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參數(shù)資料
| 型號： | R1215D002E |
| 廠商： | Ricoh Co., Ltd. |
| 英文描述： | STEP-UP DC/DC CONTOLLER |
| 中文描述： | 升壓型DC /直流位指示 |
| 文件頁數(shù)： | 10/22頁 |
| 文件大?。?/td> | 448K |
| 代理商： | R1215D002E |
R1215D
Output Current and Selection of External Components
10
<Basic Circuit>
Inductor
Diode
CL
Lx Tr
V
IN
V
OUT
I
OUT
i1
i2
GND
<Circuit through L>
Discontinuous Mode
Continuous Mode
ILxmax
ILxmin
ton
toff
t=1/fosc
1/ton
tf
IL
t
ILxmax
ILxmin
ton
toff
t=1/fosc
1/ton
IL
Iconst
t
There are two modes, or discontinuous mode and continuous mode for the PWM step-up switching regulator
depending on the continuous characteristic of inductor current.
During on time of the transistor, when the voltage added on to the inductor is described as V
IN
, the current is
V
IN
×
t/L. Therefore, the electric power, P
ON
, which is supplied with input side, can be described as in next
formula.
ton
ON
×
=
∫
With the step-up circuit, electric power is supplied from power source also during off time. In this case, input
current is described as (V
OUT
V
IN
)
×
t/L, therefore electric power, P
OFF
is described as in next formula.
tf
OFF
×
×
=
∫
In this formula, Tf means the time of which the energy saved in the inductance is being emitted. Thus average
electric power, or P
AV
is described as in the next formula.
tf
2
IN
0
∫
∫
In PWM control, when tf
=
toff is true, the inductor current becomes continuos, then the operation of switching
regulator becomes continuous mode.
dt
L
/
V
P
2
IN
0
...................................................................................................Formula 1
dt
L
/
)
V
V
(
V
P
IN
OUT
IN
0
.............................................................................Formula 2
}
dt
L
/
)
V
V
(
V
dt
L
/
V
{
)
t
t
/(
1
P
IN
OUT
IN
0
ton
OFF
ON
AV
×
×
+
×
×
+
=
............................Formula 3
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| R1215D002F | 制造商:RICOH 制造商全稱:RICOH electronics devices division 功能描述:STEP-UP DC/DC CONTOLLER |
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