参数资料
型号: RP400K181C-TR-F
厂商: RICOH COMPANY LTD
元件分类: 稳压器
英文描述: SWITCHING REGULATOR, 805 kHz SWITCHING FREQ-MAX, DSO6
封装: 1.80 X 2 MM, LEAD FREE, DFN-6
文件页数: 3/15页
文件大小: 248K
代理商: RP400K181C-TR-F
RP400x
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/LFormula 4
Further, the electric power, PAV is equal to output electric power, VOUT × IOUT , thus,
IOUT = fosc×VIN
×ton
2 /{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 / LFormula 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).
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