75 Watt HEW Single Series DC/DC Converters
Features
4:1 input voltage range
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
Description Remote ON/OFF
The 4:1 Input Voltage 75 W single HEW Series of DC/DC Super energy saving, 2 mA input idle current
converters provide precisely regulated dc outputs. The output
voltage is fully isolated from the input, allowing the output to Output trim with very low temperature coefficient
be positive or negative polarity and with various ground Water Washable, wide humidity applications
connections. The HEW Series meets the most rigorous
performance standards in an industry standard case size for Good shock & vibration damping
data communications and process control applications.
The 4:1 Input Voltage 75 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
Input Range I in
VD C ADC V out I out
Model
VD C ADC
Min Max Typ
24S3.20HEW 9 36 3.36 3.3 20
24S5.15HEW 9 36 3.68 5 15
24S12.6HEW 9 36 3.63 12 6.25
24S15.5HEW 9 36 3.59 15 5 A
24S24.3HEW 9 36 3.59 24 3.125
48S3.20HEW 18 75 1.66 3.3 20
48S5.15HEW 18 75 1.82 5 15
48S12.6HEW 18 75 1.80 12 6.25
48S15.5HEW 18 75 1.78 15 5
48S24.3HEW 18 75 1.78 24 3.125
Default ON/OFF logic is positive.
Add -N to the model number to order negative ON/OFF logic.
CompuMess Elektronik GmbH · Lise-Meitner-Str.1 · 85716 Unterschleissheim
Tel 089-321501-0 · Fax 089-321501-11 · www.compumess.de · www.netzteile.de
1
75 Watt HEW Single Series DC/DC Converters
Unless otherwise stated, these specifications apply for ambient temperature TA=23 ±2°C, nominal input voltage, and rated full load. (1)
Input Parameters
Model 24S3.20HEW 24S5.15HEW 24S12.6HEW 24S15.5HEW 24S24.3HEW Units
MIN 9
Voltage Range TYP 24 VD C
MAX 36
Input Overvoltage
MAX 50 VD C
100 mSec
Input Ripple Rejection
TYP 60 dB
(120Hz)
Undervoltage Lockout Yes
Input Reverse Voltage Protection Yes
Input Current No Load TYP 12 12 12 12 12 mA
100% Load TYP 3.36 3.68 3.63 3.59 3.59 A
Inrush Current MAX 0.5 A2 S
Reflected Ripple, 12µH
TYP 30 mA P-P
Source Impedance (3)
Efficiency TYP 82 85 86 87 87 %
Switching Frequency TYP 325 kHz
Recommended Fuse (2) AMPS
Input Parameters
Model 48S3.20HEW 48S5.15HEW 48S12.6HEW 48S15.5HEW 48S24.3HEW Units
MIN 18
Voltage Range TYP 48 VD C
MAX 75
Input Overvoltage
MAX 80 VD C
100 mSec
Input Ripple Rejection
TYP 60 dB
(120Hz)
Undervoltage Lockout Yes
Input Reverse Voltage Protection Yes
Input Current No Load TYP 12 12 12 12 12 mA
100% Load TYP 1.66 1.82 1.80 1.78 1.78 A
Inrush Current MAX 0.5 A2 S
Reflected Ripple, 12µH
TYP 30 mA P-P
Source Impedance (3)
Efficiency TYP 83 86 87 88 88 %
Switching Frequency TYP 325 kHz
Recommended Fuse (2) AMPS
* Absolute Maximum Ratings. Caution: Stresses in excess of the Absolute Maximum Ratings can cause permanent damage to the device (see Note 1).
CompuMess Elektronik GmbH · Lise-Meitner-Str.1 · 85716 Unterschleissheim
Tel 089-321501-0 · Fax 089-321501-11 · www.compumess.de · www.netzteile.de
2
75 Watt HEW Single Series DC/DC Converters
Unless otherwise stated, these specifications apply for ambient temperature TA=23 ±2°C, nominal input voltage, and rated full load. (1)
Output Parameters
24S3.20HEW 24S5.15HEW 24S12.6HEW 24S15.5HEW 24S24.3HEW
Model 48S3.20HEW 48S5.15HEW
Units
48S12.6HEW 48S15.5HEW 48S24.3HEW
Output Voltage 3.3 5 12 15 24 VDC
Turn On Overshoot TYP 0 %
TYP 0.005 0.003
Temperature Coefficient %/°C
MAX 0.01 0.005
TYP 75 75 150 150 250 mV P-P
Noise (8)
TYP 20 20 60 60 100 mV RMS
Load Current (4) TYP 20 15 6.25 6.5 3.125 ADC
Load Transient Overshoot (7) TYP 3 %
Load Transient Recovery Time (6) TYP 200 µSec
Load Regulation (5) TYP 0.02
%
Min-Max Load MAX 0.2
Line Regulation TYP 0.01
%
Vin = Min-Max MAX 0.1
Overvoltage Protection (OVP)
Threshhold MIN 115
%
OVP Type - Non-latching MAX 135
Open Loop Overvoltage Clamp
Output Current Limit
TYP 120 %
V out=90% of V out-nom
Output Short Circuit Current TYP 140
%
V out = 0.25 V MAX 150
NOTES:
(9) When an external On/Off switch is used, such as open collector
(1) Refer to the CALEX Application Notes for the definition of terms, switch, logic high requires the switch to be high-impedance.
measurement circuits, and other information. Switch leakage currents greater than 10 µA may be sufficient to
(2) Refer to the CALEX Application Notes for information on fusing. trigger the On/Off to the logic-low state.
