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參數(shù)資料
| 型號： | QPO-1LZ-01 |
| 廠商： | Vicor Corporation |
| 文件頁數(shù)： | 3/17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 11 of 17
QPO-1
QUIETPOWER
Calculating RSCSET
Figure 16 – Trimming a converter using SC control.
With a Trim up resistor
Once the value of the trim-up resistor is known, the SCSET
resistor can be calculated using the following equation:
Where: RSCSET = ISC programming resistor
VHR = QPO-1’s headroom voltage drop
ISC = current sourced into the SC/Trim pin of the
converter to adapt its output voltage for the
headroom voltage drop of the QPO-1
ISC is the current generated by the QPO-1 that, in addition
with the current from the RUP resistor, adapts the
converter’s SC pin to the proper voltage to generate a
trimmed up output voltage plus the QPO-1’s headroom
voltage. ISC can be calculated by subtracting the RUP current
from the total current required by the SC reference pin.
Where: ISC = QPO-1 generated current
ITOT = Total current required by the SC reference for
trimming
IUP = current provided by the trim up resistor
ITOT can be calculated by subtracting the original reference
voltage of the SC pin from the trimmed up value, VSC, and
then dividing by the series reference resistor. VSC can be
calculated by dividing the converter’s output voltage
(VOUT+VHR) by the overall gain of the converter,
VNOM/VREF. IUP is the difference in voltage between the
converter’s output and the converter’s SC voltage, divided by
the RUP resistor.
Where: ITOT = Total current required by the SC reference for
trimming
VSC = converter’s SC/Trim pin voltage
IUP = current provided by the trim up resistor
Combining these equations, the equation for RSCSET
becomes:
With a Trim down resistor
The addition of a trim-down resistor sinks current out of the
SC pin of the converter, lowering the voltage on the pin due
to the voltage drop across the internal series resistor. The SC
circuit of the QPO must now source current into the RDN
resistor to reduce the amount of current being sourced by
the converter’s SC circuit and raise the voltage on the
converter’s SC pin to increase the converter’s output voltage.
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