A
75 Watt LT Triple 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
11/18/04, eco#: 041007-1, 050606-1, 050503-1, 050713-2, 060615-3
Description
The LT Triple Series DC/DC family provides three independent
and precisely regulated low output voltage converters in one
package reducing cost and saving board space. The LT
Series meets rigorous requirements in an industry standard
brick package, and is well suited for telecom and industrial
applications.
All three outputs are rated for a maximum of 10 Amps, thus
providing many possible output load combinations with a total
output power of 75 Watts. The remote trim function on each
output can be used to compensate for voltage drops between
the converter and the load at higher currents.
The LT Series includes a primary remote on/off for power
conservation. The LT package features threaded-through
holes to allow for easy mounting or the addition of a heat sink
for extended temperature operation.
*Add (-N) to the end of the part number for negative logic on the
primary shutdown. Default ON/OFF logic is positive.
** The output currents are the maximum ratings of each of the
outputs. It is up to the user to keep the total power output at or below
the 75 Watt rating of the package.
Features
Small size 2.4" x 2.28" x 0.55"
Excellent thermal performance with metal baseplate
Non-latching over voltage shutdown
Pulse-by-pulse current limiting,
short circuit foldback
Over-temperature protection
Auto-softstart
Low noise
Constant frequency for normal operation.
2:1 input voltage range
Positive logic primary remote ON/OFF
Negative logic primary shutdown as an option
Very low temperature coefficient
Water Washable
Trimmable output voltages
Low cost
5 Year Warranty
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A
75 Watt LT Triple 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
11/18/04, eco#: 041007-1, 050606-1, 050503-1, 050713-2, 060615-3
Unless otherwise stated, these specifications apply for ambient temperature T
A
=23 2C, nominal input voltage, and full load. (1) (2)
NOTES:
(1)
Refer to the CALEX Application Notes for the definition of terms,
measurement circuits, and other information.
(2)
Full Load is defined as the main output operating at 10 Amps.
The auxiliary outputs are equally loaded to bring output power to
75 Watts, or loaded to 10 Amps maximum on each.
(3)
This unit is not fused and needs to be fused by the user. Refer
to the CALEX Application Notes for information on fusing. For
inrush current, refer to the specifications above.
(4)
Place a 33 uF capacitor between the two "Input" pins. Then place
the current sensor in series with a 12 H inductor between the
capacitor and the source. The reflected ripple current is measured
over a 5 Hz to 20 MHz bandwidth. Noise should be minimized in
the measurement.
(5)
Noise is measured per the CALEX Application Notes. Output
noise is measured with a 10 F tantalum capacitor in parallel
with a 0.1 F ceramic capacitor connected across the output to
CMN. Measurement bandwidth is 0-20 MHz.
(6)
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, but the output voltage may contain
a low frequency component that may exceed output noise
specifications. At no load the converter's Vo1 output voltage
may fall out of regulation, typically rising to the OVP limit. A load
current of between 0.5% to 1% of maximum rated load on any
of the outputs will usually suffice to bring Vo1 within regulation.
(7)
Load Transient Recovery Time is defined as the time for the
output to settle from a 50 to 75% or 25% step load change to a
1% error band of output voltage(rise time of step = 2Sec).
(8)
Load Transient Overshoot is defined as the peak overshoot
during a transient as defined in the Note 7 above.
(9)
Load regulation is defined as the output voltage change when
changing load current from maximum to minimum. The voltage
is measured at the output pin.
(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.
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A
75 Watt LT Triple 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
11/18/04, eco#: 041007-1, 050606-1, 050503-1, 050713-2, 060615-3
Unless otherwise stated, these specifications apply for ambient temperature T
A
=23 2C, nominal input voltage, and full load. (1) (2)
(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 7 C/W.
(12) Minimum load is defined as 10% of maximum load. Calex Mfg.
Co. Inc. does not guarantee performance for loads less than the
minimum. Loads less than the minimum shall not damage the
unit.
(13) The unit can be configured with negative logic for Remote ON/
OFF.
(14) 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 uA may be sufficient to
trigger the ON/Off to the logic-low state.
(15) 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.
(16) Torque fasteners into threaded mounting inserts at 12 in. oz. or
less. Greater torque may result in damage to unit and void the
warranty.
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75 Watt LT Triple 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
11/18/04, eco#: 041007-1, 050606-1, 050503-1, 050713-2, 060615-3
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Mechanical tolerances unless otherwise noted:
X.XX dimensions: 0.020 inches
X.XXX dimensions: 0.005 inches
PDF 
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