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| 型號(hào)： | R1201N051A-TR-FE |
| 廠商： | RICOH COMPANY LTD |
| 元件分類(lèi)： | 穩(wěn)壓器 |
| 英文描述： | SWITCHING REGULATOR, 1400 kHz SWITCHING FREQ-MAX, PDSO6 |
| 封裝： | HALOGEN FREE AND ROHS COMPLIANT, SOT-23, 6 PIN |
| 文件頁(yè)數(shù)： | 17/17頁(yè) |
| 文件大?。?/td> | 352K |
| 代理商： | R1201N051A-TR-FE |
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R1201x
9
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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