electronics) Ltd. Shannon, Co. Clare, Ireland Tel: +353.61.474.133 Fax:+353.61.474.141
Power Electronics Division, United States 3400 E Britannia Drive, Tucson, Arizona 85706 Tel: 800.547.2537 Fax: 520.770.9369
C&D Technologies, (NCL) Milton Keynes MK14 5BU UK Tel: +44 (0)1908 615232 Fax: +44 (0)1908 617545
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
VKA50xS
Rev C
3/2001
4

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