參數(shù)資料
型號(hào)： R1234D191B
廠商： Ricoh Co., Ltd.
英文描述： PWM/VFM Step-Down DC/DC CONVERTER with Synchronous Rectifier
中文描述： 脈寬調(diào)制/ VFM的降壓型DC / DC同步整流變換器
文件頁(yè)數(shù)： 13/26頁(yè)
文件大小： 876K
代理商： R1234D191B
R1234D
13
In the continuous mode, when Equation 1 is solved for ton and assumed that the solution is tonc
tonc
=
t
×
V
OUT
/V
IN
.............................................................................................................Equation 2
When ton<tonc, the mode is the discontinuous mode, and when ton
=
tonc, the mode is the continuous mode.
OUTPUT CURRENT AND SELECTION OF EXTERNAL COMPONENTS
When P-channel Tr. of L
X
is ON:
(Wherein, Ripple Current P-P value is described as I
RP
, ON resistance of P-channel Tr. and N-channel Tr. of L
X
are respectively described as R
ONP
and R
ONN
, and the DC resistor of the inductor is described as R
L
.)
V
IN
=
V
OUT
+
(R
ONP
+
R
L
)
×
I
OUT
+
L
×
I
RP
/ton..............................................................................Equation 3
When P-channel Tr. of L
X
is "OFF"(N-channel Tr. is "ON"):
L
×
I
RP
/toff
=
V
F
+
V
OUT
+
R
ONN
×
I
OUT
.......................................................................................Equation 4
Put Equation 4 to Equation 3 and solve for ON duty of P-channel transistor, Don
=
ton/(toff
+
ton),
D
ON
=
(V
OUT
R
ONN
×
I
OUT
+
R
L
×
I
OUT
)/(V
IN
+
R
ONN
×
I
OUT
R
ONP
×
I
OUT
) ...........................................Equation 5
Ripple Current is as follows;
I
RP
=
(V
IN
V
OUT
R
ONP
×
I
OUT
R
L
×
I
OUT
)
×
D
ON
/fosc/L..............................................................Equation 6
wherein, peak current that flows through L, and L
X
Tr. is as follows;
ILmax
=
I
OUT
+
I
RP
/2 ..........................................................................................................Equation 7
Consider ILmax, condition of input and output and select external components.
ì
The above explanation is directed to the calculation in an ideal case in continuous mode.
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