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PQ60050QTA30NRS 参数 Datasheet PDF下载

PQ60050QTA30NRS图片预览
型号: PQ60050QTA30NRS
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 / 906 K
品牌: SYNQOR [ SYNQOR WORLDWIDE HEADQUARTERS ]
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35-75 V  
5.0 V  
Input:  
Output:  
Current:  
Package:  
30 A  
Quarter-brick  
Technical Specification  
BASIC OPERATION AND FEATURES  
CONTROL 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.  
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  
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.  
Both the first stage and the second stage switch at a fixed fre-  
quency for predictable EMI performance. Rectification of the trans-  
former’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.  
REMOTE SENSE(+) (Pins 7 and 5): The SENSE(+) inputs  
correct for voltage drops along the conductors that connect the  
converter’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  
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.  
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 higher than its specified  
value.  
Note: the output over-voltage protection circuit senses the volt-  
age across the output (pins 8 and 4) to determine when it should  
trigger, not the voltage across the converter’s sense leads (pins  
7 and 5). Therefore, the resistive drop on the board should be  
small enough so that output OVP does not trigger, even during  
load transients.  
ON/OFF  
ON/OFF  
ON/OFF  
_
_
_
Vin( )  
Vin( )  
Vin( )  
5V  
+
Vin( )  
RemoteꢀEnableꢀCircuit  
NegativeꢀLogic  
PositiveꢀLogic  
(PermanentlyꢀEnabled) (PermanentlyꢀEnabled)  
274k  
50k  
ON/OFF  
ON/OFF  
5V  
TTL  
100pF  
50k  
ON/OFF  
TTL/  
CMOS  
Vin(_)  
_
Vin( )  
_
Vin( )  
Figure B: Internal ON/OFF pin circuitry  
DirectꢀLogicꢀDrive  
OpenꢀCollectorꢀEnableꢀCircuit  
Figure A: Various circuits for driving the ON/OFF pin.  
Product # PQ60050QTA30  
Phone 1-888-567-9596  
www.synqor.com  
Doc.# 005-2QT650C Rev. E  
05/20/09  
Page 9