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參數(shù)資料
| 型號： | PQ60280FTB26PRS-G |
| 廠商： | SYNQOR INC |
| 元件分類： | 電源模塊 |
| 英文描述： | DC-DC REG PWR SUPPLY MODULE |
| 封裝： | ROHS COMPLIANT, FULL BRICK PACKAGE-18 |
| 文件頁數(shù)： | 3/15頁 |
| 文件大?。?/td> | 1225K |
| 代理商： | PQ60280FTB26PRS-G |
Product # PQ60280FTx26
Phone 1-888-567-9596
www.synqor.com
Doc.# 005-0005257 Rev. B
08/20/09
Page 11
Input:
Output:
Current:
Package:
36-75 V
28 V
26 A
Full-brick
Technical Specification
BASIC OPERATION AND FEATURES
The PowerQor series converter 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 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
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 series of converters do not need a metal baseplate
or potting material to help conduct the dissipated energy to the
heatsink. The PowerQor series of converters can thus be built more
simply and reliably using high yield surface mount techniques on
a PCB substrate.
The PowerQor series converters use the industry standard footprint
and pin-out configuration.
CONTROL FEATURES
REMOTE ON/OFF (Pin 3): The (+)ON/OFF input, Pin 3, per-
mits the user to control when the converter is on or off. This input
is referenced (-)ON/OFF. 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 ION/OFF turns the converter on). In the nega-
tive logic version, the ON/OFF signal is active low (meaning that
a low ION/OFF turns the converter on). Figures A & B detail two
possible circuits for driving the ON/OFF pin.
REMOTE SENSE(+) (Pins 11 and 12): The SENSE(+) inputs
correct for voltage drops along the conductors that connect the
converter’s output pins to the load.
Pin 11 should be connected to Vout(+) and Pin 12 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
Pins 11 and 12 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
across the output (pins 16 and 13) to determine when it should
trigger, not the voltage across the converter’s sense leads (pins
11 and 12). Therefore, the resistive drop on the board should
be small enough so that output OVP does not trigger, even during
load transients.
OUTPUT VOLTAGE TRIM (Pin 10): The TRIM input permits
the user to adjust the output voltage across the sense leads up or
down according to the trim range specifications.
To decrease the output voltage, the user should connect a resis-
tor between Pin 10 and Pin 12 (SENSE(-) input). For a desired
decrease of the nominal output voltage, the value of the resistor
should be
Rtrim-down =
(732) - 8.94 (kW)
D
where
D% = Vnominal – Vdesired
x 100%
Vnominal
To increase the output voltage, the user should connect a resistor
between Pin 7 and Pin 8 (SENSE(+) input). For a desired increase
of the nominal output voltage, the value of the resistor should be
(k
W)
Rtrim-up =
16000 + 158.4 x (VDES - VNOM)
VDES - VNOM
ION/OFF
VIN
IN
(+)
+ON/OFF
-ON/OFF
V (-)
VOUT(+)
SENSE (+)
SENSE (-)
VOUT(-)
ION/OFF
VIN
IN
(+)
+ON/OFF
-ON/OFF
V (-)
VOUT(+)
SENSE (+)
SENSE (-)
VOUT(-)
Figure A:
Typical circuit for driving the ON/OFF pin.
Figure B:
Another circuit for driving the ON/OFF pin.
Application Section
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