1
2401 Stanwell Drive, Concord Ca. 94520 Ph: 925-687-4411 Fax: 925-687-3333 www.calex.com Email: sales@calex.com
ECO 141118-1, 150722-1, 170530-3, 171030-1
75 WATT WDE SERIES
DIGITAL DC/DC CONVERTERS
Features
‘Black Box’ digital fault datalogging
Digitally Congurable voltage, current & over-
temperature
Digitally congurable fault response
High power density
4:1 Input voltage range
Small size 2.5” x 1.1” x 0.50”
Efciency up to 90%
Excellent thermal performance with metal case
Auto-softstart
Constant frequency
Remote sense
Remote ON/OFF
Analog and digital voltage trim
No minimum load requirement
Water washable, high humidity applications
Good shock and vibration damping
Available in both RoHS and non-RoHS
construction. See ordering info below.
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Model
Input Range
VDC Vout
VDC
Iout
ADC
Min Max
24S5.15WDE 9 36 5.0 15
24S12.6WDE 9 36 12 6
24S24.3WDE 9 36 24 3
24S28.3WDE 9 36 28 2.5
24S48.1WDE 9 36 48 1.5
48S24.3WDE 18 75 24 3
48S28.3WDE 18 75 28 2.5
48S48.1WDE 18 75 48 1.5
The 4:1 Input Voltage 75 Watt Single WDE DC/DC
converter provides a precisely regulated dc output. The
output voltage is fully isolated from the input, allowing the
output to be positive or negative polarity and with various
ground connections. The 75 Watt WDE meets the most
rigorous performance standards in an industry standard
footprint for mobile (12Vin), process control (24Vin),
military COTS (28Vin) and higher Vin applications.
The 4:1 Input Voltage 75 Watt WDE includes remote
sensing, ultra-wide output voltage trim, and remote ON/
OFF. The digital power management enables increased
reliability, congurability, voltage / current precision and
fault management, including:
Description
To order RoHS, add (RoHS) to the part number
• Precision, adjustable over-temperature protection
• Congurable input under and over voltage protection
• Congurable current-limit inception and shut-down delay
• Logging of historical fault events in non-volatile memory
• Precision (+/-0.2%) output voltage accuracy and trim
• Monitoring of Vin, Vout, Iout and Temperature
• Digital dynamic adjustment of Vout
• Digital warning thresholds for faults
2
2401 Stanwell Drive, Concord Ca. 94520 Ph: 925-687-4411 Fax: 925-687-3333 www.calex.com Email: sales@calex.com
ECO 141118-1, 150722-1, 170530-3, 171030-1
75 WATT WDE SERIES
DIGITAL DC/DC CONVERTERS
24V Input Parameters
Model 24SXX-YY-WDE Units
Voltage Range
MIN
TYP
MAX
9.0
24.0
36.0
V
Input Overvoltage (100 ms) MAX 50 [Unit may shut down at input overvoltage set point] V
Input Ripple Rejection (120Hz) TYP 20 [With recommmended ext. LC lter] dB
Undervoltage Lockout TYP Start-up: 9.0 / Shut-down: 8.75 V
Input Reverse Voltage Protection Yes - Main FET Body Diode Conduction 2A max/1Sec
Inrush Current MAX 0.05 [With recommended ext. LC lter] A2s
Reected Ripple TYP 50 [With recommended ext. LC lter] mA rms
Switching Frequency TYP 275 kHz
Recommended Fuse See Note 2 A
External Input Capacitance MIN 30 (Ceramic) µF
24V Output Parameters
Model 24S5.15WDE 24S12.6WDE 24S24.3WDE 24S28.3WDE 24S48.1WDE Units
Output Voltage 5.0 12 24 28 48 V
Output Voltage
Setpoint Accuracy MAX 0.2 %
Turn On Overshoot TYP 5 %
Temperature Coefcient (5) TYP
MAX 0.02 %/ºC
Noise (3) TYP
TYP
50
25
120
50
240
80
280
100
480
150
mV p-p
mV
rms
Load Current MIN
MAX
0
15
0
6
0
3
0
2.5
0
1.5 A
Load Transient Overshoot (4) TYP 5 %
Load Transient Recovery Time (4) TYP 500 µs
Load Regulation (6)
Min-Max Load
TYP
MAX
0.2
1%
Line Regulation
Vin = Min-Max
TYP
MAX
0.2
1%
