參數(shù)資料
型號(hào)： S-8331
廠商： Seiko Instruments Inc.
英文描述： Step-Up Switching Regulator For LCD Bias Supply(用于LCD偏置電源的步升開(kāi)關(guān)穩(wěn)壓器)
中文描述： 升壓型開(kāi)關(guān)LCD偏置電源穩(wěn)壓器（用于液晶偏置電源的步升開(kāi)關(guān)穩(wěn)壓器）
文件頁(yè)數(shù)： 10/35頁(yè)
文件大?。?/td> 324K
代理商： S-8331
STEP-UP SWITCHING REGULATOR FOR LCD BIAS SUPPLY
Rev.2.8
S-8330/8331
Series
Seiko Instruments Inc.
9
V
L
:
The pin voltage at CONT rises only by the voltage corresponding to V
OUT
+V
D
.
A change in the current (I
L
) which flows through a diode into V
OUT
during t
OFF
:
Integration of the above equation is as follo ws :
During t
ON
, the energy is stored in L and is not transmitted to V
OUT
. When output current (I
OUT
) flows from V
OUT
, the energy
of the capacitor (C
OUT
) is consumed. As a result, the pin voltage at C
OUT
decreases and goes to the lowest value after t
ON
.
When M1 is turned OFF, the energy stored in L is transmitted through a diode into C
OUT
, and the pin voltage at C
OUT
rises
drastically. V
OUT
is a time function that indicates the maximum value (ripple voltage V
P-P
) when the current flowing into V
OUT
through diode and load current I
OUT
match. Next, the ripple voltage is found out based on the following equations:
I
OUT
when the time is set to t
1
until V
OUT
reaches the maximum level immediately after t
ON
:
t
OFF
when I
L
=0 (the energy of the inductor is completely transmitted). Based on equation (7)
When substituting equation (10) for equation (9):
Electric charge (
￠
Q
1
) which is charged in C
OUT
during t
1
:
When substituting equation (12) for equation (9):
A rise in voltage (V
P-P
) due to
Q
1
:
=
=
...................................................... (6)
dI
L
dt
V
L
L
V
OUT
+V
D
- V
IN
L
I
L
=I
PK
-
t ............................................................ (7)
=
.......................................................... (10)
.............................................. (5)
V
L
= (V
OUT
+V
D
) - V
IN
t
1
=t
OFF
-
t
OFF
........................................................... (11)
(V
D
: Diode forward voltage)
Q
1
=
∫
I
L
dt=I
PK
∫
dt -
∫
tdt
=I
PK
t
1
-
t
1
2
..................................... (12)
t
1
0
V
OUT
+V
D
- V
IN
L
V
OUT
+V
D
- V
IN
L
2
1
0
t
0
t
1
Q
1
=I
PK
-
(I
PK
- I
OUT
) t
1
=
t
1
............................... (13)
2
1
2
I
PK
+I
OUT
V
P-P
=
=
t1
.............................. (14)
C
OUT
Q
1
C
OUT
1
I
OUT
=I
PK
-
t
1
.................................................... (8)
∴
t
1
= (I
PK
- I
OUT
)
................................................ (9)
L
V
OUT
+V
D
- V
IN
L
V
OUT
+V
D
- V
IN
V
OUT
+V
D
- V
IN
L
V
OUT
+V
D
- V
IN
L
I
PK
t
OFF
I
PK
I
OUT
2
I
PK
+I
OUT
相關(guān)PDF資料
PDF描述
S-8340 PWM Control High-Frequency Step-Up Switching Regulator-Controllers(PWM控制，高頻步升開(kāi)關(guān)穩(wěn)壓器-控制器)
S-8340A PWM Control High-Frequency Step-Up Switching Regulator-Controllers(PWM控制，高頻步升開(kāi)關(guān)穩(wěn)壓器-控制器)
S-8340B PWM Control High-Frequency Step-Up Switching Regulator-Controllers(PWM控制，高頻步升開(kāi)關(guān)穩(wěn)壓器-控制器)
S-8341 PWM/PFM Control High-Frequency Step-Up Switching Regulator-Controllers(PWM/PFM控制，高頻步升開(kāi)關(guān)穩(wěn)壓器-控制器)
S-8341A PWM/PFM Control High-Frequency Step-Up Switching Regulator-Controllers(PWM/PFM控制，高頻步升開(kāi)關(guān)穩(wěn)壓器-控制器)
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