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參數(shù)資料
| 型號(hào)： | S-8323 |
| 廠商： | Seiko Instruments Inc. |
| 英文描述： | CMOS PWM-Control Step-Up Switching Regulator(Built-In Switch)(CMOS PFM（頻率脈沖調(diào)制）控制步升開(kāi)關(guān)穩(wěn)壓器) |
| 中文描述： | 的CMOS脈寬調(diào)制控制升壓開(kāi)關(guān)穩(wěn)壓器（內(nèi)置開(kāi)關(guān)）（烤瓷的CMOS（頻率脈沖調(diào)制）控制步升開(kāi)關(guān)穩(wěn)壓器） |
| 文件頁(yè)數(shù)： | 17/65頁(yè) |
| 文件大?。?/td> | 569K |
| 代理商： | S-8323 |
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SMALL PACKAGE PWM CONTROL STEP-UP SWITCHING REGULATOR
S-8323/8327 Series
16
Seiko Instruments Inc.
4.2. Enhancement MOS FET type
5. Others (S-8323D and S-8327E only)
The S-8323D and S-8327E are applicable to the following uses because the power pin for IC chip and Vout pin for output
voltage are separated:
When changing the output voltage with an external resistance.
When outputing the high voltage such as +12 V or +15 V.
When making the step-down DC/DC converter
When making the voltage inverting type DC/DC converter.
Choose the products in the following table according to applications for
@
to
B
.
Use
Step-up
5V
≤
V
CC
<9V
—
—
Step-down
3V
≤
V
CC
<5V
—
Output voltage V
CC
S-8323D20
S-8323D30
S-8323D50
S-8327E20
S-8327E50
Connection to V
DD
pin
2V
≤
V
CC
<3V
3V
≤
V
CC
<5V
—
9V
≤
V
CC
—
—
—
—
Ref. circuit
Std. circuit (5)
Std. circuit (5)
Std. circuit (5)
Std. circuit (6)
Std. circuit (6)
—
2V
≤
V
CC
<3V
5V
≤
V
CC
<9V
—
—
Ref. circuit
Appl. circuit 3
Appl. circuit 3
Appl. circuit 3
—
—
—
—
—
—
—
—
—
V
IN
—
—
—
—
V
IN
—
—
—
V
IN
—
—
V
IN
or V
CC
V
IN
or V
CC
V
IN
or V
CC
V
IN
The operational precautions are follows:
I.
This IC starts to oscillate and step up operation at Vdd = 0.9 V, but frequency of the oscillator does’t stabilize.
Input the voltage from 2 V to 9 V for V
DD
pin to get the stabilized output voltage and oscilation frequency.
The input voltage from 2 V to 9 V for V
DD
pin allows the connection of V
DD
pin to both input power pin V
IN
and output
power pin Vout.
II.
Choose external resistors R
A
and R
B
not to affect to the output voltage with the consideration of the impedance between
V
OUT
and V
SS
pins in the IC chip.
Internal resistance between V
OUT
and V
SS
pins are as follows:
S-8323D20 and S-8327E20: 3.0 M
to 19.6 M
S-8323D30: 3.3 M
to 22.6 M
S-8323D50 and S-8327E50: 2.1 M
to 19.1 M
III.
Attach the capacitor “C
C
” in parallel to R
A
resistance when the oscilation of the output voltage occurs.
Caluculate “C
C
” from the following formula:
V
OUT
Figure 9 Circuit example using 2SK1959
Figure 9 is a circuit example using NEC 2SK1959 MOS FET
transistor (N-channel).
For a MOS FET, an N-channel power MOS FET should be used.
In particular the EXT pin of the S-8327 can drive a MOS FET with
a gate capacity of around 1000 pF. Because the gate voltage and
current of the external power MOS FET are supplied from the
stepped out output voltage V
OUT
, the MOS FET is driven more
effectively.
Since the ON resistor of the MOS FET might affect the output
amperage as well as the efficiency, the threshold voltage should
be low. When the output voltage is as low as 2.0V the same as
in the S-8327E20, the circuit operates only when the MOS FET
has the threshold voltage lower than 2.0V.
EXT
V
OUT
-
+
(ON/OFF)
V
S
+
-
C
C
(F)=
2
π
R
A
20 kHz
1
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| S-8327 | CMOS PWM-Control Step-Up Switching Regulator(External Transistor)(CMOS PFM（頻率脈沖調(diào)制）控制步升開(kāi)關(guān)穩(wěn)壓器) |
| S-8324 | CMOS PWM/PFM-Control Step-Up Switching Regulator(CMOS PWM/PFM控制步升開(kāi)關(guān)穩(wěn)壓器) |
| S-8328 | CMOS PWM/PFM-Control Step-Up Switching Regulator(CMOS PWM/PFM控制步升開(kāi)關(guān)穩(wěn)壓器) |
| S-8330 | 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-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) |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| S-8323A27MC-ELH-T2 | 功能描述:開(kāi)關(guān)變換器、穩(wěn)壓器與控制器 REORD 628-8353A27MC 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-8323A30MC-ELK-T2 | 功能描述:DC/DC 開(kāi)關(guān)控制器 3.0V 17.2uA 2.4% RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開(kāi)關(guān)頻率: 輸出電壓:1.215 V to 80 V 輸出電流:3.5 A 輸出端數(shù)量:1 最大工作溫度:+ 125 C 安裝風(fēng)格: 封裝 / 箱體:CPAK |
| S-8323A33MC-ELN-T2 | 功能描述:DC/DC 開(kāi)關(guān)控制器 3.3V 19.1uA 2.4% RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開(kāi)關(guān)頻率: 輸出電壓:1.215 V to 80 V 輸出電流:3.5 A 輸出端數(shù)量:1 最大工作溫度:+ 125 C 安裝風(fēng)格: 封裝 / 箱體:CPAK |
| S-8323A50MC-EME-T2 | 功能描述:開(kāi)關(guān)變換器、穩(wěn)壓器與控制器 REORD 628-8353A50MC 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 |
| S8324A10-8 | 制造商: 功能描述: 制造商:undefined 功能描述: |
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