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参数资料
| 型号： | DQ65033QKA04PKS |
| 厂商： | SYNQOR INC |
| 元件分类： | 电源模块 |
| 英文描述： | 2-OUTPUT 40 W DC-DC REG PWR SUPPLY MODULE |
| 文件页数： | 4/15页 |
| 文件大小： | 546K |
| 代理商： | DQ65033QKA04PKS |
Product # DQ65033QKA04
Phone 1-888-567-9596
Doc.# 005-2DQ653L Rev. B
11/11/04
Page 12
T
Technical S
echnical Specification
pecification
Input:
Outputs:
Current:
P
Package:
ackage:
35-75V
5.0V & 3.3V
40W
Quarter-brick
BASIC OPERATION AND FEATURES
The
DualQor series converter uses a two-stage power conversion
topology in which the two output voltages are cross regulated.
The first stage is a buck-converter that keeps the output voltage
constant over variations in line, load, and temperature. The sec-
ond stage uses a transformer to provide the functions of
input/output isolation and voltage step-down to achieve the low
output voltage required.
The two-stage solution is ideal for converters with multiple cross-
regulated output voltages. The first-stage compensates for any
variations in line voltage. Therefore, the dependence of the out-
put voltage on line variations is minimized.
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
DualQor series of converters 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.
However, baseplated versions
are available for optional heatsinking in severe thermal envi-
ronments.
The
DualQor series converter uses the industry standard foot-
print and pin-out configuration.
The
DualQor has many standard control and protection fea-
tures. All shutdown features are non-latching, meaning that
the converter shuts off for 200 ms before restarting. (See
Figure F)
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 inter-
nal ON/OFF circuitry.
OUTPUT VOLTAGE TRIM (Pin 6): The TRIM input permits the
user to adjust the output voltage up or down according to the trim
range specifications. It is important to recognize that adjusting
one output will also adjust the second output proportionally. To
lower the output voltage, the user should connect a resistor
between Pin 6 and Pin 4. To raise the output voltage, the user
should connect a resistor between Pin 6 and Pin 5. The follow-
ing table shows the resistor values needed to trim the output volt-
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
Vin(_
)
ON/OFF
5V
TTL/
CMOS
Vin(_
)
ON/OFF
Vin(_)
Vin(_
)
TTL
5V
50k
274k
Vin(+)
ON/OFF
Vin(_)
50k
100pF
Vo(%)
1
2
3
4
5
6
7
8
9
10
R up
50
23
14 9.2 6.4 4.5 3.1 2.1 1.3
0
R down
67
30
17
11 7.8 5.4 3.7 2.4 1.4
0
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