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參數(shù)資料
| 型號： | PQ60240HZA25NNA-G |
| 廠商： | SYNQOR INC |
| 元件分類： | 電源模塊 |
| 英文描述： | 1-OUTPUT 600 W DC-DC REG PWR SUPPLY MODULE |
| 封裝： | ROHS COMPLIANT, HALF BRICK PACKAGE-9 |
| 文件頁數(shù)： | 14/14頁 |
| 文件大?。?/td> | 2078K |
| 代理商： | PQ60240HZA25NNA-G |
Product # PQ60240HZx25
Phone 1-888-567-9596
www.synqor.com
Doc.# 005-0005987 Rev. 1
12/02/10
Page 9
Technical
Specification
PQ60240HZx25
Applications Section
BASIC OPERATION AND FEATURES
The PowerQor series converter uses a two-stage power
conversion 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
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 half-brick, quarter-brick and eighth-
brick converters uses the industry standard footprint and
pin-out configuration.
Open Collector Enable Circuit
Remote Enable Circuit
Direct Logic Drive
Negative Logic
(Permanently Enabled)
ON/OFF
Vin(_
)
ON/OFF
Vin(_
)
ON/OFF
5V
TTL/
CMOS
Vin(_
)
Vin(_
)
Figure A: Various circuits for driving the ON/OFF pin
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(-). 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): 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 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 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 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.
TTL
5V
50k
100p
50k
ON/OFF
Vin(_)
Vcc
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