參數(shù)資料
型號(hào)： S-8328
廠商： Seiko Instruments Inc.
英文描述： CMOS PWM/PFM-Control Step-Up Switching Regulator(CMOS PWM/PFM控制步升開(kāi)關(guān)穩(wěn)壓器)
中文描述： 的CMOS PWM / PFM切換，控制升壓型開(kāi)關(guān)穩(wěn)壓器的CMOS（PWM / PFM切換控制步升開(kāi)關(guān)穩(wěn)壓器）
文件頁(yè)數(shù)： 12/68頁(yè)
文件大小： 647K
代理商： S-8328
SMALL PACKAGE PWM/PFM CONTROL STEP-UP SWITCHING REGULATOR
S-8324/8328 Series
Seiko Instruments Inc.
11
The energy stored in L is represented with 1/2 L (I
PK
)
2
.
When M1 is turned OFF (t
OFF
), the energy stored in L is transmitted through a diode to the output capacitor. Then reverse
voltage (V
L
) is generated.
V
L
= (V
OUT
+V
D
) - V
IN
...........................................................................(5)
(V
D
: Diode forward voltage)
The voltage at CONT pin rises only by the voltage corresponding to V
OUT
+V
D
.
The change in the current flowing through the diode into V
OUT
during t
OFF
:
Integration of the above equation is as follows:
I
L
=I
PK
-
t............................................................(7)
During t
ON
, the energy is stored in L and is not transmitted to V
OUT
. When receiving output current (I
OUT
) from V
OUT
, the
energy of the capacitor (C
OUT
) is consumed. As a result, the pin voltage of C
OUT
is reduced, and goes to the lowest level after
M1 is turned ON (t
ON
). When M1 is turned OFF, the energy stored in L is transmitted through the diode to C
OUT
, and the
voltage of C
OUT
rises drastically. V
OUT
is a time function that indicates the maximum value (ripple voltage: V
P-P
) when the
current flowing through the diode into V
OUT
and load current (I
OUT
) match.
Next, the ripple voltage is found out as follows:
I
OUT
vs t
1
(time) from when M1 is turned OFF ( after t
ON
) to when
V
OUT
reaches the maximum level:
After (t
OFF
), I
L
=0 (when the energy of the inductor is completely transmitted). Based on equation (7),
=
..........................................................(10)
When substituting equation (10) for equation (9),
t
1
=t
OFF
-
t
OFF
..........................................................................(11)
Electric charge
Q1 which is charged in C
OUT
during t1:
Q
1
=
∫
I
l
dt = I
PK
∫
dt -
0
∫
tdt
=I
PK
t
1
-
t
1
2
........................................................(12)
When substituting equation (12) for equation (9):
Q
1
=I
PK
-
(I
PK
- I
OUT
) t
1
=
t
1
............................................ (13)
A rise in voltage (V
P-P
) due to
Q1:
V
P-P
=
=
t1............................................(14)
When taking into consideration I
OUT
to be consumed during t1 and ESR (Electric Series Resistance) of C
OUT
, namely R
ESR
:
V
P-P
=
=
t1 +
R
ESR
-
.............. (15)
=
=
.......................................................... (6)
dI
L
dt
V
L
L
V
OUT
+V
D
- V
IN
L
V
OUT
+V
D
- V
IN
L
I
OUT
=I
PK
-
t
1
.......................................................(8)
∴
t
1
= (I
PK
- I
OUT
)
.............................................(9)
V
OUT
+V
D
- V
IN
L
V
OUT
+V
D
- V
IN
L
V
OUT
+V
D
- V
IN
L
I
PK
t
OFF
I
PK
I
OUT
V
OUT
+V
D
- V
IN
L
2
1
t
1
V
OUT
+V
D
- V
IN
L
1
0
t
1
2
1
2
I
PK
+I
OUT
C
OUT
Q
1
C
OUT
1
2
I
PK
+I
OUT
C
OUT
Q
1
C
OUT
1
2
I
PK
+I
OUT
C
OUT
I
OUT
- t
1
2
I
PK
+I
OUT
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