Technical Specification
Quarter
48V 15V
6.7A
out
in
Brick
BASIC OPERATION AND FEATURES
CONTROL FEATURES
The PowerQor series converter uses a two-stage power circuit
topology. The first stage is a buck-converter that keeps the out-
put voltage constant over variations in line, load, and temper-
ature. The second stage uses a transformer to provide the func-
tions of input/output isolation and voltage step-down to achieve
the low output voltage required.
REMOTE ON/OFF (Pin 2): The ON/OFF input, Pin 2, per-
mits the user to control when the converter is on or off. This
input is referenced to the return terminal of the input bus,
Vin(-). There are two versions of the converter that differ by the
sense of the logic used for the ON/OFF input.
In the positive logic version, the ON/OFF input is active high
(meaning that a high turns the converter on). In the negative
logic version, the ON/OFF signal is active low (meaning that a
low turns the converter on). Figure A details five possible cir-
cuits for driving the ON/OFF pin. Figure B is a detailed look of
the internal ON/OFF circuitry.
Both the first stage and the second stage switch at a fixed fre-
quency for predictable EMI performance. Rectification of the
transformer’s output is accomplished with synchronous recti-
fiers. These devices, which are MOSFETs with a very low on-
state resistance, dissipate far less energy than Schottky diodes.
This is the primary reason that the PowerQor converter has such
high efficiency, even at very low output voltages and very high
output currents.
REMOTE SENSE(+) (Pins 7 and 5): The SENSE(+) inputs
correct for voltage drops along the conductors that connect the
converter’s output pins to the load.
Dissipation throughout the converter is so low that it does not
require a heatsink for operation. Since a heatsink is not
required, the PowerQor converter does not need a metal base-
plate or potting material to help conduct the dissipated energy
to the heatsink. The PowerQor converter can thus be built more
simply and reliably using high yield surface mount techniques
on a PCB substrate.
Pin 7 should be connected to Vout(+) and Pin 5 should be con-
nected to Vout(-) at the point on the board where regulation is
desired. A remote connection at the load can adjust for a volt-
age drop only as large as that specified in this datasheet, that
is
[Vout(+) - Vout(-)] – [SENSE(+) - SENSE(-)] <
Sense Range % x Vout
The PowerQor series of half-brick and quarter-brick converters
uses the industry standard footprint and pin-out configuration.
Pins 7 and 5 must be connected for proper regulation of the
output voltage. If these connections are not made, the convert-
er will deliver an output voltage that is slightly lower than its
specified value.
ON/OFF
ON/OFF
ON/OFF
_
_
_
Vin( )
Vin( )
Vin( )
Vin(+)
5V
Positive Logic
(Permanently Enabled)
Negative Logic
(Permanently Enabled)
Remote Enable Circuit
274k
5V
ON/OFF
ON/OFF
50k
TTL
TTL/
CMOS
ON/OFF
100pF
50k
_
Vin( )
_
_
Vin( )
Vin( )
Open Collector Enable Circuit
Direct Logic Drive
Figure A: Various circuits for driving the ON/OFF pin.
Figure B: Internal ON/OFF pin circuitry
Product # PQ48150QGA07
Phone 1-888-567-9596
Doc.# 005-2QG415D Rev. D
8/16/02
Page 9
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