WPA50
Corporate: www.cdtechno.com
Corporate: www.cdtechno.com
Product: www.cdpoweronline.com
18 Amp Single Output Eighth Brick DC/DC Converter
Industry Standard Footprint & Size -
2.3” x 0.9” x 0.37”
(58.42mm x 22.88mm x 9.4mm)
High Efficiency - Up To 90%
Wide Input Voltage Range: 36 – 75V
DC
Output Voltages: 1.2 V, 1.5V, 1.8V,
2.2V, 2.5V, 3.3V & 5.0V
Through Hole and SMT
Position Perfect
TM
Models
Output Trim Function
Remote Output Sense
Remote ON/OFF (Positive or
Negative Logic)
Output Overcurrent Protection
Input Side “L” Filter
No Minimum Load Required
Isolation Voltage of 2000 V
DC
High Reliability
Fixed Frequency Operation
Safety per UL/CUL 60950 and VDE to EN
60950. CE Approved. Basic Insulation.
TNV-SELV Isolation Requirements
C&D Technologies, Power Electronics
Division is ISO9001:2000 Certified
No Heatsinks
Low Profile and Low Weight
Thermal Shutdown
Undervoltage Lockout
The WPA50 Series is a 50 Watt single
output, low-profile DC-DC converter in
an industry standard package of 2.3” x
0.9” x 0.37” (58.42mm x 22.86mm x
9.4mm). The WPA50 uses unique
proprietary technologies to deliver ultra-
high efficiencies and excellent thermal
performance. It includes extensive
control and protection features for
maximum flexibility and provides a
versatile solution for a whole range of
applications with its input voltage range
of 36-75 V
DC
and output voltages
between 1.2V
DC
and 5.0V
DC
.
The power dissipation of the WPA50
series is so low that a heat sink is not
required. The product features fast
dynamic response characteristics and
low output ripple critical for low voltage
applications. WPA DC-DC converter
modules are certified to UL/CUL 60950,
and VDE to EN60950. It is designed to
meet CISPR22/EN55022/FCC15J Class B
specs for EMI levels with external
filtering.
This high quality and highly reliable
product is competitively priced and an
ideal solution for distributed power,
telecoms and datacom applications.
PRODUCT SELECTION CHART
NOMINAL
INPUT
VOLTAGE
MODEL
WPA50R48S012
WPA50R48S015
WPA50R48S018
WPA50R48S022
WPA50R48S025
WPA50R48S033
WPA50R48S050
(V
DC
)
48
48
48
48
48
48
48
RATED
OUTPUT
VOLTAGE
(V
DC
)
1.2
1.5
1.8
2.2
2.5
3.3
5.0
OUTPUT CURRENT
MIN
RATED
LOAD(A)
0.0
0.0
0.0
0.0
0.0
0.0
0.0
OUTPUT (A)
18
18
18
18
18
15
10
INPUT
CURRENT
RATED LOAD (A)
0.58
0.70
0.80
0.99
1.11
1.20
1.17
EFFICIENCY
(%)
MIN
80
82
85
85
85
88
90
ABSOLUTE MAXIMUM RATINGS
Output Short-Circuit Duration
Internal Power Dissipation
Lead Temperature (soldering, 10 seconds max)
Continuous Input Voltage
Storage Temperature
Input to Output Isolation
Product: www.cdpoweronline.com
WPA50
REV D TH/SMT 8/2004
Continuous
8 Watts
+300°C
75 VDC
+125°C
2000 V
DC
1
SPECIFICATIONS, ALL MODELS
Specifications are at T
A
= +25°C, Airflow = 300LFM (1.5m/s) at nominal input voltage unless otherwise specified.
