Copyright © Calex Mfg. Co. Inc All Rights Reserved
2401 Stanwell Drive, Concord Ca. 94520,
Ph: 925-687-4411, Fax: 925-687-3333,
www.calex.com Email: sales@calex.com
Page 1 of 17
500 WATT MXW SERIES
DC/DC CONVERTER
ECO 171121-1, 181204-1
· 4:1 Input voltage range
· High power density
· Small size 2.4” x 2.5” x 0.52”
· Efficiency up to 95.7%
· Excellent thermal performance
· Metal Baseplate
· Over-Current and Short Circuit Protection
· Over-Temperature protection
· Auto-restart
· Monotonic startup into pre-bias
· Constant frequency
· Remote ON/OFF
· Good shock and vibration damping
· Temperature Range -40ºC to +105ºC Available
· RoHS Compliant
· UL60950 Approved
· 5 Year Warranty
Product Overview
The 4:1 Input Voltage 500 Watt Single MXW 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 500 Watt
MXW meets the most rigorous performance standards
in an industry standard footprint for mobile (12V
IN
),
process control (24V
IN
), and military COTS (28V
IN
)
applications.
The 4:1 Input Voltage 500 Watt MXW includes trim and
remote ON/OFF. Threaded through holes are provided
to allow easy mounting or addition of a heatsink for
extended temperature operation. (Non-threaded option
is available, see ordering information under model
selection table.)
The converters high efficiency and high power density
are accomplished through use of high-efficiency
synchronous rectification technology, advanced
electronic circuit, packaging and thermal design thus
resulting in a high reliability product. Converter
operates at a fixed frequency and follows conservative
component de-rating guidelines.
Model
Input Range
VDC
Vout
VDC
Iout
ADC
Min Max
24S12.41MXW (ROHS) 9 36 12 41
24S24.21MXW (ROHS) 9 36 24 21
24S28.18MXW (ROHS) 9 36 28 18
1. Negative Logic On/Off feature is available. Add “-N” to the
part number when ordering.
i.e. 24S12.41MXW-N (ROHS)
2. Available with non-threaded mounting inserts. Add –I to the
part number when ordering.
i.e 24S28.18MXW-I (ROHS)
3. Designed to meet MIL-STD-810G for functional shock and
vibration. The unit must be properly secured to the interface
medium (PCB/Chassis) by use of the threaded inserts of the
unit.
4. A thermal management device, such as a heatsink, is
required to ensure proper operation of this device. The thermal
management medium is required to maintain baseplate < 105ºC
for full rated power.
5. Non-standard output voltages are available. Please contact
the factory for additional information.
Copyright © Calex Mfg. Co. Inc All Rights Reserved
2401 Stanwell Drive, Concord Ca. 94520,
Ph: 925-687-4411, Fax: 925-687-3333,
www.calex.com Email: sales@calex.com
Page 2 of 17
500 WATT MXW SERIES
DC/DC CONVERTER
ECO 171121-1, 181204-1
Electrical Specifications:
Conditions: T
A
= 25ºC, airflow = 300 LFM (1.5m/s), V
IN
= 24VDC, unless otherwise specified. Specifications subject to change
without notice.
All Models
Parameter Notes Min Typ Max Units
Absolute Maximum Ratings
Input Voltage Continuous 0 40 V
Transient (100ms) 50 V
Operating Temperature Baseplate (100% load) -40 105 ºC
Storage Temperature -55 125 ºC
Isolation Characteristics and Safety
Isolation Voltage Input to Output 2250 V
Input to Baseplate & Output to Baseplate 1500 V
Isolation Capacitance 4500 pF
Isolation Resistance 10 20 MΩ
Insulation Safety Rating Basic
Designed to meet UL/cUL 60950, IEC/EN 60950-1
Feature Characteristics
Fixed Switching Frequency Output Voltage Ripple has twice this frequency 200 kHz
Output Voltage Trim Range ±10 %
Remote Sense Compensation This function is not provided N/A %
Output Overvoltage Protection Non-latching 117 124 130 %
Over Temperature Shutdown (Baseplate) Non-latching 110 120 ºC
Auto-Restart Period Applies to all protection features 450 500 550 ms
Turn-On Time from V
IN
Time from UVLO to
V
O
=90% V
OUT
(NOM) Resistive load
517 530 ms
Turn-On time from ON/OFF Control Trim from ON to
V
O
=90% V
OUT
(NOM) Resistive load
17 20 ms
Rise Time VOUT from 10% to 90% 4 7.5 11 ms
ON/OFF Control – Positive Logic
On State Pin open = ON or external voltage applied 2 12 V
Current Control Leakage current 0.16 mA
OFF State 0 0.8 V
Control Current Sinking 0.3 0.36 mA
ON/OFF Control – Negative Logic
ON State Pin shorted to –INPUT or 0.8 V
OFF State Pin open = OFF or 2 12 V
Thermal Characteristics
Thermal resistance Baseplate to Ambient Converter soldered to 3.95” x 2.5” x 0.07” 4
layer / 2oz copper FR4 PCB
5.2 ºC/W