Overvoltage Protection (OVP)
Threshold
OVP Type - Non-latching
Open Loop Overvoltage Clamp
Hiccup Mode
TYP 120 %
Output Current Limit
Vout = 90% of Vout-nom TYP 120 %
External Output Capacitance MIN
MAX
300
3000
20
1000
20
400
20
300
20
200 µF
Efciency - Max Load TYP 91 92 87 89 88 %
3
2401 Stanwell Drive, Concord Ca. 94520 Ph: 925-687-4411 Fax: 925-687-3333 www.calex.com Email: sales@calex.com
ECO 141118-1, 150722-1, 170530-3, 171030-1
75 WATT WDE SERIES
DIGITAL DC/DC CONVERTERS
48V Input Parameters
Model 48SXX-YY-WDE Units
Voltage Range
MIN
TYP
MAX
18.0
48.0
75.0
V
Input Overvoltage (100 ms) MAX 100 [Unit may shut down at input overvoltage set point] V
Input Ripple Rejection (120Hz) TYP 20 [With recommmended ext. LC lter] dB
Undervoltage Lockout TYP Start-up: 17.8 / Shut-down: 17.5 V
Input Reverse Voltage Protection Yes - [Main FET Body Condcution 2.5A / 1Sec Max]
Inrush Current MAX 0.1 [With recommended ext. LC lter] A2s
Reected Ripple TYP 50 [With recommended ext. LC lter] mA rms
Switching Frequency TYP 275 kHz
Recommended Fuse See Note 2 A
External Input Capacitance MIN 20 (Ceramic) µF
48V Output Parameters
Model 48S24.3WDE 48S28.3WDE 48S48.1WDE Units
Output Voltage 24 28 48 V
Output Voltage
Setpoint Accuracy MAX 0.2 %
Turn On Overshoot TYP 5 %
Temperature Coefcient (5) TYP
MAX 0.02 %/ºC
Noise (3) TYP
TYP
240
80
280
100
480
150
mV p-p
mV rms
Load Current MIN
MAX
0
3
0
2.5
0
1.5 A
Load Transient Overshoot (4) TYP 5 %
Load Transient Recovery Time (4) TYP 500 µs
Load Regulation (6)
Min-Max Load
TYP
MAX
0.2
1%
Line Regulation
Vin = Min-Max
TYP
MAX
0.2
1%
Overvoltage Protection (OVP)
Threshold
OVP Type - Non-latching
Open Loop Overvoltage Clamp
TYP 120 %
Output Current Limit
Vout = 90% of Vout-nom TYP 120 %
External Output Capacitance MIN
MAX
20
400
20
300
20
200 µF
Efciency - Max Load TYP 87 89 89 %
4
2401 Stanwell Drive, Concord Ca. 94520 Ph: 925-687-4411 Fax: 925-687-3333 www.calex.com Email: sales@calex.com
ECO 141118-1, 150722-1, 170530-3, 171030-1
75 WATT WDE SERIES
DIGITAL DC/DC CONVERTERS
General Specications
All Models Units
ON/OFF Function
Converter - ON
HIGH Logic Level / Leave
ON/OFF Pin Open (11)
MIN 3.0 V
External Leakage Current
Allowed for Logic High (7) MAX 10 µA
Converter - OFF
LOW Logic Level / Tie
ON/OFF Pin to -INPUT (11)
MAX 1.0 V
Sinking Current for Logic
Low MAX 500 µA
Idle Current
(Module is OFF) TYP 40 mA
Turn-on Time to 1% error TYP 40 ms
Output Voltage Remote Sensing (12)
Maximum Voltage Drops
on Leads MAX 750 mV
Line Regulation under
remote sensing
TYP
MAX
0.2
1%
Load Regulation under
remote sensing
TYP
MAX
0.2
1%
Output Voltage Trim (12)
Trim Range MIN
TYP
-20
+10 % of Vout
Input Resistance TYP 47.5 kΩ
Open Circuit Voltage TYP 2.0 V
Trim Limit
Maximum Output Voltage TYP 110 % of Vout
Isolation
Input to Output Isolation
10µA Leakage MAX 1544 VDC
Input to Output Resistance MIN 10 MΩ
Input to Output
Capacitance TYP 3300 pF
Environmental
MTBF
Telcordia (Bellcore)
standard SR-332, issue
2, using Method 1.
50% electrical stress, 40ºC
Components
10.9 Million hours
Case Operating
Temperature Range
MIN
MAX
-55
+100 ºC
Storage Temperature MIN
MAX
-55
+120 ºC
Thermal Impedance (8) TYP 9 ºC/W
Thermal Shutdown Internal
Temperature (Auto Restart) TYP 110 ºC
General
Unit Weight 55 g
Case Dimension 2.5” x 1.1” x 0.50”
Designed to meet UL/cUL 60950, IEC/EN 60950-1
Notes:
(1) All parameters measured at Tc=+25ºC ambient, Vin = Vnom,
maximum rated load, unless otherwise noted. Refer to CALEX
Application Notes for denition of terms, measurement circuits
and other information.
