A
150 Watt HEW Single Series DC/DC Converters
2401 Stanwell Drive Concord, California 94520 Ph: 925/687-4411 or 800/542-3355 Fax: 925/687-3333 www.calex.com Email: sales@calex.com
1
ECO # 050713-2, 050726-1, 060306-5, 060406-1.
Description
The 4:1 Input Voltage 150 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 an industry standard case size for
data communications and process control applications.
The 4:1 Input Voltage 150 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.
Features
4:1 input voltage range
High power density
Small size 2.4"x2.28"x0.55"
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 for normal operation
Remote Sense
Remote ON/OFF
Super energy saving, 2 mA input idle current
Output trim with very low temperature coefficient
Water Washable, wide humidity applications
Good shock & vibration damping
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Default ON/OFF logic is positive.
Add -N to the model number to order negative ON/OFF logic.
A
150 Watt HEW Single Series DC/DC Converters
2401 Stanwell Drive Concord, California 94520 Ph: 925/687-4411 or 800/542-3355 Fax: 925/687-3333 www.calex.com Email: sales@calex.com
2
ECO # 050713-2, 050726-1, 060306-5, 060406-1.
Unless otherwise stated, these specifications apply for ambient temperature T
A
=23 2C, nominal input voltage, and rated full load. (1)
* Absolute Maximum Ratings. Caution: Stresses in excess of the Absolute Maximum Ratings can cause permanent damage to the device (see Note 1).
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150 Watt HEW Single Series DC/DC Converters
2401 Stanwell Drive Concord, California 94520 Ph: 925/687-4411 or 800/542-3355 Fax: 925/687-3333 www.calex.com Email: sales@calex.com
3
ECO # 050713-2, 050726-1, 060306-5, 060406-1.
Unless otherwise stated, these specifications apply for ambient temperature T
A
=23 2C, nominal input voltage, and rated full load. (1)
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 on fusing.
For inrush current, refer to the specifications above.
(3)
100 F capacitor connected to two "Input" pins. Then place
current sensor in series with 1.0 H inductor between 100 F 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 uH 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 the output voltage may
contain a low frequency component that may exceed output
noise specifications.
(5)
Load regulation is defined as the output voltage change when
changing load current from 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 1% error
band (rise time of step = 2Sec).
(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 10F tantalum capacitor in parallel with
a 0.1 F ceramic capacitor connected across the output to CMN.
Measurement bandwidth is 0-20 MHz.
(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 10 A may be sufficient to
trigger the On/Off to the logic-low state.
(10) Most switches would be suitable for logic On/Off control. In case
there is a problem, you can make 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 switch.
(11) Thermal impedance is tested with the converter mounted vertically
and facing another printed circuit board 1/2 inch away. If
converter is mounted horizontally with no obstructions, thermal
impedance is approximately 8 C/W.
(12) 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.
(13) Torque fasteners into threaded mounting inserts at 12 in. oz. or
less. Greater torque may result in damage to unit and void the
warranty.
(14) Input impedance on these units needs to be kept to a minimum.
The 9-36Vdc DC units need a maximum input impedance of
0.135 Ohms and the 18-75Vdc DC units need a maximum input
impedance of 0.54 Ohms. In order to support this requirement,
the 9-36Vdc DC units need 55 uFarads of capacitance (low
ESR) for every 1.0 uHenry of inductance between the power
source and the DC-DC converter. The 18-75Vdc DC units need
3.5 uFarads of capacitance (low ESR) for every 1.0 uHenry of
inductance between the power source and the DC-DC converter.
Inductance includes all sources and should take into account
input power lines.
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A
150 Watt HEW Single Series DC/DC Converters
2401 Stanwell Drive Concord, California 94520 Ph: 925/687-4411 or 800/542-3355 Fax: 925/687-3333 www.calex.com Email: sales@calex.com
4
ECO # 050713-2, 050726-1, 060306-5, 060406-1.
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Mechanical tolerances unless otherwise noted:
X.XX dimensions: 0.020 inches
X.XXX dimensions: 0.005 inches
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