150 WATT HEW SINGLE SERIES
DC/DC CONVERTERS
Features
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Description
The 4: Input Voltage 50 W single HEW Series of DC/DC
converters provide precisely regulated dc outputs. The
output voltage is fully isolated from the input, allowing the
output to be positive or negative polarity and with various
ground connections. The HEW Series meets the most
rigorous performance standards in the industry standard
case size for data communications and process control
applications.
The 4: Input Voltage 50 Watt HEW Series includes
remote sensing, output trim, and remote ON/OFF.
Threaded-through holes are provided to allow easy
mounting or add a heat sink for extended temperature
use.
Selection Chart
Model
24S3.30HEW
24S5.30HEW
24S2.2HEW
24S5.0HEW
24S24.6HEW
48S3.30HEW
48S5.30HEW
48S2.2HEW
48S5.0HEW
48S24.6HEW
Input Range
VDC
Min
9
9
9
9
9
8
8
8
8
8
Max
36
36
36
36
36
75
75
75
75
75
Iin
ADC
TYP
5.00
7.80
7.8
7.0
7.0
2.45
3.60
3.57
3.50
3.50
Vout
VDC
3.3
5
2
5
24
3.3
5
2
5
24
Iout
ADC
30
30
2.5
0
6.26
30
30
2.5
0
6.26
4: Input voltage range
High power density
Small size 2.4” x 2.28” x 0.55”
Excellent thermal performance with metal baseplate
Volt-seconds clamp and fast over voltage
protection
Pulse-by-pulse current limiting, short circuit
frequency foldback, dead short shut down
Over-temperature protection
Auto-softstart
Low noise
Industry-standard pinout
Constant frequency during normal operation
Remote sense
Remote ON/OFF
Super energy saving, 8 mA input idle current
Output trim with very low temperature coefficient
Water washable, wide humidity application
Good shock and vibration damping
Available in both RoHS and Non-RoHS construction.
See ordering info below model selection chart
Default ON/OFF logic is positive.
Add -N to the model number to order negative ON/OFF logic.
To order RoHS, add (RoHS) to the part number.
240 Stanwell Drive, Concord Ca. 94520
Ph: 925-687-44
Fax: 925-687-3333
www.calex.com
Email: sales@calex.com
ECO# 050406-, 0806-, 00304-, 00726-2, 00923-
150 WATT HEW SINGLE SERIES
DC/DC CONVERTERS
Unless otherwise stated, these specifications apply for baseplate temperature T
b
=23±2ºC, nominal input voltage, and rated full load. ()
Input Parameters
Model
Voltage Range
Input Overvoltage (00 ms)
Input Ripple Rejection (20Hz)
Undervoltage Lockout
Input Reverse Voltage Protection
Input Current
Inrush Current
Reflected Ripple, 12µH
Source Impedance (3)
Efficiency
Switching Frequency
Recommended Fuse
No Load
00% Load
TYP
TYP
MAX
TYP
TYP
TYP
78
80
35
5.0
35
7.8
MIN
TYP
MAX
MAX
TYP
24S3.30HEW
24S5.30HEW
24S12.12HEW
9
24
36
50
60
Yes
Yes
35
7.8
0.5
30
85
260
(2)
86
86
35
7.0
35
7.0
mA
A
A
2
s
mA
p
-
p
%
kHz
A
24S15.10HEW
24S24.6HEW
Units
V
V
dB
Input Parameters
Model
Voltage Range
Input Overvoltage (00 ms)
Input Ripple Rejection (20Hz)
Undervoltage Lockout
Input Reverse Voltage Protection
Input Current
Inrush Current
Reflected Ripple, 12µH
Source Impedance (3)
Efficiency
Switching Frequency
Recommended Fuse
No Load
00% Load
TYP
TYP
MAX
TYP
TYP
TYP
8
85
25
2.45
25
3.60
MIN
TYP
MAX
MAX
TYP
48S3.30HEW
48S5.30HEW
48S12.12HEW
8
48
75
80
60
Yes
Yes
25
3.57
0.5
30
88
260
(2)
88
89
25
3.50
25
3.50
mA
A
A
2
s
mA
p
-
p
%
kHz
A
48S15.10HEW
48S24.6HEW
Units
V
V
dB
* Absolute Maximum Ratings. Caution: Stresses in excess of the Absolute Maximum Ratings can cause permanent damage to the device (see Note .)
