參數(shù)資料
型號(hào): RP400K441A-TR
廠商: RICOH COMPANY LTD
元件分類: 穩(wěn)壓器
英文描述: 0.8 A SWITCHING REGULATOR, 805 kHz SWITCHING FREQ-MAX, PDSO6
封裝: 1.80 X 2 MM, HALOGEN FREE AND ROHS COMPLIANT, DFN-6
文件頁數(shù): 3/16頁
文件大小: 461K
代理商: RP400K441A-TR
RP400xxx1A Series
11
In PWM control, when tf = toff is true, the inductor current becomes continuous, then the operation of switching
regulator becomes continuous mode. In the continuous mode, the deviation of the current is equal between on
time and off time.
VIN × ton / L = (VOUT – VIN) × toff / L Formula 4
Further, the electric power, PAV is equal to output electric power, VOUT × IOUT, thus,
IOUT = fosc × VIN
2 × ton2 /{2 × L (VOUT – VIN)} = VIN2 × ton / (2 × L × VOUT) Formula 5
When IOUT becomes more than VIN × ton × toff / (2 × L × (ton + toff)), the current flows through the inductor,
then the mode becomes continuous. The continuous current through the inductor is described as lconst, then,
IOUT = fosc × VIN
2 × ton2 / (2 × L × (VOUT – VIN)) + VIN × Iconst / VOUT Formula 6
In this moment, the peak current, Ilxmax flowing through the inductor and the driver Tr. Is described as follows:
Ilxmax = Iconst + VIN × ton / L Formula 7
With the formula 4, 6 and Ilxmax is
Ilxmax = VOUT / VIN × IOUT + VIN × ton / (2 × L) Formula 8
However, ton = (1 – VIN / VOUT) / fosc
Therefore, peak current is more than IOUT. Considering the value of Ilxmax, the condition of input and output,
and external components should be selected.
In the formula 7, peak current Ilxmax at discontinuous mode can be calculated. Put lconst = 0 in the formula.
The explanation above is based on the ideal calculation, and the loss caused by Lx switch and external
components is not included.
Please select the inductor and the diode with current peak to the standard (Formula 8).
相關(guān)PDF資料
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