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31 Watt Quad Output DC/DC Converter
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
12/09/03, eco# 041007-1, 05/02/05
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1
Unless otherwise stated, these specifications apply for
T
A
=25C, V
in
=V
nom,
and maximum rated load [1].
A
31 Watt Quad Output DC/DC Converter
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
12/09/03, eco# 041007-1, 05/02/05
Notes
(1)
Test conditions, unless noted: Tamb=+25C, Vin = 75VDC, and
Maximum Load. No connection to the Trim pin or the ON/OFF
pin (both left open).
(2)
Output noise is measured with a 10uF 25V tantalum capacitor
in parallel with a 0.1uF ceramic capacitor connected from each
positive output to its respective negative output pins.
Measurement bandwidth is 0-20 MHz for peak to peak, and
10kHz to 1MHz for RMS. Input Reflected Ripple current is
measured into a 2H source.
(3)
External fusing should be used for system protection due to a
catastrophic failure.
(4)
Capacitance is total from input to all outputs tied together.
The case is electrically floating. Isolation is tested with no
external connection to the case.
(5)
Case thermal impedance is defined as the case temperature
rise above ambient per package watt dissipated.
(6)
Load regulation is defined as the change in output voltage due
to a load change as indicated, referenced from Typical Load.
Load currents on both outputs are equal and simultaneously
changed.
(7)
Cross regulation is defined as the change in one output due to
a load change in the adjacent output of the same PWM system.
Starting condition is both outputs at Typical Load. The output
being measured is maintained at Typical Load, while the other
load is changed over the range shown.
(8)
Temperature coefficient is defined for case temperatures. Output
voltage deviation is calculated as the maximum resulting from
either A) 25 C case to maximum operating case temperature,
or B) 25 C case to minimum operating case temperature.
(9)
Transient Response is defined as the time for the output to settle
to within a 1% error band due to the step load change indicated.
All of the other outputs are at Typical load. Dynamic response
is defined as the peak overshoot during the transient.
(10) 4,000F is the total on the Vo1 and Vo4 outputs combined.
680F is the total on the Vo2 and Vo3 outputs combined.
(11) 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.
(12) No harm to the unit when operated at No Load. Output voltage
at No Load may be significantly lower that the typical/nominal
value.
SR Quad Block Diagram
A
31 Watt Quad Output DC/DC Converter
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
12/09/03, eco# 041007-1, 05/02/05
Application Notes
Output Paralleling and Series Connection
The outputs are isolated from the input and from each other,
which allows connecting the outputs in any series combination
to obtain higher voltages.
Any output with the same nominal output voltage rating can be
paralleled together for a higher output current capability. The
user must keep the parallel wire connections short and each
must be less than 50 milliohms resistance for the high side
and return lines in order to maintain the current balance
between the paralleled outputs. Do not parallel a 12V output
with a 5.1V output.
Output Overcurrent Limiting
Output overcurrent is sensed on the primary side at each
PWM section. An overcurrent in either PWM section will
cause both PWM sections to shutdown and go into a hic-cup
mode, where they will try to automatically re-start.
5
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5
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2
5
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Trim
The Trim function simultaneously only changes the 5V outputs
(Vo1 and Vo4). Default is to leave the pin open. A resistor
from the Trim pin to Vin will increase both 5V outputs at the
same time.
Load Current Capability at Start-up
The Test circuit is shown below. est the +5.1V with a DC load
of 2A, and the 12V with a DC load of 600mA on each output.
The SR quad has sufficient output current capability to start
with the loads shown. Typical rise time is 8ms.
Adding External Inductance
Adding external inductance Lext as shown below will require
the addition of Cext. Use the formula Cext >= (Lext/6).
i.e. adding 20H will require Cext to be 3.3F or greater. For
a common mode inductor use it's differential inductance
value.
Adding External Inductance
Load Current Capability at Start-up
A
31 Watt Quad Output DC/DC Converter
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
12/09/03, eco# 041007-1, 05/02/05
Mechanical tolerances unless otherwise noted:
X.XX dimensions: 0.020 inches
X.XXX dimensions: 0.005 inches
Pin location shown is for mating PCB.
The case is aluminum, black.
The outer surface of the header is non-conductive.
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