240 Stanwell Drive, Concord Ca. 94520
Ph: 925-687-44
2
Fax: 925-687-3333
www.calex.com
Email: sales@calex.com
ECO# 050406-, 0806-, 00304-, 00726-2, 00923-
150 WATT HEW SINGLE SERIES
DC/DC CONVERTERS
Output Parameters
Model
Output Voltage
Output Voltage
Setpoint Accuracy
Turn On Overshoot Min-Max Load
Temperature Coefficient
Noise (8)
Load Current (4)
Load Transient Overshoot (7)
Load Transient Recovery Time (6)
Load Regulation (5)
Min-Max Load
Line Regulation
Vin = Min-Max
Overvoltage Protection (OVP)
Threshhold
OVP Type - Non-latching
Open Loop Overvoltage Clamp
Output Current Limit
Vout = 90% of Vout-nom
Output Short Circuit Current
Vout = 0.25V
MAX
TYP
TYP
MAX
TYP
TYP
MIN
MAX
TYP
TYP
TYP
MAX
TYP
MAX
MIN
MAX
TYP
TYP
MAX
0.005
0.0
75
20
3
30
0.003
0.005
75
20
3
30
24S3.30HEW
48S3.30HEW
3.3
24S5.30HEW
48S5.30HEW
5
24S12.12HEW
48S12.12HEW
2
±
0
0.003
0.005
50
60
.25
2.5
3
200
0.02
0.2
0.0
0.
5
35
20
40
50
0.003
0.005
50
60
0
0.003
0.005
250
00
0.626
6.26
24S15.10HEW
48S15.10HEW
5
24S24.6HEW
48S24.6HEW
24
Units
V
%
%
%/ºC
mV
p
-
p
mV
rms
A
%
µs
%
%
%
%
%
Notes:
(1) Refer to the CALEX Application Notes for the definition of terms,
measurement circuits, and other information.
(2) Refer to the CALEX Application Notes for information of fusing.
For inrush current, refer to the specifications above.
(3) 100µF capacitor connected between the two “Input” pins. Then
insert current sensor in series with 1.0µH inductor between
100µF and the source. The reflected ripple current is measured
over a 5 Hz to 20 MHz bandwidth. (current sensor is located
between the converter input pin and the 1.0 µH inductor)
(4) Optimum performance is obtained when this power supply is
operated within the minimum to maximum load specifications.
No damage to the module will occur when the output is operated
at less than minimum load, however, below minimum load the
dynamic response will degrade. Operation below minimum load
is not recommended.
(5) Load Regulation is defined as the output voltage change when
changing load current from a maximum to minimum.
(6) Load Transient Recovery Time is defined as the time for the
output to settle from a 50% to 75% step load change to a %
error band (rise time of step = 2µs).
(7) Load Transient Overshoot is defined as the peak overshoot
during a transient as defined in the Note 6 above.
(8) Noise is measured per the CALEX Application Notes. Output
noise is measured with a 10µF tantalum capacitor in parallel with
a 0.1µF ceramic capacitor connected across the output pins.
Measurement bandwidth is 0-20MHz.
(9) When an external ON/OFF switch is used, such as open collector
switch, logic high requires the switch to be high-impedance.
Switch leakage currents greater than 10µA may be sufficient to
trigger the ON/OFF to the logic-low state.
(0) Most switches would be suitable for the logic ON/OFF control. In
case there is a problem you can make the following estimations and
then leave some margin.
When open collector is used for logic high, “Open Circuit Voltage at
ON/OFF Pin”, “Output Resistance” and “External Leakage Current
Allowed for Logic High” are used to estimate the high impedance
requirement of open collector.
When switch is used for logic low, “Open Circuit Voltage at
ON/OFF Pin”, “Output Resistance” and “LOW Logic Level” are used
to estimate the low impedance requirement of the switch.
() Thermal impedance is tested with the converter mounted vertically
and facing another printed circuit board /2 inch away. If converter
is mounted horizontally with no obstruction, thermal impedance is
approximately 8°C/W.
(2) 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 specific manufacturing
process. Converters are not hermetically sealed.
(3) Torque fasteners into threaded mounting inserts at 2 in.lbs. or less.
Greater torque may result in damage to unit and void the warranty.
