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參數(shù)資料
| 型號(hào)： | PQ60025HPA80NKF |
| 廠商： | SYNQOR INC |
| 元件分類： | 電源模塊 |
| 英文描述： | DC-DC REG PWR SUPPLY MODULE |
| 封裝： | half-brick, package-9 |
| 文件頁數(shù)： | 2/13頁 |
| 文件大?。?/td> | 1292K |
| 代理商： | PQ60025HPA80NKF |
Product # PQ60120HPA20
Phone 1-888-567-9596
www.synqor.com
Doc.# 005-2HP612K Rev. F
08/12/09
Page 10
Input:
Output:
Current:
Package:
35-75 V
12 V
20 A
Half-brick
Technical Specification
Note: the output over-voltage protection circuit senses the
voltage across the output (pins 9 and 5) to determine when
it should trigger, not the voltage across the converter’s sense
leads(pins8and6).Therefore,theresistivedropontheboard
should be small enough so that output OVP does not trigger,
evenduringloadtransients.
OUTPUT VOLTAGE TRIM (Pin 7): The TRIM input permits
theusertoadjusttheoutputvoltageacrossthesenseleadsup
ordownaccordingtothetrimrangespecifications.
To decrease the output voltage, the user should connect a
resistorbetweenPin7andPin6(SENSE(-)input).Foradesired
decreaseofthenominaloutputvoltage,thevalueoftheresistor
shouldbe
Rtrim-down=
(100%)-2(kW)
D
where
D% = Vnominal–Vdesired x100%
Vnominal
To increase the output voltage, the user should connect a
resistorbetweenPin7andPin8(SENSE(+)input).Foradesired
increaseofthenominaloutputvoltage,thevalueoftheresistor
shouldbe
FigureCgraphstherelationshipbetweenthetrimresistorvalue
and Rtrim-up and Rtrim-down, showing the total range the
outputvoltagecanbetrimmedupordown.
Figure C: Trim Graph for 12Vout module
Note:theTRIMfeaturedoesnotaffectthevoltageatwhichthe
outputover-voltageprotectioncircuitistriggered.Trimmingthe
outputvoltagetoohighmaycausetheover-voltageprotection
circuittoengage,particularlyduringtransients.
ItisnotnecessaryfortheusertoaddcapacitanceattheTrim
pin.Thenodeisinternallybypassedtoeliminatenoise.
Total DC Variation of Vout:Fortheconvertertomeetitsfull
specifications,themaximumvariationoftheDCvalueofVout,
duetobothtrimmingandremoteloadvoltagedrops,shouldnot
begreaterthanthatspecifiedfortheoutputvoltagetrimrange.
PROTECTIONFEATURES
Input Under-Voltage Lockout: The converter is designed
toturnoffwhentheinputvoltageistoolow,helpingavoidan
inputsysteminstabilityproblem,describedinmoredetailinthe
application note titled “Input System Instability”. The lockout
circuitry is a comparator with DC hysteresis. When the input
voltage is rising, it must exceed the typical Turn-On Voltage
Threshold value (listed on the specification page) before the
converter will turn on. Once the converter is on, the input
voltagemustfallbelowthetypicalTurn-OffVoltageThreshold
valuebeforetheconverterwillturnoff.
Input Over-Voltage Shutdown: Available on PQ48 models
only. The converter turns off when the input voltage is too
high, allowing the converter to withstand an input voltage as
high as 100V without destruction. The shutdown circuitry is a
comparatorwithDChysteresis.Whentheinputvoltageexceeds
the typical Input Over-Voltage Shutdown value, the converter
willturnoff.Oncetheconverterisoff,itwillturnbackonwhen
theinputvoltagefallsbelowtheminimumInputOver-Voltage
Shutdownvalue.
Output Current Limit: The maximum current limit remains
constant as the output voltage drops. However, once the
impedance of the short across the output is small enough to
make the output voltage drop below the specified Output DC
Current-LimitShutdownVoltage,theconverterturnsoff.
Theconverterthenentersa“hiccupmode”whereitrepeatedly
turnsonandoffata5Hz(nominal)frequencywitha5%duty
cycleuntiltheshortcircuitconditionisremoved.Thisprevents
excessiveheatingoftheconverterortheloadboard.
Output Over-Voltage Limit:Ifthevoltageacrosstheoutput
pinsexceedstheOutputOver-VoltageProtectionthreshold,the
converterwillimmediatelystopswitching.Thispreventsdamage
totheloadcircuitdueto1)excessiveseriesresistanceinoutput
current path from converter output pins to sense point, 2) a
releaseofashort-circuitcondition,or3)areleaseofacurrent
limit condition. Load capacitance determines exactly how high
theoutputvoltagewillriseinresponsetotheseconditions.After
200mstheconverterwillautomaticallyrestart.
1
10
100
1,000
10,000
0
2
4
6
8
10
12
14
16
18
20
T
ri
m
R
e
s
is
ta
n
c
e
(k
O
h
m
s
)
% Increase in Vout
% Decrease in Vout
(k
W)
Rtrim-up
=
(Vnominal–2)xVDES+VNOM
1.225
VDES-VNOM
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