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 12
24S12.84FXA
DC/DC CONVERTER
1/16/19
PRELIMINARY
●
4:1 Input voltage range
●
High power density
● Small size 2.5” x 4.7” x 0.52”
●
Efficiency up to 95.4%
●
Excellent thermal performance with metal
baseplate
●
Over-Current and Short Circuit Protection
●
Over-Temperature protection
●
Auto-restart
●
Monotonic startup into pre bias
●
Constant frequency
●
Remote ON/OFF
●
Encapsulated
●
Good shock and vibration damping
●
RoHS Compliant
●
5 Year Warranty
Product Overview
The 4:1 Input Voltage 1000 Watt Single output
24S12.84FXA 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 24S12.84FXA meets the most
rigorous performance and is optimized for 12V
battery applications but can also be used in 24Vin
process control and 28Vin military COTS
applications.
The 4:1 Input Voltage 24S12.84FXA
includes output
current monitor (Imon) and temperature monitor
(TEMP) signals. Threaded through holes are
provided to allow easy mounting or addition of a
heatsink for extended temperature operation.
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
24S12.84FXA (ROHS) 9 36 12 84
1. Negative Logic ON/OFF feature available. Add “-N” to the
part number when ordering.
i.e. 24S12.84FXA-N (ROHS)
2. 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.
3. 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.
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 12
24S12.84FXA
DC/DC CONVERTER
1/16/19
PRELIMINARY
Electrical Specifications
Conditions:
T
A
= 25 ºC, Airflow = 300 LFM (1.5 m/s), Vin = 14VDC, unless otherwise specified. Specifications are subject to
change without notice.
Notes
Min
Typ
Max
Units
Absolute Maximum Ratings
Continuous
0
40
V
Transient (100ms)
50 V
Baseplate (100% load)
-40
105
°C
Storage Temperature
-55
125 °C
Input to Output
2250
V
Input to Baseplate & Output to Baseplate 1500
V
Isolation Capacitance
9000
pF
Isolation Resistance
10
20
MΩ
Insulation Safety Rating
Basic
Designed to meet UL/cUL 60950, IEC/EN 60950-1
200
kHz
Input Current and Output Voltage Ripple
400
kHz
Output Current Monitor - Imon
Voltage proportional to output current
22
mV/A
Accuracy
+/- 2
%
TEMP monitor
MCP9700A used for sensing PCB
temperature of the converter. Voltage range
for temperature range -40°C to 125 °C .
0.1
1.75
V
Non-latching
114
119
130
%
Overtemperature Shutdown (Baseplate)
Non-latching
108
112
120
°C
Auto-Restart Period
Applies to all protection features
1.7
2
2.3
s
Turn-On Time from Vin
Time from UVLO to
Vo=90%V
OUT
(NOM)
Resistive load
480 517 530 ms
Turn-On Time from ON/OFF Control
Time from ON to
Vo=90%V
OUT
(NOM)
Resistive load
15
22
30
ms
Vout from 10% to 90%
4
7.5
11
ms
ON/OFF Control – Positive Logic
Pin open = ON or
2
12 V
Leakage current
0.16 mA
0
0.8
V
Sinking
0.3
0.36 mA
Pin shorted to – ON/OFF pin or
0
0.8
V
Pin open = OFF or
2
12 V
Thermal resistance Baseplate to Ambient
Converter soldered to 5” x 3.5” x 0.07”,
4 layer/2Oz copper FR4 PCB.
2.6 °C/W