Product Data Sheet
75 W
ATT
S
INGLE
O
UTPUT
H
IGH
D
ENSITY
DC/DC C
ONVERTER
VKA75xS Series
FEATURES
G
18 - 36V & 33 - 75V INPUT RANGE
G
SMALL SIZE: 2.28" X 2.4" X 0.50"
G
HIGH EFFICIENCY: 87% TYPICAL AT 5V
G
100µS TRANSIENT RESPONSE 50-100% LOAD STEP
µ
G
420kH
Z
FIXED-FREQUENCY OPERATION
G
OPERATION TO +100°C BASEPLATE TEMP.
G
PRIMARY REMOTE ON/OFF, CHOICE OF POS/NEG
LOGIC
G
ADJUSTABLE OUTPUT VOLTAGE
G
REMOTE SENSE
G
CONTINUOUS SHORT-CIRCUIT PROTECTION
G
THERMAL SHUTDOWN
G
SAFETY PER UL1950, EN 60950 AND CSA 22.2 #234
G
CASE GROUND PIN
DESCRIPTION
The VKA75xS Series DC/DC converters present an eco-
nomical 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 VKA75xS's proprietary control circuitry responds to
50-100% load steps in 100µSeconds to within 1% nomi-
nal Vout.
The patented fixed frequency architecture combined with
surface mount technology results in a compact, efficient
and reliable solution to DC/DC conversion requirements.
Efficiency(%)
Input
Model
VKA75MS02
VKA75MS03
VKA75MS05
VKA75MS12
VKA75MS15
VKA75MS24
(33-75)
48VDC
Efficiency(%)
Input
Model
VKA75LS02
VKA75LS03
VKA75LS05
VKA75LS12
VKA75LS15
VKA75LS24
(18-36)
24VDC
V
OUT
2.0V
3.3V
5.0V
12.0V
15.0V
24.0V
I
OUT
(A)
15.0
15.0
15.0
6.3
5.0
3.1
Note (1)
V
OUT
2.0V
3.3V
5.0V
12.0V
15.0V
24.0V
I
OUT
(A)
15.0
15.0
15.0
6.3
5.0
3.1
76
81
86
88
89
89
Note
(1)
Voltage (VDC)
Min
75
80
85
87
88
89
Typ
76
81
86
88
89
90
Voltage (VDC)
Min
Typ
77
82
87
89
90
90
AGENCY APPROVALS
Internet: http://www.cdpowerelectronics.com
Power Electronics Division, United States
3400 E Britannia Drive, Tucson, Arizona 85706
Phone: 520.295.4100 Fax: 520.770.9369
VKA75xS Rev B 7/99
Power Electronics Division, Europe
C&D Technologies (Power Electronics) Ltd.
132 Shannon Industrial Estate, Shannon, Co. Clare, Ireland
Tel: +353.61.474.133
Fax:+353.61.474.141
Page 1
COMMON SPECIFICATIONS
Specifications typical at T
CASE
= +40°C, nominal input voltage, rated output current unless otherwise specified.
PARAMETER
INPUT
Voltage Range
VKA75LS
VKA75MS
Maximum Input Current
VKA75LS
VKA75MS
Reflected Ripple Current
Input Ripple Rejection
No Load Input Current LS/MS
Power Dissipation LS/MS
No Load
Standby, Primary On/Off Disabled LS/MS
Inrush Charge
VKA75LS
VKA75MS
Quiescent Operating Current
Primary On/Off Disabled
CONDITIONS
MIN
TYP
MAX
UNITS
18
33
V
IN
= 16VDC
V
IN
= 27VDC
Peak - Peak
DC to 1KHz
24
48
36
75
5.5
3.3
VDC
VDC
A
A
mA
dB
mA
W
W
50
20
60
50/100
3.6/4.8
0.18/0.4
V
IN
= V
IN
max.
