參數(shù)資料
型號： S-8351A28MC-J2NT2G
元件分類： 穩(wěn)壓器
英文描述： SWITCHING REGULATOR, 110 kHz SWITCHING FREQ-MAX, PDSO5
封裝： LEAD FREE, SOT-23, 5 PIN
文件頁數(shù)： 10/50頁
文件大?。?/td> 630K
代理商： S-8351A28MC-J2NT2G
STEP-UP, BUILT-IN / EXTERNAL FET PFM CONTROL SWITCHING REGULATOR / SWITCHING REGULATOR CONTROLLER
S-8351/8352 Series
Rev.2.4_00
Seiko Instruments Inc.
18
Integration of the equation (6) is as follows :
t
L
V
I
IN
D
OUT
PK
L
+
=
(7)
During tON, the energy is stored in L and is not transmitted to VOUT. When receiving the output current (IOUT) from
VOUT, the energy of the capacitor (CL) is consumed. 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 through the
diode to CL, and the voltage of CL rises rapidly. VOUT is a time function, and therefore indicates the maximum value
(ripple voltage (VPP) ) when the current flowing through into VOUT and load current (IOUT) match.
Next, the ripple voltage is determined as follows.
IOUT vs. t1 (time) from when M1 is turned OFF (after tON) to 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 M1 is turned OFF (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)
Electric 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
L
1
t
0
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
t
2
I
t
I
2
1
I
1
Q
+
=
=
(13)
A rise in voltage (VPP) due to Q 1 :
1
OUT
PK
L
1
P
t
2
I
C
1
C
Q
V
+
=
(14)
When taking into consideration IOUT to be consumed during t1 and the Equivalent Series Resistance (RESR) of CL :
L
1
OUT
ESR
OUT
PK
OUT
PK
L
1
P
C
t
I
R
2
I
1
t
2
I
C
1
C
Q
V
+
+
=
=
(15)
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
(
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 RESR.
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