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SQE48T40018 DC-DC Converter
36-75 VDC Input; 1.8 VDC @ 40 A Output
Data Sheet
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.
However, in some applications, the inductance
associated with the distribution from the power
source to the input of the converter can affect the
stability of the converter. A 33 μF electrolytic
capacitor with an ESR < 1 ? across the input is
recommended to ensure stability of the converter
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.
Remote Sense (Pins 5 and 7)
The remote sense feature of the converter
compensates for voltage drops occurring between
the output pins of the converter and the load. The
SENSE(-) (Pin 5) and SENSE(+) (Pin 7) pins should
be connected at the load or at the point where
regulation is required (see Fig. B).
over the wide range of input source impedance.
In many applications, the user has to use decoupling
capacitance at the load. The power converter will
exhibit stable operation with external load
capacitance up to 20,000 μF.
ON/OFF (Pin 2)
Vin
Vin (+)
ON/OFF
Vin (-)
SQE48 Converter
Vout (+)
(Top View) 100
SENSE (+)
TRIM
SENSE (-)
10
Vout (-)
Rw
Rw
Rload
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
typical connection is shown in Fig. A.
Fig. B: Remote sense circuit configuration.
CAUTION
If remote sensing is not utilized, the SENSE(-) pin must be
connected to the Vout(-) pin (Pin 4), and the SENSE(+) pin
must be connected to the Vout(+) pin (Pin 8) to ensure the
converter will regulate at the specified output voltage. If these
Vin (+)
SQE48 Converter
(Top View)
Vout (+)
SENSE (+)
connections are not made, the converter will deliver an
output voltage that is higher than the specified data sheet
value.
Vin
CONTROL
INPUT
ON/OFF
Vin (-)
TRIM
SENSE (-)
Vout (-)
Rload
Because the sense leads carry minimal current,
large traces on the end-user board are not required.
However, sense traces should be run side by side
and located close to a ground plane to minimize
Fig. A: Circuit configuration for ON/OFF function.
The positive logic version turns on when the ON/OFF
pin is at a logic high and turns off when the pin is at a
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 a logic low and turns off when the pin is at a 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 V
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
system noise and ensure optimum performance.
The converter’s output overvoltage protection (OVP)
senses the voltage across Vout(+) and Vout(-), and
not across the sense lines, so the resistance (and
resulting voltage drop) between the output pins of
the converter and the load should be minimized to
prevent unwanted triggering of the OVP.
When utilizing the remote sense feature, care must
be taken not to exceed the maximum allowable
output power capability of the converter, which is
equal to the product of the nominal output voltage
and the allowable output current for the given
conditions.
When using remote sense, the output voltage at the
converter can be increased by as much as 10%
above the nominal rating in order to maintain the
required voltage across the load. Therefore, the
designer must, if necessary, decrease the maximum
current (originally obtained from the derating curves)
by the same percentage to ensure the converter’s
ZD-01744 Rev 1.1.1, 23-Feb-10
www.power-one.com
Page 5 of 13
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