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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  
OUTPUT VOLTAGꢁ TRIM (Pin 6):ꢀTheꢀTRIMꢀinputꢀpermitsꢀtheꢀ  
usertoadjusttheoutputvoltageacrossthesenseleadsuporꢀ  
down according to the trim range specifications.  
PROTECTIONꢀFEATURES  
Input Under-Voltage Lockout:ꢀ Theꢀ converterꢀ isꢀ designedꢀ  
to turn off when the input voltage is too low, helping avoid an  
input system instability problem, described in more detail in  
the application note titled “Inputꢀ Systemꢀ Instability”ꢀ onꢀ ourꢀ  
website. The lockout circuitry is a comparator with dc hysteresis.  
Whenꢀtheꢀinputꢀvoltageꢀisꢀrising,ꢀitꢀmustꢀexceedꢀtheꢀtypicalꢀTurn-  
OnVoltageThresholdvalue(listedonthespecificationspage)ꢀ  
beforeꢀ theꢀ converterꢀ willꢀ turnꢀ on.ꢀ Onceꢀ theꢀ converterꢀ isꢀ on,ꢀ  
theꢀ inputꢀ voltageꢀ mustꢀ fallꢀ belowꢀ theꢀ typicalꢀ Turn-Offꢀ Voltageꢀ  
Threshold value before the converter will turn off.  
To decrease the output voltage, the user should connect a  
resistorꢀbetweenꢀPinꢀ6ꢀandꢀPinꢀ5ꢀ(SENSE(-)ꢀinput).ꢀForꢀaꢀdesiredꢀ  
decrease of the nominal output voltage, the value of the resistor  
should be  
511  
R
=
-ꢀ10.22 (kW)  
trim-down  
(%)  
where  
Vnominalꢀ–ꢀVdesired  
Output Current Limit:ꢀ Theꢀ maximumꢀ currentꢀ limitꢀ remainsꢀ  
constant as the output voltage drops. However, once the  
impedance of the load across the output is small enough to make  
theꢀoutputꢀvoltageꢀdropꢀbelowꢀtheꢀspecifiedꢀOutputꢀDCꢀCurrent-  
LimitꢀShutdownꢀVoltage,ꢀtheꢀconverterꢀturnsꢀoff.  
=
xꢀ100%  
∆%  
Vnominal  
To increase the output voltage, the user should connect a  
resistorꢀbetweenꢀPinꢀ6ꢀandꢀPinꢀ7ꢀ(SENSE(+)ꢀinput).ꢀForꢀaꢀdesiredꢀ  
increase of the nominal output voltage, the value of the resistor  
should be  
Theꢀconverterꢀthenꢀentersꢀaꢀ“hiccupꢀmode”ꢀwhereꢀitꢀrepeatedlyꢀ  
turnsꢀonꢀandꢀoffꢀatꢀaꢀ5ꢀHzꢀ(nominal)ꢀfrequencyꢀwithꢀaꢀ5%ꢀdutyꢀ  
cycle until the short circuit condition is removed. This prevents  
excessive heating of the converter or the load board.  
5.11VOUTꢀ (100+%)  
x
511  
_
R
_
=
(kW)  
trim-up  
10.22  
)
(
1.225%  
%  
Output Over-Voltage Limit:ꢀIfꢀtheꢀvoltageꢀacrossꢀtheꢀoutputꢀ  
pinsꢀexceedsꢀtheꢀOutputꢀOver-VoltageꢀProtectionꢀthreshold,ꢀtheꢀ  
converter will immediately stop switching. This prevents damage  
toꢀtheꢀloadꢀcircuitꢀdueꢀtoꢀ1)ꢀexcessiveꢀseriesꢀresistanceꢀinꢀoutputꢀ  
currentꢀ pathꢀ fromꢀ converterꢀ outputꢀ pinsꢀ toꢀ senseꢀ point,ꢀ 2)ꢀ aꢀ  
releaseꢀofꢀaꢀshort-circuitꢀcondition,ꢀorꢀ3)ꢀaꢀreleaseꢀofꢀaꢀcurrentꢀ  
limitꢀ condition.ꢀ Loadꢀ capacitanceꢀ determinesꢀ exactlyꢀ howꢀ highꢀ  
theꢀoutputꢀvoltageꢀwillꢀriseꢀinꢀresponseꢀtoꢀtheseꢀconditions.ꢀAfterꢀ  
200ꢀmsꢀtheꢀconverterꢀwillꢀautomaticallyꢀrestart.  
where  
V
ꢀ=ꢀNominalꢀOutputꢀVoltage  
out  
Graphsꢀ onꢀ Pageꢀ 3ꢀ showꢀ theꢀ relationshipꢀ betweenꢀ theꢀ trimꢀ  
resistorvalueandRtrim-upandRtrim-down,showingthetotalꢀ  
range the output voltage can be trimmed up or down.  
Note:ꢀtheꢀTRIMꢀfeatureꢀdoesꢀnotꢀaffectꢀtheꢀvoltageꢀatꢀwhichꢀtheꢀ  
output over-voltage protection circuit is triggered. Trimming the  
output voltage too high may cause the over-voltage protection  
circuit to engage, particularly during transients.  
Over-Temperature Shutdown:ꢀ Aꢀ temperatureꢀ sensorꢀ onꢀ  
the converter senses the average temperature of the module.  
The thermal shutdown circuit is designed to turn the converter  
off when the temperature at the sensed location reaches the  
Over-Temperatureꢀ Shutdownꢀ value.ꢀ Itꢀ willꢀ allowꢀ theꢀ converterꢀ  
to turn on again when the temperature of the sensed location  
fallsꢀbyꢀtheꢀamountꢀofꢀtheꢀOver-TemperatureꢀShutdownꢀRestartꢀ  
Hysteresis value.  
It is not necessary for the user to add capacitance at the Trim  
pin. The node is internally bypassed to eliminate noise.  
Total DC Variation of V  
specifications, the maximum variation of the dc value of V  
:Fortheconvertertomeetitsfullꢀ  
OUT  
, due  
OUT  
to both trimming and remote load voltage drops, should not be  
greater than that specified for the output voltage trim range.  
Product # IQ32xxxHPCxx  
Phone 1-888-567-9596  
www.synqor.com  
Doc.# 005-005H332 Rev. 1  
08/13/08  
Page 9