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參數(shù)資料
| 型號： | QPO-1LZ-01 |
| 廠商： | Vicor Corporation |
| 文件頁數(shù)： | 4/17頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC INTERFACE FILTER |
| 標準包裝： | 20 |
| 系列： | Picor®, QUIETPOWER® |
| 其它名稱： | 1102-1095-5 |
PICOR Corporation picorpower.com
QPO-1
Rev 3.6
Page 12 of 17
QPO-1
QUIETPOWER
The current required from the QPO is the difference in
current between what is being sunk through the RDN resistor
and what is being sourced by the converter’s SC circuit.
Where: I = current being sourced by the converter’s SC circuit
IDN = current sunk by the trim down resistor
ISC = current required from the QPO
To calculate IDN and I you need to first calculate the voltage
on the converter’s SC pin, VSC.
Where: VSC = voltage on SC pin
VNOM = the converter’s nominal output voltage
VHR = the voltage drop across the filter
VREF = the converter’s internal reference voltage
IDN and I can be calculated using the following equations:
RSCSET is calculated by dividing the headroom voltage drop
by the ISC current:
Or
Calculating the RSL resistor:
The current generated by the QPO-1’s SC circuit is based on
the headroom voltage drop across the filter. During start-up,
before the system has had a chance to stabilize, the voltage
drop across the QPO-1 can be much greater than the desired,
pre-programmed, headroom voltage drop. The higher
headroom voltage will generate a higher SC current and can
over-drive a converter so that it faults due to an over-voltage
on its output. Typically, a converter’s output can be trimmed
up to 110% of its nominal value.
The RSL resistor is used limit the amount of current the QPO-
1 can source during start-up. The compliance voltage of the
QPO-1’s SC circuit is about 8V greater than the QPO-1’s input
voltage. The maximum current the converter’s SC circuit
should see, based on 110% maximum trim-up, would be:
The minimum RSL resistor value can be calculated using this
IMAX limit as follows:
Filter Calculator Program
Picor has developed a standalone calculator, shown in Figure
17, which calculates all the required external components for
a variety of filters and converters. It will work with either SC
controlled or remote sensing topologies; with any of Vicor
brick converters or any other manufacturers’ converters with
similar SC/Trim circuits.
Figure 17 - Output Filter calculator
The user selects the converter type and QPO-1 filter then
enters the nominal converter output voltage, the voltage on
the QPO-1’s output and the headroom voltage drop. The
program will calculate all the resistors needed, to the closest
1% value, for this particular configuration.
This program is a Windows based executable file and is
available from your local Vicor FAE or sales representative.
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