參數(shù)資料
型號(hào)： RH5RI501B
廠商： Ricoh Co., Ltd.
英文描述： VFM STEP-UP DC/DC CONVERTER
中文描述： 衡工量值式升壓型DC / DC變換器
文件頁(yè)數(shù)： 12/24頁(yè)
文件大小： 179K
代理商： RH5RI501B
11
RH5RI
When LxTr is on, the energy P
ON
charged in the inductor is provided by Equation 2 as follows :
P
ON
=
∫
0
ton
(V
IN
· IL (t)) dt=
∫
=V
IN
2
· ton
2
/(2 · L)....................................................................................................Equation 2
ton
(V
IN
2
· t/L) dt
In the case of the step-up DC/DC converter, the energy is also supplied from the input power source at the time
of OFF.
Thus, P
OFF
=
∫
0
topen
(V
IN
· IL (t)) dt=
∫
0
=V
IN
· (V
OUT
–V
IN
) · topen
2
/(2 · L)
topen
(V
IN
· (V
OUT
–V
IN
)· t/L)dt
Here, topen=V
IN
· ton/(V
OUT
–V
IN
) from Equation 1, and when this is substituted into the above equation.
=V
IN
3
· ton
2
/(2 · L· (V
OUT
–V
IN
))............................................................................Equation 3
Input power P
IN
is (P
ON
+P
OFF
)/T. When this is converted in its entirely to the output.
P
IN
=(P
ON
+P
OFF
)/T=V
OUT
· I
OUT
=P
OUT
.........................................................................Equation 4
Equation 5 can be obtained as follows by solving Equation 4 for I
OUT
by substituting Equation 2 and 3 into
Equation 4 :
I
OUT
=V
IN
2
· ton
2
/(2· L· T· (V
OUT
–V
IN
)
=V
IN
2
· maxdty
2
/(20000 · fosc · L · (V
OUT
–V
IN
))...................................................Equation 5
The peak current which flows through L· LxTr · SD is
ILmax=V
IN
· ton/L..........................................................................................................Equation 6
Therefore, it is necessary that the setting of the input/output conditions and the selection of peripheral compo-
nents be made with ILmax taken into consideration.
SELECTION OF PERIPHERAL COMPONENTS
The above explanation is directed to the calculation in an ideal case where it is supposed that there is no
energy loss in the external components and LxSW. In an actual case, the maximum output current will be 50
to 80% of the above calculated maximum output current. In particular, care must be taken because V
IN
is
decreased in an amount corresponding to the voltage reduction caused by LxSW when IL is large or V
IN
is
small. Furthermore, It is required that with respect to V
OUT
, Vf of the diode (about 0.3V in the case of a
Schottky type diode) be taken into consideration.
When I
LX
and V
LX
exceed their respective ratings, use RH5RI
××
2B and RH5RI
××
3B ICs with the attach-
ment of an external transistor with a low saturation voltage thereto.
HINTS
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參數(shù)描述
RH5RI501B-T1 制造商:RICOH 制造商全稱:RICOH electronics devices division 功能描述:VFM STEP-UP DC/DC CONVERTER
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RH5RI502B-T1 制造商:RICOH 制造商全稱:RICOH electronics devices division 功能描述:VFM STEP-UP DC/DC CONVERTER
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