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參數(shù)資料
| 型號(hào)： | PQ60018ETL45PNS-G |
| 廠商： | SYNQOR INC |
| 元件分類(lèi)： | 電源模塊 |
| 英文描述： | 1-OUTPUT 81 W DC-DC REG PWR SUPPLY MODULE |
| 封裝： | ROHS COMPLIANT, EIGHTH-BRICK PACKAGE-8 |
| 文件頁(yè)數(shù)： | 4/14頁(yè) |
| 文件大?。?/td> | 1098K |
| 代理商： | PQ60018ETL45PNS-G |
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Product # PQ60018ETL45
Phone 1-888-567-9596
www.synqor.com
Doc.# 005-2ET618F Rev. B
06/01/09
Page 12
Input:
Output:
Current:
Package:
35-75 V
1.8 V
45 A
Eighth-brick
Technical Specification
APPLICATIONCONSIDERATIONS
Input System Instability: This condition can occur because
any DC/DC converter appears incrementally as a negative
resistance load. A detailed application note titled “Input
SystemInstability”isavailableontheSynQorwebsitewhich
provides an understanding of why this instability arises, and
shows the preferred solution for correcting it.
Application Circuits:FigureDbelowprovidesatypicalcircuit
diagram which details the input filtering and voltage trimming.
Input Filtering and External Capacitance:FigureEbelow
provides a diagram showing the internal input filter components.
This filter dramatically reduces input terminal ripple current, which
otherwise could exceed the rating of an external input electro-
lytic capacitor. The recommended external input capacitance is
specified in the “Input Characteristics” section. More detailed
information is available in the application note titled “EMI
Characteristics”ontheSynQorwebsite.
Startup/Restart Inhibit Period: The Restart Inhibit Period
ensures that the converter will remain off for approximately
200msonceitisshutdown.Whenanoutputshortispresent,this
generates a 5Hz “hiccup mode,” which prevents the converter
fromoverheating.Inall,therearefivewaysthattheconvertercan
beshutdownthatinitiateaRestartInhibitPeriod:
InputUnder-VoltageLockout
OutputOver-VoltageProtection
OverTemperatureShutdown
CurrentLimit
TurnedoffbytheON/OFFinput
Figure F shows four turn-on scenarios, where a Restart Inhibit
Period is initiated at t1, t2, and t3:
A Startup Inhibit Period is initiated when the input voltage is
brought up from zero voltage during initial startup, beginning
astheinputvoltagereachesapproximately10V.Attheendof
the Startup Inhibit Period (typically 10mS), if the ON/OFF pin
has been active for at least 1ms, and the input voltage is above
theUnder-VoltageLockoutthreshold,theoutputturnsonwiththe
TypicalTurn-OnTime.Thisisshownattimet0.
Vin
External
Input
Filter
Trim
Vin(+)
Iload
Cload
L
C
Vout(+)
Rtrim-up
or
Rtrim-down
Vsense(+)
ON/OFF
Vin(_)
Vin(+)
Vin(_)
Vout(_)
Vsense(_)
Figure D: Typical application circuit (negative logic unit, permanently enabled).
Figure E: Internal Input Filter Diagram (component values listed on the specifications page).
Electrolytic
Capacitor
47F
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