參數(shù)資料
型號(hào)： 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(yè)數(shù)： 3/20頁(yè)
文件大?。?/td> 363K
代理商： R1215D002F-TR-F
R1215D
11
In the continuous mode, the deviation of the current is equal between on time and off time.
L
/
toff
)
V
(
L
/
t
V
IN
OUT
ON
IN
×
=
................................................................................ Formula 4
Further, the electric power, PAV is equal to output electric power, VOUT
× IOUT, thus,
{}
)
V
L
2
/(
t
V
)
V
(
L
2
/
t
V
f
I
OUT
ON
2
IN
OUT
2
ON
2
IN
OSC
OUT
×
=
×
=
....................... Formula 5
When IOUT becomes more than formula 5, the current flows through the inductor, then the mode becomes
continuous. The continuous current through the inductor is described as Iconst, then,
{}
OUT
IN
OUT
2
ON
2
IN
OSC
OUT
V
/
Iconst
V
)
V
(
L
2
/
t
V
f
I
×
+
×
=
................................. Formula 6
In this moment, the peak current, ILxmax flowing through the inductor and the driver Tr. is described as
follows:
L
/
t
V
Iconst
max
ILx
ON
IN
×
+
=
...................................................................................... Formula 7
With the formula 4,6, and ILxmax is,
)
L
2
/(
t
V
I
V
/
V
max
ILx
ON
IN
OUT
IN
OUT
×
+
×
=
................................................................. Formula 8
Therefore, peak current is more than IOUT. Considering the value of ILxmax, the condition of input and output,
and external components should be selected.
In the formula 7, peak current ILxmax at discontinuous mode can be calculated. Put Iconst
=0 in the formula.
The explanation above is based on the ideal calculation, and the loss caused by LX switch and external
components is not included. The actual maximum output current is between 50% and 80% of the calculation.
Especially, when the ILX is large, or VIN is low, the loss of VIN is generated with the on resistance of the switch. As
for VOUT, Vf (as much as 0.3V) of the diode should be considered.
相關(guān)PDF資料
PDF描述
R1215D002A-TR-F 0.08 A SWITCHING CONTROLLER, 700 kHz SWITCHING FREQ-MAX, PDSO8
R1218K042A-TR 1 A SWITCHING REGULATOR, 1400 kHz SWITCHING FREQ-MAX, DSO6
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R1223N3.62E-TR Analog IC
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