參數(shù)資料
型號(hào)： S-8330
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)： 11/35頁(yè)
文件大?。?/td> 324K
代理商： S-8330
STEP-UP SWITCHING REGULATOR FOR LCD BIAS SUPPLY
S-8330/8331
Series Rev.2.8
10
Seiko Instruments Inc.
When taking into consideration ESR (Electric Series Resistance) R
ESR
of I
OUT
and C
OUT
during t
1
:
When substituting equation (15) for equation (11):
The effective methods to reduce the ripple voltage are to maximize the capacitance of the capacitor connected to the
output pin and to minimize ESR.
2.
Power off pin (ON/OFF pin)
This pin stops and starts set up operation.
Turnig the power off pin to
“
L
”
stops the operation of the internal circuits excluding the electric volume, minimizes current
consumption and short-curcuits V
OUT
pin to V
SS
. At this time, current flows via coils and a diode at the input side into V
SS
.
Therefore, a switch to cut off the current is needed.
Figure 6 shows a circuit example using the NEC 2SJ356 (Pch MOS FET) as a current cutting switch. This circuit example
turns ON and OFF the 2SJ356 in connection with the reset signal to the power off pin using a small signal transistor M
N
(Nch
MOS FET). A Zenor diode (ZD) is used for the purpose of clamping voltage so as not to apply high voltage ( 20V or more) of
the rated voltage between the gate and the source of the 2SJ356. However, when the circuit is used at 20 V or below, a
Zenor diode is not needed. Invalid current flowing into resistors R
A
, R
B
during step-up operation may affect the efficiency.
Set R
A
, R
B
to the maximum level. If you set the resistance of R
A
to the high value, a drop in the voltage occurs in resistor R
A
due to off current of M
N
and the current cutting switch 2SJ356 does not normally function. Be careful (Note that the efficiency
characteristics shown in the reference data were measured without attaching a current cutting switch and is different from
that shown in this example).
CONT
RESET
ON/OFF
M
N
2SJ356
R
B
:1M
ZD:15V
V
OUT
SBD
R
:
500k
V
SS
V
IN
L
-
+
CL
Figure 6 Circuit Example Using 2SJ356
The power off pin is configured as shown in Figure 7. DO NOT use this circuit under the floating state because the power
off pin is not internally pulled up nor pulled down. If 0.4V to 2.4V when V
IN
≥
3.0V, 0.4V to 1.6V when V
IN
<
3.0V are applied,
current consumption increases. DO NOT apply voltage. When the power off pin is not used, connect it to V
IN
pin.
The power off pin is not provided with hysteresis.
Power off pin
CR OSC
Output voltage
”H”
Operation
Setting value
”L”
Stop
V
SS
V
P-P
=
=
t1 +
R
ESR
-
..................... (15)
C
OUT
Q
1
C
OUT
1
V
P-P
=
+
R
ESR
............... (16)
2I
PK
(I
PK
- I
OUT
)
2
C
OUT
t
OFF
2
I
PK
+I
OUT
2
I
PK
+I
OUT
C
OUT
I
OUT
t
1
2
I
PK
+I
OU
Figure 7
ON/OFF
V
IN
V
SS
相關(guān)PDF資料
PDF描述
S-8331 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)
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)
相關(guān)代理商/技術(shù)參數(shù)
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S-8330A20FS-T2 功能描述:開(kāi)關(guān)變換器、穩(wěn)壓器與控制器 8-20V 100uA 2.4% RoHS:否 制造商:Texas Instruments 輸出電壓:1.2 V to 10 V 輸出電流:300 mA 輸出功率: 輸入電壓:3 V to 17 V 開(kāi)關(guān)頻率:1 MHz 工作溫度范圍: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:WSON-8 封裝:Reel
S-8330A20FS-T2-G 功能描述:開(kāi)關(guān)變換器、穩(wěn)壓器與控制器 8-20V 100uA 2.4% RoHS:否 制造商:Texas Instruments 輸出電壓:1.2 V to 10 V 輸出電流:300 mA 輸出功率: 輸入電壓:3 V to 17 V 開(kāi)關(guān)頻率:1 MHz 工作溫度范圍: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:WSON-8 封裝:Reel
S-8330A22FS-T2 功能描述:開(kāi)關(guān)變換器、穩(wěn)壓器與控制器 10-22V 100uA 2.4% RoHS:否 制造商:Texas Instruments 輸出電壓:1.2 V to 10 V 輸出電流:300 mA 輸出功率: 輸入電壓:3 V to 17 V 開(kāi)關(guān)頻率:1 MHz 工作溫度范圍: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:WSON-8 封裝:Reel
S-8330A22FS-T2-G 功能描述:開(kāi)關(guān)變換器、穩(wěn)壓器與控制器 10-22V 100uA 2.4% RoHS:否 制造商:Texas Instruments 輸出電壓:1.2 V to 10 V 輸出電流:300 mA 輸出功率: 輸入電壓:3 V to 17 V 開(kāi)關(guān)頻率:1 MHz 工作溫度范圍: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:WSON-8 封裝:Reel
S-8330A24FS-T2 功能描述:開(kāi)關(guān)變換器、穩(wěn)壓器與控制器 12-24V 100uA 2.4% RoHS:否 制造商:Texas Instruments 輸出電壓:1.2 V to 10 V 輸出電流:300 mA 輸出功率: 輸入電壓:3 V to 17 V 開(kāi)關(guān)頻率:1 MHz 工作溫度范圍: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:WSON-8 封裝:Reel
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