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PQ50050HPB50 Datasheet(PDF) 10 Page - SynQor Worldwide Headquarters

Part No. PQ50050HPB50
Description  Output voltage trim permits custom voltages and voltage margining
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Manufacturer  SYNQOR [SynQor Worldwide Headquarters]
Direct Link  http://www.synqor.com
Logo SYNQOR - SynQor Worldwide Headquarters

PQ50050HPB50 Datasheet(HTML) 10 Page - SynQor Worldwide Headquarters

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Product # PQ50050HPB50
Phone 1-888-567-9596
www.synqor.com
Doc.# 005-0005487 Rev. A
03/18/10
Page 10
Input:
Output:
Current:
Part No.:
BASIC OPERATION AND FEATURES
The PowerQor series converter uses a two-stage power conversion
Power
Power
topology. The first stage is a buck-converter that keeps the output
voltage constant over variations in line, load, and temperature.
The second stage uses a transformer to provide the functions of
input/output isolation and voltage step-down to achieve the low
output voltage required.
Both the first stage and the second stage switch at a fixed fre-
quency for predictable EMI performance. Rectification of the trans-
former’s output is accomplished with synchronous rectifiers. 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
Power
Power
at very low output voltages and very high output currents.
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 baseplate or pot-
ting 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.
The PowerQor series of half-brick, quarter-brick and eighth-
brick converters uses the industry standard footprint and
pin-out configuration.
CONTROL FEATURES
REMOTE ON/OFF (Pin 2): The ON/OFF input, Pin 2, permits
the user to control when the converter is on or off. This input is ref-
erenced 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 circuits for
driving the ON/OFF pin. Figure B is a detailed look of the internal
ON/OFF circuitry.
REMOTE SENSE(+) (Pins 8 and 6):
REMOTE SENSE(+) (Pins 8 and 6): The SENSE(+) inputs
The SENSE(+) inputs
correct for voltage drops along the conductors that connect the
converter’s output pins to the load.
Pin 8 should be connected to Vout(+) and Pin 6 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 voltage
drop only as large as that specified in this datasheet, that is
[Vout(+) - Vout(-)] [Vsense(+) - Vsense(-)] <
Sense Range % x Vout
Pins 8 and 6 must be connected for proper regulation of the
output voltage. If these connections are not made, the converter
will deliver an output voltage that is slightly higher than its speci-
fied value.
Note: the output over-voltage protection circuit senses the voltage
Note: the output over-voltage protection circuit senses the voltage
across the output (pins 9 and 5) to determine when it should trig-
ger, not the voltage across the converter’s sense leads (pins 8 and
6). Therefore, the resistive drop on the board should be small
enough so that output OVP does not trigger, even during load
transients.
Figure A: Various circuits for driving the ON/OFF pin.
TTL
5V
ON/OFF
Vin(_)
Vin(+
in(
in( )
+
+
50k
274k
50k
100pF
Open Collector Enable Circuit
Remote Enable Circuit
Direct Logic Drive
Negative Logic
(Permanently
Enabled)
(Permanently
Enabled)
ON/OFF
Vin(_
)
ON/OFF
ON/OFF
Vin(_
)
ON/OFF
5V
TTL/
CMOS
Vin(_
)
Vin(_
)
Positive Logic
ON/OFF
Vin(_
)
Figure B: Internal ON/OFF pin circuitry


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