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參數(shù)資料
| 型號(hào)： | R1282D002A |
| 廠商： | Ricoh Co., Ltd. |
| 英文描述： | 2CH PWM DC/DC CONTROLLER |
| 中文描述： | 2聲道的PWM DC / DC控制器 |
| 文件頁數(shù)： | 6/18頁 |
| 文件大小： | 327K |
| 代理商： | R1282D002A |
R1282D002A
Output Current and Selection of External Components
6
Output Current of Step-up Circuit and External Components
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
2
IN
ON
×
...................................................................................................Formula 1
dt
t/L
V
P
0
=
∫
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.
IN
OFF
×
...................................................................................Formula 2
dt
)t/L
V
(V
V
0
P
IN
OUT
=
∫
In this formula, Tf means the time of which the energy saved in the inductance is being emitted. Thus average
electric power, P
AV
is described as in the next formula.
Ton
2
IN
AV
+
×
×
+
=
∫
∫
In PWM control, when Tf
=
Toff is true, the inductor current becomes continuos, then the operation of switching
regulator becomes continuous mode.
In the continuous mode, the deviation of the current is equal between on time and off time.
V
IN
×
Ton/L
=
(V
OUT
V
IN
)
×
Toff/L..........................................................................................Formula 4
Further, the electric power, P
AV
is equal to output electric power, V
OUT
×
I
OUT
, thus,
I
OUT
=
f
OSC
×
V
IN
2
×
Ton
2
/{2
×
L
×
(V
OUT
V
IN
)}
=
V
IN
2
×
Ton/(2
×
L
×
V
OUT
)......................................Formula 5
When I
OUT
becomes more than V
IN
×
Ton
×
Toff/(2
×
L
×
(Ton
+
Toff)), the current flows through the inductor, then the
mode becomes continuous. The continuous current through the inductor is described as
Iconst, then,
I
OUT
=
f
OSC
×
V
IN
2
×
Ton
2
/(2
×
L
×
(V
OUT
V
IN
))
+
V
IN
×
Iconst/V
OUT
...............................................Formula 6
dt}
)t/L
V
(V
V
0
dt
t/L
V
{
Toff)
1/(Ton
P
IN
OUT
IN
0
×
............................Formula 3
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