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PQ60018QTA40NKS 参数 Datasheet PDF下载

PQ60018QTA40NKS图片预览
型号: PQ60018QTA40NKS
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
文件页数/大小: 13 页 / 484 K
品牌: SYNQOR [ SYNQOR WORLDWIDE HEADQUARTERS ]
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Input:  
Output:  
35-75 V  
1.8 V  
Current:  
Package:  
40 A  
Quarter-brick  
Technical Specification  
BASIC OPERATION AND FEATURES  
CONTROL FEATURES  
The PowerQor series converter uses a two-stage power conver-  
sion topology. The first stage is a buck-converter that keeps the  
output voltage constant over variations in line, load, and temper-  
ature. The second stage uses a transformer to provide the func-  
tions of input/output isolation and voltage step-down to achieve  
the low output voltage required.  
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.  
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.  
REMOTE SENSE(+) (Pins 7 and 5): The SENSE(+) inputs cor-  
rect for voltage drops along the conductors that connect the con-  
verter’s output pins to the load.  
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.  
Pin 7 should be connected to Vout(+) and Pin 5 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  
[Vout(+) - Vout(-)] [Vsense(+) - Vsense(-)] <  
Sense Range % x Vout  
The PowerQor series of half-brick and quarter-brick converters  
uses the industry standard footprint and pin-out configuration.  
Pins 7 and 5 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 lower than its specified  
value.  
Note: the output over-voltage protection circuit senses the voltage  
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 # PQ60018QTA40  
Phone 1-888-567-9596  
www.synqor.com  
Doc.# 005-2QT618C Rev. C  
09/08/05  
Page 9