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參數(shù)資料
| 型號： | R1285L311A |
| 廠商： | RICOH COMPANY LTD |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | SWITCHING REGULATOR, 1600 kHz SWITCHING FREQ-MAX, DSO12 |
| 封裝： | 2.70 X 3 MM, DFN-12 |
| 文件頁數(shù)： | 3/12頁 |
| 文件大?。?/td> | 241K |
| 代理商： | R1285L311A |
R1285L
11
There are two operation modes for the PWM control step-up switching regulator, that is the continuous mode
and the discontinuous mode.
When the LX Tr. is on, the voltage for the inductor L will be VIN. The inductor current (IL1) will be;
IL1 = VIN x Ton / L ...............................................................................................................Formula1
When the Lx transistor turns off, power will supply continuously. The inductor current at off (IL2) will be;
IL2 = (VOUT-VIN) x Tf / L .....................................................................................................Formula2
In terms of the PWM control, when the Tf=Toff, the inductor current will be continuous, the operation of the
switching regulator will be continuous mode.
In the continuous mode, the current variation of IL1 and IL2 are same, therefore
VIN x Ton / L = (VOUT-VIN) x Toff / L
....................................................................................Formula3
In the continuous mode, the duty cycle will be
DUTY = Ton / (Ton+Toff) = (VOUT-VIN) / VOUT ........................................................................Formula4
If the input power equals to output power,
IOUT = VIN
2 x T
on / (2 x L x VOUT)
.......................................................................................Formula5
When IOUT becomes more then Formula5, it will be continuous mode.
In this moment, the peak current, ILxmax flowing through the inductor is described as follows:
ILxmax = IOUT x VOUT / VIN + VIN x Ton /(2 x L)
..................................................................Formula6
ILxmax = IOUT x VOUT / VIN + VIN x Tx (VOUT-VIN) /(2 x L x VOUT)
.......................................Formula7
Therefore, peak current is more than IOUT. Considering the value of ILxmax, the condition of input and output,
and external components should be selected.
The explanation above is based on the ideal calculation, and the loss caused by Lx switch and external
components is not included.
The actual maximum output current is between 50% and 80% of the calculation.
Especially, when the IL is large, or VIN is low, the loss of VIN is generated with on resistance of the switch.
As for VOUT, VF(as much as 0.3V)of the diode should be considered.
Operation of Inverting DC/DC Converter and Output Current
<
Basic Circuit>
Inductor
Diode
CL
Lx Tr
VIN
VOUT
IOUT
IL1
IL2
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