(4) Input impedance on these units needs to be kept to a minimum. The
9-36Vdc DC units need a maximum input impedance of 0.35 Ohms
and the 8-75Vdc DC units need a maximum input impedance of
0.54 Ohms. In order to support this requirement, the 9-36Vdc DC
units need 55 µF of capacitance (low ESR) for every 1.0 µH of
inductance between the power source and the DC/DC converter.
The 18-75Vdc DC units need 3.5µF of capacitance (low ESR) for
every 1.0 µH of inductance between the power source and the
DC/DC converter. Inductance includes all sources and should take
into account input power lines.
(5) RoHS Compliance:
See Calex Website www.calex.com/RoHS.html for the complete
RoHS Compliance statement.
The RoHS marking is as follows.
240 Stanwell Drive, Concord Ca. 94520
Ph: 925-687-44
3
Fax: 925-687-3333
www.calex.com
Email: sales@calex.com
ECO# 050406-, 0806-, 00304-, 00726-2, 00923-
150 WATT HEW SINGLE SERIES
DC/DC CONVERTERS
General Specifications
All Models
ON/OFF Function
HIGH Logic Level or
Leave ON/OFF Pin Open
External Leakage Current
Allowed for Logic High (9)
Input Diode Protection
Voltage
LOW Logic Level or
Tie ON/OFF Pin to -INPUT
Sinking Current for Logic
Low
Open Circuit Voltage at
ON/OFF Pin (0)
Positive Logic
Negative Logic
Output Resistance
Idle Current
(Module is OFF)
Turn-on Time to % error
Positive Logic Option
Negative Logic Option
Output Voltage Remote Sensing
Maximum Voltage Drops
on Leads
Line Regulation under
remote sensing
Load Regulation under
remote sensing
Output Voltage Trim
Trim Range
Input Resistance
Open Circuit Voltage
Trim Limit
Maximum Output Voltage
Isolation
Input to Output Isolation
10µA Leakage
Vnom = 24V
Vnom = 48V
Input to Output Resistance
Input to Output
Capacitance
MAX
MAX
MIN
TYP
700
544
0
600
VDC
VDC
MΩ
pF
2
3
4
5
6
7
8
9
-INPUT
CASE
ON/OFF
+INPUT
-OUTPUT
-SENSE
TRIM
+ SENSE
+ OUTPUT
MAX
0
% of Vout
MIN
MAX
TYP
TYP
-0
+0
0
2.5
% of Vout
kΩ
V
TOLERANCE: ALL DIMENSIONS ARE TYPICAL IN
INCHES UNLESS OTHERWISE NOTED:
X.XX
X.XXX
±0.020
±0.005
General Specifications
Units
All Models
Environmental
MIN
MAX
MAX
MAX
MAX
3.0
0
50
.0
500
VDC
µA
VDC
VDC
µA
Calculated MTBF, Bellcore
Method , Case
Baseplate Operating
Temperature Range
Storage Temperature
Thermal Impedance ()
Thermal Shutdown
Baseplate
Temperature (Auto Restart)
General
TYP
TYP
TYP
TYP
TYP
2.3
.5
3
8
60
HIGH - Module ON
LOW - Module OFF
HIGH - Module OFF
LOW - Module ON
VDC
VDC
kΩ
mADC
ms
Unit Weight
Case Dimension
Torque on Mounting Inserts
Agency Approvals
UL
Chassis Mounting Kit
IEC 60950-, EN60950-
MS2
MAX
TYP
4.6/4
2 in. lbs.
oz/g
2.4” x 2.28” x 0.55”
>,000,000
MIN
MAX
MIN
MAX
TYP
MIN
TYP
-40
00
-40
20
7
00
0
h
ºC
ºC
ºC/W
ºC
Units
MAX
TYP
MAX
TYP
MAX
0
0.02
0.
0.05
0.2
%
%
%
Pin
Name
24Vin
Pin Dia.
0.08”
0.04”
0.04”
0.08”
0.08”
0.04”
0.04”
0.04”
0.08”
48Vin
Pin Dia.
0.04”
0.04”
0.04”
0.04”
0.08”
0.04”
0.04”
0.04”
0.08”
240 Stanwell Drive, Concord Ca. 94520
Ph: 925-687-44
4
Fax: 925-687-3333
www.calex.com
Email: sales@calex.com
ECO# 050406-, 0806-, 00304-, 00726-2, 00923-
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