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參數(shù)資料
| 型號(hào)： | R1282D002A-TR |
| 廠商： | RICOH COMPANY LTD |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 2CH PWM DC/DC CONTROLLER |
| 中文描述： | DUAL SWITCHING CONTROLLER, 805 kHz SWITCHING FREQ-MAX, PDSO10 |
| 封裝： | 0.90 MM HEIGHT, TSON-10 |
| 文件頁數(shù)： | 9/18頁 |
| 文件大小： | 327K |
| 代理商： | R1282D002A-TR |
R1282D002A
Output Current and Selection of External Components
9
There are also two modes, or discontinuous mode and continuous mode for the PWM step-down 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
V
OUT
the
current is (V
IN
V
OUT
)
×
t/L.
Therefore, the electric power, P, which is supplied from the input side, can be described as in next formula.
P
=
∫
0
Thus average electric power in one cycle, P
AV
is described as in the next formula.
P
AV
=
1/(Ton
+
Toff)
∫
0
This electric power P
AV
equals to output electric power V
OUT
×
I
OUT
, thus,
I
OUT
=
V
IN
/ V
OUT
×
(V
IN
V
OUT
)′Ton
2
/(2
×
L
×
(Ton
+
Toff))................................................. Formula 11
When I
OUT
increases and the current flows through the inductor continuously, then the mode becomes
continuous. In the continuous mode, the deviation of the current equals between Ton and Toff, therefore,
(V
IN
V
OUT
)
×
Ton/L
=
V
OUT
×
Toff/L ..................................................................................Formula 12
In this moment, the current flowing continuously through L, is assumed as Iconst, I
OUT
is described as in the
next formula:
I
OUT
=
I
CONST
+
V
OUT
×
Toff /(2
×
L).........................................................................................Formula 13
In this moment, the peak current, IL
X
max flowing through the inductor and the driver Tr. is described as
follows:
IL
X
max
=
I
OUT
+
V
OUT
×
Toff/(2
×
L).....................................................................................Formula 14
With the formula 12,13, ILxmax is,
Toff
=
(1
V
OUT
/V
IN
)/fosc..................................................................................................Formula 15
Therefore, peak current is more than I
OUT
. Considering the value of ILXmax, the condition of input and output,
and external components should be selected.
In the formula 14, 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 L
X
switch and external
components is not included.
V
(V
IN
V
OUT
)
t/ L dt ........................................................................................Formula 9
IN
V
(V
IN
V
OUT
)
t/ L dt
=
V
IN
(V
IN
V
OUT
)
Ton
2
/ (2
L (Ton
+
Toff))
....Formula 10
IN
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