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DQ65033QMA06NRS 参数 Datasheet PDF下载

DQ65033QMA06NRS图片预览
型号: DQ65033QMA06NRS
PDF下载: 下载PDF文件 查看货源
内容描述: 四分之一砖DC / DC转换器 [Quarter-brick DC/DC Converter]
分类和应用: 转换器电源电路输出元件
文件页数/大小: 15 页 / 671 K
品牌: SYNQOR [ SYNQOR WORLDWIDE HEADQUARTERS ]
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Input:  
Outputs:  
Current:  
Package:  
35-75V  
5.0V & 3.3V  
60W  
Quarter-brick  
Technical Specification  
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)  
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.  
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,  
are two versions of the converter that differ by the sense of the  
logic used for the ON/OFF input.  
Vin(-). There  
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.  
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.  
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.  
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-  
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.  
Vo(%)  
Rup  
1
2
3
4
5
6
7
8
9
10  
0
0
50 23 14 9.2 6.4 4.5 3.1 2.1 1.3  
Rdown 67 30 17 11 7.8 5.4 3.7 2.4 1.4  
ON/OFF  
ON/OFF  
ON/OFF  
_
_
_
Vin( )  
Vin( )  
Vin( )  
Vin(+)  
5V  
Positive Logic  
(Permanently Enabled)  
Negative Logic  
(Permanently Enabled)  
Remote Enable Circuit  
274k  
5V  
ON/OFF  
ON/OFF  
50k  
TTL  
TTL/  
CMOS  
ON/OFF  
100pF  
50k  
_
Vin( )  
_
_
Vin( )  
Vin( )  
Open Collector Enable Circuit  
Direct Logic Drive  
Figure A: Various circuits for driving the ON/OFF pin.  
Figure B: Internal ON/OFF pin circuitry  
Product # DQ65033QMA06  
Phone 1-888-567-9596  
Doc.# 005-2DQ653E Rev. H  
7/7/04  
Page 12