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SQL48T20033 DC-DC Converter Data Sheet
36-75 VDC Input; 3.3 VDC @ 20A Output
Environment and Mechanical Specifications
Environmental
Operating Humidity
Storage Humidity
RH (Non-condensing)
RH (Non-condensing)
95
95
%
%
Mechanical
Weight
No Baseplate
With Baseplate
21.4
32.9
g
g
Reliability
MTBF
Telcordia SR-332, Method I Case 1
50% electrical stress, 40°C components
~23.6
MHrs
EMI and Regulatory Compliance
Conducted Emissions
Safely Agency Approvals
Operations
Input and Output Impedance
These power converters have been designed to be
stable with no external capacitors when used in low
inductance input and output circuits.
In many applications, the inductance associated with
the distribution from the power source to the input of
the converter can affect the stability of the converter.
The addition of a 33 μF electrolytic capacitor with an
ESR <1 Ω across the input helps to e nsure stability
of the converter. In applications where decoupling
capacitance is distributed at the load, the power
converter will exhibit stable operation with up to the
maximum admissible external load capacitance up to
10,000 μF and ESR > 1mΩ .
ON/OFF (Pin 2)
The ON/OFF pin is used to turn the power converter
on or off remotely via a system signal. There are two
remote control options available, positive and
negative logic, with both referenced to Vin(-). A
CISPR 22 B with external EMI filter network
UL60950-1/CSA60950-1, EN60950-1 and IEC60950-1
The positive logic version turns on when the ON/OFF
pin is at logic high and turns off when at logic low. The
converter is on when the ON/OFF pin is left open. See
the Electrical Specifications for logic high/low
definitions.
The negative logic version turns on when the pin is at
logic low and turns off when the pin is at logic high.
The ON/OFF pin can be hard wired directly to Vin(-) to
enable automatic power up of the converter without the
need of an external control signal.
The ON/OFF pin is internally pulled up to 5 VDC
through a resistor. A properly de-bounced mechanical
switch, open-collector transistor, or FET can be used
to drive the input of the ON/OFF pin. The device must
be capable of sinking up to 0.2 mA at a low level
voltage of ≤ 0.8 V. An external voltage source (±20 V
maximum) may be connected directly to the ON/OFF
input, in which case it must be capable of sourcing or
sinking up to 1 mA depending on the signal polarity.
See the Startup Information section for system timing
waveforms associated with use of the ON/OFF pin.
typical connection is shown in Fig. A.
Remote Sense
Vin (+)
SQL 48 Converter Vout (+)
The
remote sense feature of the converter
(Top View)
SENSE (+)
compensates for voltage drops occurring between the
Vin
ON/OFF
TRIM
Rload
output pins of the converter and the load. The
SENSE (-)
SENSE(-) (Pin 5) and SENSE(+) ( Pin 7) pins should
CONTROL
INPUT
Vin (-)
Vout (-)
be connected at the load or at the point where
regulation is required (see Fig. B). When using remote
Fig. A: Typ. Circuit configuration for ON/OFF function.
sense a minimum of 100uF ceramic capacitance
should be mounted between Vout(+) and Vout(-) close
to the pin 8 and pin 4.
Rev 0.2, 3-Mar-11
www.power-one.com
Page 4 of 14
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