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IQ32120HPC13NRS 参数 Datasheet PDF下载

IQ32120HPC13NRS图片预览
型号: IQ32120HPC13NRS
PDF下载: 下载PDF文件 查看货源
内容描述: 半砖DC- DC转换器 [Half-brick DC-DC Converter]
分类和应用: 转换器
文件页数/大小: 12 页 / 1723 K
品牌: SYNQOR [ SYNQOR WORLDWIDE HEADQUARTERS ]
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Technical  
Specification  
IQ32-HPC Family  
BASICꢀOPERATIONꢀANDꢀFEATURES  
CONTROLꢀFEATURES  
This converter series 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  
theꢀ functionsꢀ ofꢀ input/outputꢀ isolationꢀ andꢀ voltageꢀ step-upꢀ orꢀ  
step-down to achieve the output voltage required.  
RꢁMOTꢁ Oꢀ/OFF (Pin 2):TheON/OFFinput,Pin2,permitsꢀ  
the user to control when the converter is on or off. This input  
isꢀ referencedꢀ toꢀ theꢀ returnꢀ terminalꢀ ofꢀ theꢀ inputꢀ bus,ꢀ Vin(-).ꢀ  
TheꢀON/OFFꢀsignalꢀisꢀactiveꢀlowꢀ(meaningꢀthatꢀaꢀlowꢀturnsꢀtheꢀ  
converteron).FigureAdetailsfourpossiblecircuitsfordrivingꢀ  
theꢀON/OFFꢀpin.ꢀFigureꢀBꢀisꢀaꢀdetailedꢀlookꢀofꢀtheꢀinternalꢀON/  
OFFꢀcircuitry.  
Bothꢀ theꢀ firstꢀ stageꢀ andꢀ theꢀ secondꢀ stageꢀ switchꢀ atꢀ aꢀ fixedꢀ  
frequencyꢀ forꢀ predictableꢀ EMIꢀ performance.ꢀ Rectificationꢀ ofꢀ  
theꢀ transformer’sꢀ outputꢀ isꢀ accomplishedꢀ withꢀ synchronousꢀ  
rectifiers.ꢀ Theseꢀ devices,ꢀ whichꢀ areꢀ MOSFETsꢀ withꢀ aꢀ veryꢀ lowꢀ  
on-stateꢀ resistance,ꢀ dissipateꢀ farꢀ lessꢀ energyꢀ thanꢀ Schottkyꢀ  
diodes. This is the primary reason that the converter has such  
high efficiency, even at very low output voltages and very high  
output currents.  
RꢁMOTꢁ SꢁꢀSꢁ(+) (Pins 7 and 5):ꢀ Theꢀ SENSE(+)ꢀ inputsꢀ  
correct for voltage drops along the conductors that connect the  
converter’sꢀoutputꢀpinsꢀtoꢀtheꢀload.  
Pinꢀ 7ꢀ shouldꢀ beꢀ connectedꢀ toꢀ Vout(+)ꢀ andꢀ Pinꢀ 5ꢀ shouldꢀ beꢀ  
connectedꢀtoꢀVout(-)ꢀatꢀtheꢀpointꢀonꢀtheꢀboardꢀwhereꢀregulationꢀ  
isꢀ desired.ꢀ Aꢀ remoteꢀ connectionꢀ atꢀ theꢀ loadꢀ canꢀ adjustꢀ forꢀ aꢀ  
voltage drop only as large as that specified in this datasheet,  
that is  
These converters are offered totally encased to withstand harsh  
environmentsꢀandꢀthermallyꢀdemandingꢀapplications.ꢀDissipationꢀ  
throughout the converter is so low that it does not require a  
heatsinkꢀ forꢀ operationꢀ inꢀ manyꢀ applications;ꢀ however,ꢀ addingꢀ  
a heatsink provides improved thermal derating performance in  
extreme situations.  
[Vout(+)ꢀ-ꢀVout(-)]ꢀ–ꢀ[Vsense(+)ꢀ-ꢀVsense(-)] <  
SenseꢀRangeꢀ%ꢀxꢀVout  
Pins 7 and 5 must be connected for proper regulation of  
the output voltage. If these connections are not made, the  
converter will deliver an output voltage that is slightly higher  
than its specified value.  
This series of converters use the industry standard footprint and  
pin-out configuration.  
Note:ꢀ theꢀ outputꢀ over-voltageꢀ protectionꢀ circuitꢀ sensesꢀ theꢀ  
voltageꢀ acrossꢀ theꢀ outputꢀ (pinsꢀ 8ꢀ andꢀ 4)ꢀ toꢀ determineꢀ whenꢀ  
itꢀ shouldꢀ trigger,ꢀ notꢀ theꢀ voltageꢀ acrossꢀ theꢀ converter’sꢀ senseꢀ  
leadsꢀ(pinsꢀ7ꢀandꢀ5).ꢀꢀTherefore,ꢀtheꢀresistiveꢀdropꢀonꢀtheꢀboardꢀ  
shouldꢀ beꢀ smallꢀ enoughꢀ soꢀ thatꢀ outputꢀ OVPꢀ doesꢀ notꢀ trigger,ꢀ  
even during load transients.  
ON/OFF  
ON/OFF  
5V  
_
_
Vin( )  
Vin( )  
NegativeꢀLogic  
(PermanentlyꢀEnabled)  
RemoteꢀEnableꢀCircuit  
50k  
5V  
ON/OFF  
ON/OFF  
50k  
TTL  
TTL/  
CMOS  
ON/OFF  
100pF  
_
Vin( )  
_
_
Vin( )  
Vin( )  
OpenꢀCollectorꢀEnableꢀCircuit  
DirectꢀLogicꢀDrive  
Figure A: Various circuits for driving the ON/OFF pin.  
Figure B: Internal ON/OFF pin circuitry  
Product # IQ32xxxHPCxx  
Phone 1-888-567-9596  
www.synqor.com  
Doc.# 005-005H332 Rev. 1  
08/13/08  
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