參數(shù)資料
型號(hào)： R1212D100B
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(yè)數(shù)： 12/41頁(yè)
文件大小： 690K
代理商： R1212D100B
R1212D
Output Current and Selection of External Components
12
<Basic Circuit>
Inductor
Diode
CL
Lx Tr
V
IN
V
OUT
I
OUT
i1
i2
<Circuit through L>
Discontinuous Mode
Continuous Mode
ILxmax
ILxmin
Ton
Toff
T=1/fosc
1/ton
Tf
IL
t
ILxmax
ILxmin
Ton
T=1/fosc
1/ton
Toff
IL
Iconst
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
×
.....................................................................................................Formula 1
dt
L
/
V
P
2
IN
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.
Tf
IN
OFF
×
×
................................................................................Formula 2
dt
L
/
)
V
V
(
V
P
IN
OUT
0
=
∫
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
IN
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
V
(
V
dt
L
/
V
{
)
T
T
/(
1
P
IN
OUT
0
2
Ton
OFF
ON
AV
×
×
+
×
×
+
=
...............................Formula 3
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