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參數(shù)資料
| 型號： | R1202L511B-TR |
| 廠商： | RICOH COMPANY LTD |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 0.45 A SWITCHING REGULATOR, 1400 kHz SWITCHING FREQ-MAX, PDSO6 |
| 封裝： | 1.60 X 1.60 MM, HALOGEN FREE AND ROHS COMPLIANT, DFN-6 |
| 文件頁數(shù)： | 5/23頁 |
| 文件大?。?/td> | 572K |
| 代理商： | R1202L511B-TR |
R1202x
13
OPERATION OF STEP-UP DC/DC CONVERTER AND OUTPUT CURRENT
<Basic Circuit>
L
Diode
CL
Lx Tr
VIN
VOUT
IOUT
i2
i1
GND
VOUT
<Current through L>
Discontinuous mode
Continuous mode
ILmax
ILmin
ton
toff
T=1/fosc
topen
IL
t
ILmax
ILmin
ton
toff
T=1/fosc
IL
Iconst
t
There are two operation modes of the step-up PWM control-DC/DC converter. That is the continuous mode and
discontinuous mode by the continuousness inductor.
When the transistor turns ON, the voltage of inductor L becomes equal to VIN voltage. The increase value of
inductor current (i1) will be
Δi1 = VIN × ton / L .................................................................................................. Formula 1
As the step-up circuit, during the OFF time (when the transistor turns OFF) the voltage is continually supply
from the power supply. The decrease value of inductor current (i2) will be
i2 = (VOUT - VIN)
× topen / L................................................................................... Formula 2
At the PWM control-method, the inductor current become continuously when topen
=toff, the DC/DC converter
operate as the continuous mode.
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