PARAMETER
INPUT
Voltage Range
Reflected Ripple Current
Inrush Charge
Maximum Input Current
1.2 Vout
1.5 Vout
1.8 Vout
2.2 Vout
2.5 Vout
3.3 Vout
5.0 Vout
INPUT CONTROL
Temperature Shutdown
Temperature Hysteresis
Quiescent Standby Current
Power Dissipation
Undervoltage Shutdown
Undervoltage Hysteresis
ISOLATION
Input/Output Isolation Voltage
Resistance
Capacitance
Leakage Current
OUTPUT
Rated Power
CONDITIONS
Vin = 48V, Io=I Rated
Vin = 48V, Io=I Rated
MIN
36
TYP
48
450
42
MAX
75
600
UNITS
V
DC
mApk-pk
µC
A
A
A
A
A
A
A
Vin=36V
0.75
0.93
1.10
1.31
1.50
1.60
1.55
115
5
4
2.00
35.0
3.00
INPUT
Vin = 48V
No Load, Remote On/Off
Disabled, Vin = 48Vdc
31.50
0.50
3
°C
°C
mA
W
V
V
32.5
2
240 Vrms, 50Hz
WPA50R48S012
WPA50R48S015
WPA50R48S018
WPA50R48S022
WPA50R48S025
WPA50R48S033
WPA50R48S050
-5.0
2000
10
1.5
100
22
27
33
40
45
50
50
1.0
±0.002
2250
V
DC
M
Ω
nF
µA
W
W
W
W
W
W
W
% of V
NOM
% of V
NOM
%/°C
%
%
mVp-p
OUTPUT
Voltage Setpoint Accuracy
Output Voltage Trim Range
Temperature Coefficient
Output Voltage Regulation
Line Regulation
Load Regulation
Ripple & Noise (NOTE 1)
Transient Response
1.2 - 2.5 Vout
3.3 - 5.0 Vout
Turn-On Time
Remote Sense Compensation
Overcurrent Protection
GENERAL
Switching Frequency
MTTF per ML-HDBK-217
Ground Benign
Operating Ambient Temperature
1.5
+8.0
±0.005
0.50
0.60
75
Vin = 36V - 75V, Iout = Max
Vin = 48V, Iout = 0-Max
Vin = 48V, < 20Mhz bandwidth
Step change in output current
(50%-100% Step @ 0.2A/
µs
)
Vin = 48V
Vin = 48V
Vin = 48V
Vin = 48V
105
380
Circuit Stress Method
TA = +25°
-40
0.30
0.30
200
8
6
500
8
140
420
% of V
NOM
% of V
NOM
mS
%
%
KHz
Hrs
°C
400
TBD
85
NOTE 1:
Measured at 20 MHz bandwidth across a
10µf
multi layer ceramic capacitor located approximately 1” from output terminals.
Product: www.cdpoweronline.com
WPA50
REV D TH/SMT 8/2004
2
MECHANICAL (THROUGH HOLE)
PIN FUNCTIONS
.370 [9.40]
MAX
A
.135 [3.43]
.188 [4.78]
Ø.060 [1.52] 6 Plcs
Ø.040 [1.02] 6 Plcs
Ø.080 [2.03] 2 Plcs
Ø.062 [1.57] 2 Plcs
2.300 ±.010
[58.42 ±.25]
1
2
3
4
5
6
7
8
NOTES:
+Vin
Remote On/Off
-Vin
-Vout
- Sense
Trim
+ Sense
+Vout
.750
[19.05]
.450
[11.43]
.150
[3.81]
Pin placement tolerance: +.010
3
4
5
2
6
7
1
8
.750 [19.05]
.600 [15.24]
.450 [11.43]
.300 [7.62]
.150 [3.81]
Pin material: Copper
Pin Finish: Matte Tin over Nickel
Converter weight: [16g]
.900 ±.010
[22.88 ±.25]
.000
[0.00]
.000 [0.00]
.150 [3.81]
Dimensions are in inches [mm]
ORDERING INFORMATION (THROUGH HOLE)
To Find Model Number
WPA50R48S
y
-
Device Family
50 Watt, Single Output,
Eighth Brick, 48VDC Input Range
Model Number
Selected from Product Selection Chart (above)
y = 012 = 1.2V, 015 = 1.5V, 018 = 1.8V, 022 = 2.2V,
025 = 2.5V, 033 = 3.3V, 050 - 5.0V,
Remote On/Off Logic
No Number = Positive Logic
1 = Negative Logic
Model Numbers
WPA50R48S012
WPA50R48S015
WPA50R48S018
WPA50R48S022
WPA50R48S025
WPA50R48S033
WPA50R48S050
WPA50R48S012-1
WPA50R48S015-1
WPA50R48S018-1
WPA50R48S022-1
WPA50R48S025-1
WPA50R48S033-1
WPA50R48S050-1
2.150 [54.61]
BOTTOM VIEW
(PIN SIDE)
Part Numbers
6064958
6064959
6064960
6064961
6064962
6064963
6064964
6064967
6064968
6064969
6064970
6064971
6064972
6064973
Product: www.cdpoweronline.com
WPA50
REV D TH/SMT 8/2004
3
MECHANICAL (SMT)
PIN FUNCTIONS
.370 [9.40]
MAX
.135 [3.43]
Ø.060 [1.52] 6 Plcs
Ø.080 [2.03] 2 Plcs
2.300 ±.010
[58.42 ±.25]
1
2
3
4
5
6
7
8
NOTES:
+Vin
Remote On/Off
-Vin
-Vout
- Sense
Trim
+ Sense
+Vout
.750
[19.05]
.450
[11.43]
.150
[3.81]
Pin placement tolerance: +.010
4
.750 [19.05]
.600 [15.24]
.450 [11.43]
.300 [7.62]
.150 [3.81]
Pin material: Copper
Pin Finish: Matte Tin over Nickel
with Tin coating on contact
surface
Converter weight: [16g]
.900 ±.010
[22.88 ±.25]
.000
[0.00]
.000 [0.00]
.150 [3.81]
2.150 [54.61]
BOTTOM VIEW
(PIN SIDE)
Dimensions are in inches [Millimeters]
* Pin Co-Planarity within 0.004”
ORDERING INFORMATION (SMT)
To Find Model Number
WPA50R48S
y
-
Device Family
50 Watt, Single Output,
Eighth Brick, 48VDC Input Range
Model Number
Selected from Product Selection Chart (above)
y = 012 = 1.2V, 015 = 1.5V, 018 = 1.8V, 022 = 2.2V,
025 = 2.5V, 033 = 3.3V, 050 - 5.0V,
Remote On/Off Logic
2 = Positive Logic, SMT