(2) External fusing should be used for system protection in the event
of a catastrophic failure. See CALEX Application Note 9 in the
Calex DC/DC Catalog to determine the correct fuse.
(3) Output noise is measured with a 10µF ceramic capacitor and a
1µF ceramic capacitor connected across the output pins. The
fundamental component of noise is at the switching frequency.
Using smaller value capacitors will make the output noise slightly
higher. Bandwidth limit is 20 MHz. In system board design high-
voltage capacitors between input and output from 1000pF to
6800pF can be used to reduce common-mode noise.
(4) Load Transient Overshoot is the output voltage peak amplitude,
referenced to the nal value, due to a step load change from
50% of maximum load to 75% of maximum load. “Load Transient
Overshoot” and “Dynamic Response” are the same specication.
Load Transient Recovery Time is the time it takes the output
to return to the specied voltage error band centered around
the nal value. Transient response may degrade at low load
currents.
(5) Temperature coefcient is dened for case temperatures. Output
voltage deviation is calculated as the maximum resulting from
either 1) 25ºC case to maximum operating case temperature, or
2) 25ºC case to minimum operating case temperature.
(6) Load regulation is dened as the output voltage change resulting
from a load current change from minimum to maximum. The
voltage is measured at the output pins.
(7) When an external ON/OFF switch is used, such as an open
collector switch, logic high requires the switch to be high-
impedance. Switch leakage currents greater than 10µA may be
sufcient to trigger the ON/OFF to the logic-low state.
(8) Thermal impedance is tested with the converter mounted
vertically and facing another printed circuit board 1/2 inch away.
Thermal impedance is approximately 9ºC/W.
(9) Water washability - Calex DC/DC converters are designed
to withstand most solder/wash processes. Careful attention
should be used when assessing the applicability in your specic
manufacturing process. Converters are not hermetically sealed.
(10) The input impedance on these units must be kept to a maximum of
100mΩ. In order to support this requirement, this converter needs
55µF of capacitance (low ESR) for every 1.0µH of inductance
between the power source and the DC/DC converter.
(11) The range between 1V as maximum turn off voltage and 3V as
minimum turn on voltage is considered the dead-band. Operation
in the dead-band is not recommended.
(12) Refer to Calex Application Note 4 for methods to apply Remote
Sense and Trim.
(13) Specications subject to change without notice.
(14) RoHS Compliance:
See Calex Website www.calex.com/RoHS.html for the complete
RoHS Compliance statement.
The RoHS marking is as follows.
5
2401 Stanwell Drive, Concord Ca. 94520 Ph: 925-687-4411 Fax: 925-687-3333 www.calex.com Email: sales@calex.com
ECO 141118-1, 150722-1, 170530-3, 171030-1
75 WATT WDE SERIES
DIGITAL DC/DC CONVERTERS
Characteristic Curves:
24S5.15WDE Efciency Curve 24S5.15WDE Power Dissipation
24S5.15WDE
50
55
60
65
70
75
80
85
90
95
1 3 5 7 9 11 13 15
Current (A)
Efficiency(%)
9Vin
24Vin
36Vin
24S5.15WDE
2
3
4
5
6
7
8
9
10
1 3 5 7 9 11 13 15
Current (A)
Power Dissipation(W)
9Vin
24Vin
36Vin
24S12.6WDE Efciency Curve 24S12.6WDE Power Dissipation
24S12.6WDE
70
72
74
76
78
80
82
84
86
88
90
92
94
1 2 3 4 5 6
Current (A)
