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參數(shù)資料
| 型號： | R1215D002F-TR-F |
| 廠商： | RICOH COMPANY LTD |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 0.08 A SWITCHING CONTROLLER, 1400 kHz SWITCHING FREQ-MAX, PDSO8 |
| 封裝： | ROHS COMPLIANT, SON-8 |
| 文件頁數(shù)： | 2/20頁 |
| 文件大?。?/td> | 363K |
| 代理商： | R1215D002F-TR-F |
R1215D
10
Output Current and Selection of External Components
<Basic Circuit>
Inductor
Diode
CL
Lx Tr
VIN
VOUT
IOUT
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 VIN, the current is
VIN
× t/L. Therefore, the electric power, PON, which is supplied with input side, can be described as in next
formula.
dt
L
/
t
V
P
2
IN
ton
0
ON
×
=
∫
...................................................................................................Formula 1
With the step-up circuit, electric power is supplied from power source also during off time. In this case, input
current is described as (VOUT
VIN) ×t/L, therefore electric power, POFF is described as in next formula.
dt
L
/
t
)
V
(
V
P
IN
OUT
IN
tf
0
OFF
×
×
=
∫
.............................................................................Formula 2
In this formula, Tf means the time of which the energy saved in the inductance is being emitted. Thus average
electric power, or PAV is described as in the next formula.
}
dt
L
/
t
)
V
(
V
dt
L
/
t
V
{
)
t
/(
1
P
IN
OUT
IN
tf
0
2
IN
ton
0
OFF
ON
AV
×
×
+
×
+
=
∫
............................Formula 3
In PWM control, when tf
= toff is true, the inductor current becomes continuos, then the operation of switching
regulator becomes continuous mode.
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