PICOR Corporation picorpower.com QPO-1 <" />
參數(shù)資料
型號(hào): QPO-1LZ-01
廠商: Vicor Corporation
文件頁(yè)數(shù): 2/17頁(yè)
文件大?。?/td> 0K
描述: IC INTERFACE FILTER
標(biāo)準(zhǔn)包裝: 20
系列: Picor®, QUIETPOWER®
其它名稱: 1102-1095-5
PICOR Corporation picorpower.com
QPO-1
Rev 3.6
Page 10 of 17
QPO-1
QUIETPOWER
Converter Output Voltage Trimming:
Trimming “UP” using Remote Sense
Figure 15 - Trimming a converter using remote sensing.
When trimming up a converter in a remote sense
configuration, the designer must be aware that the voltage
the trim-up resistor is connected to, the output of the
converter, is not just the desired trim-up voltage but also the
headroom voltage of the filter. The voltage programmed on
the converter’s SC pin is based on just the trimmed up
voltage alone. To calculate the RUP resistor use the following
equation:
Where: RUP = trim up resistor
VNOM = nominal converter output voltage
VOUT = desired output voltage, seen on QPO-1’s
output
VHR = headroom voltage drop across the QPO-1
VREF = converter’s internal reference voltage
RREF = converter’s internal series resistor
Trimming “Down” using Remote Sense or SC control
When trimming down a converter, in either remote sense or
SC control, there are no other voltage drops to take into
consideration so the equation to calculate a trim down
resistor is:
Where: RDN = trim down resistor
VNOM = nominal converter output voltage
VOUT = desired output voltage, seen on QPO-1’s
output
RREF = converter’s internal series resistor
Trimming “UP” using SC control
When trimming up a converter using SC control, as is shown
in Figure 16, the designer would calculate the trim-up resistor
based on the designed trimmed up voltage without regard for
the headroom voltage drop. The QPO-1’s SC circuit will adapt
the converter’s output for the additional headroom voltage
drop of the filter.
Where: RUP = trim up resistor
VNOM = nominal converter output voltage
VOUT = desired output voltage, seen on QPO-1’s
output
VREF = converter’s internal reference voltage
RREF = converter’s internal series resistor
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