0.520
0.360
8
12
mC
mC
mA
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
ISOLATION
Input to Output
Input to Baseplate
Output to Baseplate
Resistance
Capacitance
Leakage Current
0
High Line to Low Line
No Load to Rated Load
DC to 20MHz BW
test
125%
50 to 100% Load Step
di/dt = 1.0A/µSec
V
OUT
, 1% of Nominal Output
Peak Test for 2 Seconds
1500
1500
500
10
2000
180
2%
100
1
0.02
0.02
±.02
1%
75
0.05
0.05
130%
110%
135%
W
%
%
%
%/°C
V
OUT
, Nom
l
OUT
, Nom
l
OUT
, Nom
V
V
OUT
, Nom
µSec
VDC
VDC
VDC
MΩ
pF
µA,
rms
V
ISO
= 240VAC, 60Hz
GENERAL
Efficiency, Line, Load, Temp. (3)
Switching Frequency
Remote Sense Compensation
Output Voltage Adjust Range
-12V & higher
(4)
Remote On/Off Control Inputs
Primary
Open Collector/Drain
Sink Current-Logic Low
Vlow
Vhigh
Turn-on Time
Within 1% of Rated Output
400
420
-50% / +25%
440
0.5
KHz
V
V
OUT
, Nom
mA
V
V
mSec
10.0
1.0
1
2
12.5
Weight
TEMPERATURE
Operation/Specification
Storage
Shutdown Temperature
Thermal Impedance, case-ambient
Lead Solder Temperature
85 (3.0)
g (oz.)
Case Temperature
Case Temperature
Case Temperature
10 Seconds max
-40
-55
+100
+25
+25
7.1
+100
+125
+115
+300
°C
°C
°C
°C/W
°C
( ) See NOTES on page 3.
Page 2
VKA75xs Rev B 7/99
NOTES:
(1)
(2)
(3)
(4)
See Typical Performance Curves, page 3
Continuous Mode
See graphs for Efficiency vs. Output Load, V
IN
, T
CASE
3.3V Models Limited in Trim Down Range
ORDERING INFORMATION
VKA75 xSzz -
Device Family
Indicates 75 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)
(5) Consult Factory for Details
TYPICAL PERFORMANCE CURVES
T
A
= +40°C, nominal input voltage, rated load, recommended external components applied, unless otherwise specified.
EFFICIENCY vs OUTPUT LOAD
95
95
28V
24V
15V
EFFICIENCY vs OUTPUT LOAD
EFFICIENCY vs TEMPERATURE
+10
90
12V
5V
90
Change in Efficiency (%)
Efficiency (%)
Efficiency (%)
85
3.3V
85
+5
80
80
15V
TYP
100% Load
20% Load
28V
75
75
24V
-5
70
0
20
40
60
80
Output Load (% of Rated)
100
70
0
20
40
60
80
Output Load (% of Rated)
100
-10
-55
-15
+25
Tcase (°C)
+65
+105
EFFICIENCY vs INPUT VOLTAGE
+10
Normalized Output Ripple
OUTPUT RIPPLE vs INPUT VOLTAGE
1.50
3.0
OUTPUT RIPPLE vs TEMPERATURE
+5
1.25
Normalized Output Ripple
Change in Efficiency (%)
2.0
TYP
100% Load
50% Load
1.00
1.0
-5
0.75
0.5
10% Load
-10
Vin, min
Vin, typ
Vin (VDC)
Vin, max
0.50
Vin, min
0.33
Vin, typ
Vin (VDC)
Vin, max
-55
-15
+25
Tcase (°C)
+65
+105
Change in Reflected Ripple Current (%)
+100
REFLECTED RIPPLE CURRENT
vs TEMPERAURE
T
POWER DERATING WITH NO HEATSINK
16
POWER DERATING WITH NO HEATSINK
14
+50
12
TYP
Dissipated Power, Po (W)
10
Dissipated Power, P
D
(W)
-50
8
22
20
18
16
14
12
10
8
6
4
2
0
400 LFM
200 LFM
Airflow
400 LFM
Airflow
Natural
Convection
200
LFM
-100
-55
-15
+25
Tcase (°C)
+65
+105
6
Natural
Convection
4
2
0
0
25
25
50
75
100
100
75
50
Ambient Temperature (°C)
Ambient Temperature (°C)
VKA75xS Rev B 7/99
Page 3
MECHANICAL
NOTES:
All dimensions are in inches (millimeters).
PIN PLACEMENT TOLERANCE: ± 0.005"
0.530 MAX
[13.46]
0.20 [5.1]
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
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 VOLTAGE ADJUST
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
∆
%. V
O
is output
voltage prior to adjustment (3.3V, 5V, 12V, 15V, 24V or
28V).
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
∆
%)
∆
%
)
kΩ
Radj - down =
(
100
-
2
)
∆
%
kΩ
Page 4
VKA75xs Rev B 7/99