3 = Negative Logic, SMT
Model Numbers
WPA50R48S012-2
WPA50R48S015-2
WPA50R48S018-2
WPA50R48S022-2
WPA50R48S025-2
WPA50R48S033-2
WPA50R48S050-2
WPA50R48S012-3
WPA50R48S015-3
WPA50R48S018-3
WPA50R48S022-3
WPA50R48S025-3
WPA50R48S033-3
WPA50R48S050-3
Part Numbers
WPA50R48S012-2
WPA50R48S015-2
WPA50R48S018-2
WPA50R48S022-2
WPA50R48S025-2
WPA50R48S033-2
WPA50R48S050-2
WPA50R48S012-3
WPA50R48S015-3
WPA50R48S018-3
WPA50R48S022-3
WPA50R48S025-3
WPA50R48S033-3
WPA50R48S050-3
Product: www.cdpoweronline.com
WPA50
REV D TH/SMT 8/2004
4
Operation
Remote Sense
The remote sense feature of the WPA50 can be used to compen-
sate for voltage drops in the output power lines by sensing output
voltage directly at the point of load. To enable this feature,
connect the +Sense and –Sense pins to the +Vout and –Vout
pins, respectively, at the point in the circuit where the tightest
regulation is required (Figure
1).
The sense leads conduct very
little current compared with the power leads and therefore provide
a more accurate indication of load voltage for regulation purposes.
This enables the converter to increase (or decrease) its output
voltage to compensate for any load distribution losses, allowing
for a more precise load voltage. Refer to the product data sheet
for the maximum output voltage compensation range of the sense
function.
In general, the line resistance, or load drop, between the output
pins of the converter and load should be minimized. A large line
resistance, with a regulated load voltage, will result in a higher
output voltage at the converter output pins, +Vout and -Vout. To
prevent exceeding the converter’s output power limits, a higher
output voltage will require a reduction in the maximum allowable
output current in accordance with the voltage/current power
relationship. To minimize the line resistance between the con-
verter and load, the converter should be placed as close to the
load as possible. Line resistance can further be decreased by
using heavy gauge wire or increasing the PC board voltage bus
cross section.
If +Sense and -Sense are not connected in this manner the
ouput voltage could drift beyond the nominal range.
+ Vin
+ Vout
+ Sense
C
B
C
L
ON/OFF
WPA50
(Top View)
Trim
-
Sense
Load
C
B
- Vin
- Vout
Figure 1 – Remote Sensing Circuit
Output Voltage Trim
The WPA50’s output voltage may be adjusted high or low by
an amount indicated on the product data sheet. As shown
in
Figure 2,
to raise the converter’s output voltage a resistor
must be placed between the Trim pin and +Vout pin.
+ Vout
+ Sense
ON/OFF
R
T
Load
+ Vin
WPA50
(Top View)
Trim
-
Sense
- Vin
- Vout
Figure 2 – Trim Up Circuit
When using remote sense with dynamic loads, the transient
response at the point of load may be limited by the inductance
To lower the converter output voltage a resistor must be
present in the power lines. Severe load steps may require the
placed between the Trim pin and -Vout pin as shown in
addition of a capacitor C
L
across the output lines. When the load
Figure 3.
demands an immediate increase in load current, this capacitor
helps to supply a portion of the current and reduces the burden on
+ Vout
+ Vin
the converter.
+ Sense
When the load is physically distanced from the converter, the
inductance of the power leads, and any bypass conductance at
the load, can result in increased phase shift in the converter’s
feedback loop, causing instability. This situation can be elimi-
nated by inserting bypass capacitors (C
B
) from the outputs to the
sense leads directly at the output pins. These capacitors provide
AC feedback, removing the long power lines from the converter’s
feedback loop.
ON/OFF
WPA50
(Top View)
Trim
-
Sense
Load
R
T
- Vin
- Vout
Figure 3 – Trim Down Circuit
The resistance value required to achieve the desired
amount of positive/negative trim can be determined by
If remote sensing is not desired then +Sense and -Sense must be referring to the trim table for each model. If trimming is not
desired then the Trim pin may be left unconnected.
tied to their respective outputs for proper operation.
Product: www.cdpoweronline.com
WPA50
REV D TH/SMT 8/2004
5
