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参数资料
| 型号： | NQ20W20EGV10NRS-G |
| 厂商： | SYNQOR INC |
| 元件分类： | 电源模块 |
| 英文描述： | 2-OUTPUT 200 W DC-DC REG PWR SUPPLY MODULE |
| 封装： | ROHS COMPLIANT, EIGHT BRICK PACKAGE-8 |
| 文件页数： | 10/10页 |
| 文件大小： | 855K |
| 代理商： | NQ20W20EGV10NRS-G |
Product # NQ20x20EGx10
Phone 1-888-567-9596
www.synqor.com
Doc.# 005-0005379 Rev. B
09/18/09
Page 9
Input:
Outputs:
Current:
Package:
9 - 20V
0 - 20V
10A
Eighth-brick
Technical Specification
APPLICATIONCONSIDERATIONS
Limited output voltage resolution: The internal voltage
control feedback loop has limited resolution. Therefore, the
output voltage will exhibit discrete steps as the loop responds
tochangesinline,load,trim,orremotesense.Forinstance,
on close examination, the startup ramp has a “stair-step”
shape.Likewise,aloadtransientresponsewillbecomposed
ofmultiplediscretesteps.
Input filtering: These modules should be connected to a
low-impedancesource.Ahighlyinductivesourcecanaffectthe
stability of the module. An input capacitance must be placed
directly adjacent to the input pin of the module, to minimize
inputripplevoltageandensuremodulestability.
Output capacitance:Forstableoperationofthemodule,there
is no extra external capacitor required. To reduce the output
ripple and improve dynamic response to a step load change,
additional capacitance at the output can be used. Low ESR
polymer and ceramic capacitors are recommended to improve
the dynamic response of the module. In many applications,
however,additionalexternaloutputcapacitanceisarequirement
whichwillcausethestartuptimetochange.
Remote sense (S option): Vout remote sensing is provided
to achieve proper regulation at the load points and reduce
effectsofdistributionlossesonoutputline.Intheeventofan
openremotesenseline,themoduleshallmaintainlocalsense
regulationthroughaninternalresistor.Themoduleshallcorrect
foratotalof10%Vout.
Current limit: Available power is limited by output current
in buck mode (Vin>Vout), but by input current in boost mode
(Vin<Vout).
forVin>Vout,
Ilimit=1.2xImax
forVin<Vout,
Ilimit=1.2xImax
(Vin)
Vout
whereImax
=Maximumratedoutputcurrent
Negative output: This series of converters can be set to
negativeoutput(seeFigureB).
Vin+
ENABLE
Vin-
Vin-/
Vout+
SENSE+
SENSE-
TRIM
Vout-
Vout- 4
5
6
7
8
1
2
3
Cout1
Rtrim-up
Cin1
Cin2
Dc/dc
converter
Figure B: Negative output setup
Usingthisnegativeoutputsetupimpactstheavailableoutput
voltagerangeandcurrentlimit.
Theoutputvoltagerangebecomes0toVmax-Vin,andthecur-
rentlimitisscaledby:
Vin
(Vin+Vout)
Current monitor/trimmable current limit (C option): In
additiontovoltagetrim,theCoptionoffersanadjustablecurrent
limit input and a current monitor output. The C option also
includesanidealdiodecircuitinserieswiththeVout+pinthat
preventsreversecurrentflow.Thisenablesapplicationssuchas
batterycharging,currentsharing,andcurrentreadback.
Vin+
Vin-
Vin+
ENABLE
Vin-
Vout+
IMON
ITRIM
VTRIM
Vout-
Vout- 4
5
6
7
8
1
2
3
Cout
Rtrim-up
RadjIlim
Cin
Dc/dc
converter
Figure C: Current monitor/trimmable current limit setup
The Rtrim-up resistor increases the output voltage, identical in
functiontotheSoption.
TheRadjItrimresistorreducestheoutputcurrentlimit,according
tothefollowingequation:
RadjItrim=
[(0.0469Imax+Itrim)10200-10]()
1.153Imax+Itrim
Alternatively,theItrimpincanbedrivenfromanexternalvoltage
source:
V(pin5)=2.085(Itrim/Imax)+0.0953
whereItrimisthedesiredcurrentlimitsetpoint
IfIlimitislessthanItrim,thenIlimittakesprecedence.
The Imon pin voltage tracks the output current, as shown in
figure9.Thispinhasa10kOhmoutputimpedance.
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