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PQ60120EKX04 Datasheet(PDF) 11 Page - SynQor Worldwide Headquarters

Part No. PQ60120EKX04
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

PQ60120EKX04 Datasheet(HTML) 11 Page - SynQor Worldwide Headquarters

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Product # PQ60120EKx04
Phone 1-888-567-9596
www.synqor.com
Doc.# 005-0005190 Rev. A
07/13/09
Page 11
Input:
Output:
Current:
Part No.:
35-75V
12V
4A
PQ60120EKx04
Technical Specification
Application Section
BASIC OPERATION AND FEATURES
The single stage power converter switches at a fixed
frequency for predictable EMI performance. Rectification of
the transformer’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 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 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.
The PowerQor series of eighth-brick, quarter-brick and half-
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
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 circuits
for driving the ON/OFF pin. Figure B is a detailed look of the
internal ON/OFF circuitry.
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.
Pin 7 should be connected to Vout(+) and Pin 5 should be
connected 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 7 and 5 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 specified value.
Note: the output over-voltage protection circuit senses the
voltage across the output (pins 8 and 4) to determine when
it should trigger, not the voltage across the converter’s sense
leads (pins 7 and 5). Therefore, the resistive drop on the board
should be small enough so that output OVP does not trigger,
even during load transients.
Open Collector Enable Circuit
Figure A:
Various circuits for driving the ON/OFF pin.
Figure B:
Internal ON/OFF pin circuitry
Remote Enable Circuit
Direct Logic Drive
Negative Logic
(Permanently Enabled)
Positive Logic
(Permanently Enabled)
ON/OFF
Vin(_
)
ON/OFF
ON/OFF
Vin(_
)
ON/OFF
5V
TTL/
CMOS
Vin(_
)
ON/OFF
Vin(_)
Vin(_
)
TTL
5V
50k
10k
ON/OFF
Vin(_)
100pF


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