參數(shù)資料
型號(hào)： S-8333ABBB-T8T1G
元件分類： 穩(wěn)壓器
英文描述： 0.16 A SWITCHING CONTROLLER, 1133 kHz SWITCHING FREQ-MAX, PDSO8
封裝： LEAD FREE, TSSOP-8
文件頁(yè)數(shù)： 5/43頁(yè)
文件大?。?/td> 588K
代理商： S-8333ABBB-T8T1G
STEP-UP, FOR LCD BIAS SUPPLY, 1-CHANNEL, PWM CONTROL SWITCHING REGULATOR CONTROLLER
Rev.2.3_00
S-8333 Series
Seiko Instruments Inc.
13
Change in current (IL) flowing through the diode into VOUT during tOFF:
L
V
L
V
dt
dI
IN
D
OUT
L
+
=
................................................................................................................. (6)
Integration of the above equation is as follows:
t
L
V
I
IN
D
OUT
PK
L
+
=
............................................................................................................... (7)
During tON, energy is stored in L and is not transmitted to VOUT. When receiving output current (IOUT) from VOUT,
the energy of the capacitor (CL) is used. As a result, the pin voltage of CL is reduced, and goes to the lowest level
after M1 is turned ON (tON). When M1 is turned OFF, the energy stored in L is transmitted via the diode to CL, and
the pin voltage of CL rises drastically. Because VOUT is a time function indicating the maximum value (ripple
voltage: Vp-p) when the current flowing through the diode into VOUT and the load current IOUT match.
Next, this ripple voltage is determined as follows.
IOUT vs t1 (time) from after tON, when VOUT reaches the maximum level:
1
IN
D
OUT
PK
OUT
t
L
V
I
+
=
.......................................................................................................... (8)
()
+
=
∴
IN
D
OUT
PK
1
V
L
I
t
......................................................................................................... (9)
When tOFF, IL = 0 (when the energy of the inductor is completely transmitted):
Based on equation (7),
PK
OFF
IN
D
OUT
I
t
V
L
=
+
............................................................................................................ (10)
When substituting equation (10) for equation (9):
OFF
PK
OUT
OFF
1
t
I
t
=
.................................................................................................................... (11)
Electrical charge
Q1 which is charged in CL during t1:
2
1
IN
D
OUT
1
PK
1
t
0
IN
D
OUT
1
t
0
PK
1
t
0
L
1
t
2
1
L
V
t
I
tdt
L
V
dt
I
dt
I
Q
+
=
+
=
∫
................. (12)
When substituting equation (12) for equation (9):
()
1
OUT
PK
1
OUT
PK
1
t
2
I
t
I
2
1
I
Q
+
=
=
................................................................................... (13)
A rise voltage (Vp-p) due to
Q1:
1
OUT
PK
L
1
P
t
2
I
C
1
C
Q
V
+
=
=
................................................................................................... (14)
When taking into consideration IOUT consumed during t1 and ESR
*1 (RESR) of CL:
L
1
OUT
ESR
OUT
PK
1
OUT
PK
L
1
P
C
t
I
R
2
I
t
2
I
C
1
C
Q
V
+
+
=
=
.............................................. (15)
*1.
Equivalent Series Resistance
When substituting equation (11) for equation (15):
ESR
OUT
PK
L
OFF
PK
2
OUT
PK
P
R
2
I
C
t
I
2
)
I
(I
V
+
=
........................................................................... (16)
Therefore to reduce the ripple voltage, it is important that the capacitor connected to the output pin has a large
capacity and a small ESR.
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