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DATA SHEET
2
2.1
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 con-
verter can affect the stability of the converter. A 33μ F electrolytic capacitor with an ESR < 1 ? across the input is recom-
mended to ensure stability of the converter 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 opera-
tion with external load capacitance up to 20,000μ F.
2.2
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 typical connection is shown in Fig. A.
Fig. A: Circuit configuration for ON/OFF function.
Vin (+)
SQE48 Converter
(Top View)
Vout (+)
SENSE (+)
Vin
ON/OFF
TRIM
Rload
SENSE (-)
Vin (-)
Vout (-)
CONTROL
INPUT
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 5V 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 0.2mA at a
low level voltage of ? 0.8V. An external voltage source (± 20V maximum) may be connected directly to the ON/OFF input, in
which case it must be capable of sourcing or sinking up to 1mA depending on the signal polarity. See the Startup Information
section for system timing waveforms associated with use of the ON/OFF pin.
2.3
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 regula-
tion is required (see Fig. B).
Fig. B: Remote sense circuit configuration.
Vin (+)
SQE48 Converter
(Top View)
Vout (+)
100
Rw
SENSE (+)
Vin
ON/OFF
TRIM
Rload
SENSE (-)
10
Vin (-)
Vout (-)
Rw
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 connec-
tions are not made, the converter will deliver an output voltage that is higher than the specified data sheet value.
SQE48T40015 DC-DC Converter
4
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