For inrush current, refer to the specifications above. (10) Most switches would be suitable for logic On/Off control. In case
(3) 33 µF capacitor connected to two "Input" pins. Then place there is a problem, you can make following estimations and then
current sensor in series with 12 µH inductor between 33 µF and leave some margin.
the source. The reflected ripple current is measured over a 5 Hz When open collector is used for logic high, "Open Circuit Voltage
to 20 MHz bandwidth.(current sensor is located between the at On/Off Pin", "Output Resistance" and "External Leakage
converter input pin and the 12 uH inductor) Current Allowed for Logic High" are used to estimate the high
(4) Optimum performance is obtained when this power supply is impedance requirement of open collector.
operated within the minimum to maximum load specifications. When switch is used for logic low, "Open Circuit Voltage at On/
No damage to the module will occur when the output is operated Off Pin", "Output Resistance" and "LOW Logic Level" are used
at less than minimum load, however the output voltage may
contain a low frequency component that may exceed output
noise specifications.
A
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
(5) Load regulation is defined as the output voltage change when converter is mounted horizontally with no obstructions, thermal
changing load current from maximum to minimum. impedance is approximately 8 °C/W.
(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 = 2µSec).
(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 0.1 µF ceramic capacitor connected across the output to CMN.
Measurement bandwidth is 0-20 MHz.
CompuMess Elektronik GmbH · Lise-Meitner-Str.1 · 85716 Unterschleissheim
Tel 089-321501-0 · Fax 089-321501-11 · www.compumess.de · www.netzteile.de
3
75 Watt HEW Single Series DC/DC Converters
Mounting inserts
General Specifications 2.28 M3 x 0.5 though
4 places
All Models Units 1.90
0.080Ø
1.400 1 5 1.400
Remote ON/OFF Function
1.000 2 6 1.000
HIGH Logic Level
MAX 3.0 VD C
2.40
2.00
or Leave ON/OFF Open 7 0.700
External Leakage Current 0.400 3 8 0.400
MAX 10 µA
Allowed for Logic High (9) 4 0.000
0.000 9 0.040Ø
Input Diode Protection
MAX 50 VD C
Voltage 0.50
LOW Logic Level
MIN 1.0 VD C
0.2 TYP
0.000
0.55
1.900
2.09
0.19
0.000
or Tie ON/OFF Pin to -Input
Sinking Current for
MAX 500 µA
Logi c Low
BOTTOM VIEW SIDE VIEW
Open Circuit Voltage at
On/Off Pin (10)
Positive Logic TYP 2.3 VD C
Negative Logic TYP 1.5 VD C
Output Resistance (10) TYP 3 k Ohm
Idle Current 9-36 VDC 18-75 VDC
TYP 2 mADC Pin Function
(Module is OFF) pin dia. pin dia.
Turn-on Time to 1% error TYP 20 mSec
1 - INPUT 0.08" 0.04"
HIGH - Module ON
Positive Logic Option
LOW - Module OFF 2 C ASE 0.04" 0.04"
HIGH - Module OFF 3 ON/OFF 0.04" 0.04"
Negative Logic Option
LOW - Module ON
4 +INPUT 0.08" 0.04"
Output Voltage Remote Sensing
5 - OUTPUT 0.08" 0.08"
Maximum Voltage Drops
MAX 0.5 VD C 6 - SENSE 0.04" 0.04"
on Leads
Line Regulation TYP 0.02 7 TRIM 0.04" 0.04"
%
under remote sensing MAX 0.1
Load Regulation TYP 0.05 8 +SENSE 0.04" 0.04"
%
under remote sensing MAX 0.2
9 +OUTPUT 0.08" 0.08"
Output Voltage Trim
MIN -10 % of
Trim Range
MAX +10 Vout
Input Resistance TYP 10 k Ohm
Open Circuit Voltage TYP 2.5 V
Trim Limit
% of
Maximum Output Voltage MAX 110
Vout
Isolation
Input to Output Isolation 10µA
L e a ka g e
Vnom = 24V MAX 700 VD C
Vnom = 48V MAX 1544 VD C
Input to Output Resistance MIN 10 Mohm
Input to Output Capacitance TYP 1800 pF
Environmental
Baseplate Operating MIN -40
°C
Temperature Range MAX 100
MIN -40
Storage Temperature °C
MAX 120
Thermal Impedance (11) TYP 7 °C/W
Thermal Shutdown Baseplate MIN 100
°C
Temperature (Auto Restart) TYP 110
General
Unit Weight TYP 4.6/114 oz/g
Case Dimension 2.4" x 2.28" x 0.55"
Agency Approvals
Pending for UL60950,
UL, TUV
EN60950 (TUV)
CompuMess Elektronik GmbH · Lise-Meitner-Str.1 · 85716 Unterschleissheim
Tel 089-321501-0 · Fax 089-321501-11 · www.compumess.de · www.netzteile.de
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