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参数资料
| 型号： | DQ62412QKA02NKS |
| 厂商： | SYNQOR INC |
| 元件分类： | 电源模块 |
| 英文描述： | 2-OUTPUT 20 W DC-DC REG PWR SUPPLY MODULE |
| 文件页数： | 4/15页 |
| 文件大小： | 617K |
| 代理商： | DQ62412QKA02NKS |
Product # DQ62412QKA02
Phone 1-888-567-9596
Doc.# 005-2DQ245L Rev. A
06/08/05
Page 12
T
Technical S
echnical Specification
pecification
Input:
Outputs:
Current:
PPackage:
ackage:
35-75V
2.45V & 1.225V
20W
Quarter-brick
BASIC OPERATION AND FEATURES
The
DualQor series converter uses a two-stage power conver-
sion topology in which the two output voltages are cross regu-
lated. 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.
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
output 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 recti-
fiers. 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
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 ver-
sions are available for optional heatsinking in severe ther-
mal environments.
The
DualQor series converter uses the industry standard
footprint 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, per-
mits 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 cir-
cuits for driving the ON/OFF pin. Figure B is a detailed look of
the internal 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 propor-
tionally. 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
following table shows the resistor values needed to trim the out-
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(%)
1234
5678
9
10
R up
54.9
24.9
14.3
9.13
6.34
4.32
2.8
1.69
825
0.0
R down
68.1
30.1
17.8
11.5
7.68
5.36
3.48
2.1
1.05
0.0
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