9Vin
24Vin
36Vin
24S12.6WDE
1
2
3
4
5
6
7
8
9
10
1 2 3 4 5 6
Current (A)
Power Dissipation(W)
9Vin
24Vin
36Vin
24S24.3WDE Efciency Curve 24S24.3WDE Power Dissipation
24S24.3WDE
70
72
74
76
78
80
82
84
86
88
90
0.5 1 1.5 2 2.5 3
Current (A)
Efficiency(%)
9Vin
24Vin
36Vin
24S24.3WDE
2
3
4
5
6
7
8
9
10
11
12
0.5 1 1.5 2 2.5 3
Current (A)
Power Dissipation(W)
9Vin
24Vin
36Vin
24S28.3WDE Efciency Curve 24S28.3WDE Power Dissipation
24S28.3WDE
70
72
74
76
78
80
82
84
86
88
90
0.5 1 1.5 2 2.5
Current (A)
Efficiency(%)
9Vin
24Vin
36Vin
24S48.1WDE
2
4
6
8
10
12
14
16
0.25 0.5 0.75 1 1.25 1.5
Current (A)
Power Dissipation(W)
9Vin
24Vin
36Vin
6
2401 Stanwell Drive, Concord Ca. 94520 Ph: 925-687-4411 Fax: 925-687-3333 www.calex.com Email: sales@calex.com
ECO 141118-1, 150722-1, 170530-3, 171030-1
75 WATT WDE SERIES
DIGITAL DC/DC CONVERTERS
24S48.1WDE Efciency Curve 24S48.1WDE Power Dissipation
48S24.3WDE Efciency Curve 48S24.3WDE Power Dissipation
48S28.3WDE Efciency Curve 48S28.3WDE Power Dissipation
24S48.1WDE
50
55
60
65
70
75
80
85
90
0.25 0.5 0.75 1 1.25 1.5
Current (A)
Efficiency(%)
9Vin
24Vin
36Vin
24S48.1WDE
2
4
6
8
10
12
14
16
0.25 0.5 0.75 1 1.25 1.5
Current (A)
Power Dissipation(W)
9Vin
24Vin
36Vin
48S24.3WDE
60
63
66
69
72
75
78
81
84
87
90
0.5 1 1.5 2 2.5 3
Current (A)
Efficiency(%)
18Vin
48Vin
75Vin
48S24.3WDE
2
3
4
5
6
7
8
9
10
11
12
0.5 1 1.5 2 2.5 3
Current (A)
Power Dissipation(W)
18Vin
48Vin
75Vin
48S28.3WDE
60
63
66
69
72
75
78
81
84
87
90
0.5 1 1.5 2 2.5
Current (A)
Efficiency(%)
18Vin
48Vin
75Vin
48S28.3WDE
3
4
5
6
7
8
9
10
11
12
0.5 1 1.5 2 2.5
Current (A)
Power Dissipation(W)
18Vin
48Vin
75Vin
48S48.1WDE
50
55
60
65
70
75
80
85
90
0.25 0.5 0.75 1 1.25 1.5
Current (A)
Efficiency(%)
18Vin
48Vin
75Vin
48S48.1WDE
2
4
6
8
10
12
14
16
0.25 0.5 0.75 1 1.25 1.5
Current (A)
Power Dissipation(W)
18Vin
48Vin
75Vin
48S48.1WDE Efciency Curve 48S48.1WDE Power Dissipation
7
2401 Stanwell Drive, Concord Ca. 94520 Ph: 925-687-4411 Fax: 925-687-3333 www.calex.com Email: sales@calex.com
ECO 141118-1, 150722-1, 170530-3, 171030-1
75 WATT WDE SERIES
DIGITAL DC/DC CONVERTERS
Pin Name Pin Dia.
(Typ.)
1 -Input 0.04”
2 On/Off 0.04”
3+Input 0.04”
4 -Output 0.06”
5 -Sense 0.04”
6 Trim 0.04”
7+ Sense 0.04”
8+Output 0.06”
9SDA (-Input Ref.) 0.04”
10 SCL (-Input Ref.) 0.04”
11 SCL (-Output Ref.) 0.04”
12 SDA (-Output Ref.) 0.04”
TOLERANCE: ALL DIMENSIONS
ARE TYPICAL IN INCHES
UNLESS OTHERWISE NOTED:
X.XX ±0.02
X.XXX ±0.005
8
2401 Stanwell Drive, Concord Ca. 94520 Ph: 925-687-4411 Fax: 925-687-3333 www.calex.com Email: sales@calex.com
ECO 141118-1, 150722-1, 170530-3, 171030-1
75 WATT WDE SERIES
DIGITAL DC/DC CONVERTERS
External Input Filter Recommendation
9 - 36Volt Input Range
18 - 75Volt Input Range
Reference Description Part Number Supplier
R1 1 Ω, 0.25W Any Any
L1 470 nH, 10.9A FP3-R47-R or Equivalent Cooper-Bussman
C1, C2, C3 10 µF, 50V, X5R, 1206 CGA5L3X5R1H106K or Equivalent TDK
C4 100 µF, 63V, 105C, Electrolytic UPM1J101MPD-ND or Equivalent Nichicon
Reference Description Part Number Supplier
R1 2.2 Ω, 0.25W Any Any
L1 1 µH, 6.2A FP3-1R0-R or Equivalent Cooper-Bussman
C1, C2, C3 4.7 µF, 100V, X7S, 1210 C3225X7S2A475M or Equivalent TDK
C4 47 µF, 100V, 105C, Electrolytic UPW2A470MPD or Equivalent Nichicon
Note: Capacitors C1, C2 and C3 to be placed within 0.5” of DC/DC input pins.
Note: Use only ceramic capacitors in positions C1, C2 and C3.