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PQ50073HZB60NNS-G Datasheet(PDF) 9 Page - SynQor Worldwide Headquarters

Part No. PQ50073HZB60NNS-G
Description  Active back bias limit
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Manufacturer  SYNQOR [SynQor Worldwide Headquarters]
Direct Link  http://www.synqor.com
Logo SYNQOR - SynQor Worldwide Headquarters

PQ50073HZB60NNS-G Datasheet(HTML) 9 Page - SynQor Worldwide Headquarters

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Product # PQ50073HZB60
Phone 1-888-567-9596
www.synqor.com
Doc.# 005-0005484 Rev. B
10/25/12
Page 9
Input:
44-52V
Output:
7.3V
Current:
60A
Package:
Half-Brick
Applications Section
Applications Section
BASIC OPERATION AND FEATURES
This converter series uses a two-stage power conversion
topology. The first stage 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
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 significantly less energy than Schottky
diodes, enabling the converter to achieve high efficiency.
Dissipation throughout the converter is so low that it does not
require a heatsink or even a baseplate for operation in many
applications; however, adding a heatsink provides improved
thermal derating performance in extreme situations. To further
withstand harsh environments and thermally demanding
applications, certain models are available totally encased. See
Ordering Information page for available thermal design options.
SynQor half-brick converters use the industry standard footprint
and pin-out.
Figure A: Various Circuits for Driving the ON/OFF Pin.
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(_
)
TTL
5V
10k
50k
ON/OFF
Vin(_)
18V(max)
Figure B: Internal ON/OFF Pin Circuitry.
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(-).
In negative logic versions, the ON/OFF signal is active low
(meaning that a low voltage turns the converter on). In positive
logic versions, the ON/OFF input is active high (meaning that a
high voltage turns the converter on). Figure A details possible
circuits for driving the ON/OFF pin. Figure B is a detailed look of
the internal ON/OFF circuitry. See Ordering Information page for
available enable logics.
REMOTE SENSE Pins 8(+) and 6(-): The SENSE(+) and
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
connected to Vout(-) at the point on the board where regulation
is desired. 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 9 and 5) to determine when it
should trigger, 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.


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