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參數(shù)資料
| 型號： | PQ60280HEF13PYH |
| 廠商： | SYNQOR INC |
| 元件分類： | 電源模塊 |
| 英文描述： | 1-OUTPUT 360 W DC-DC REG PWR SUPPLY MODULE |
| 封裝： | ROHS COMPLIANT, HALF BRICK PACKAGE-9/8 |
| 文件頁數(shù)： | 3/14頁 |
| 文件大?。?/td> | 615K |
| 代理商： | PQ60280HEF13PYH |
Product # PQ60280HEA13
Phone 1-888-567-9596
Doc.# 005-2HE628P Rev. C
7/3/07
Page 11
T
Technical S
echnical Specification
pecification
Input:
Output:
Current:
PPackage:
ackage:
35-75 V
28 V
12.8 A
Half-brick
BASIC OPERATION AND FEATURES
The PowerQor series converter uses a two-stage power conver-
sion 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 isola-
tion 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
transformer’s output is accomplished with synchronous rectifiers.
These devices, which are MOSFETs with a very low on-state resis-
tance, dissipate far less energy than Schottky diodes. This is the
primary reason that the PowerQor converter has such high effi-
ciency, even at very low output voltages and very high output cur-
rents.
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 and quarter-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.
REMOTE SENSE(+) (Pins 8 and 6): The SENSE(+) inputs cor-
rect for voltage drops along the conductors that connect the con-
verter’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
Pins 8 and 6 must be connected for proper regulation of the out-
put 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 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.
OUTPUT VOLTAGE TRIM (Pin 7): 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 resistor
between Pin 7 and Pin 6 (SENSE(-) input). For a desired decrease
of the nominal output voltage, the value of the resistor should be
Rtrim-down =
(
100%) - 2 (kW)
D
where
D% = Vnominal – Vdesired x 100%
Vnominal
Open Collector Enable Circuit
Figure A: Various circuits for driving the ON/OFF pin.
Remote Enable Circuit
Direct Logic Drive
Negative Logic
(Permanently Enabled)
Positive Logic
(Permanently Enabled)
ON/OFF
Vin(_
)
ON/OFF
Vin(_
)
ON/OFF
5V
TTL/
CMOS
Vin(_
)
ON/OFF
Vin(_)
Vin(_
)
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