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| 型號： | S-8333ABBB-T8T1G |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 0.16 A SWITCHING CONTROLLER, 1133 kHz SWITCHING FREQ-MAX, PDSO8 |
| 封裝： | LEAD FREE, TSSOP-8 |
| 文件頁數(shù)： | 6/43頁 |
| 文件大?。?/td> | 588K |
| 代理商： | S-8333ABBB-T8T1G |
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STEP-UP, FOR LCD BIAS SUPPLY, 1-CHANNEL, PWM CONTROL SWITCHING REGULATOR CONTROLLER
S-8333 Series
Rev.2.3_00
Seiko Instruments Inc.
14
External Parts Selection
1. Inductor
The inductance has a strong influence on the maximum output current (IOUT) and efficiency (
η).
The peak current (IPK) increases by decreasing L and the stability of the circuit improves and IOUT increases. If L
is decreased further, the efficiency falls, and IOUT decreases if the current drive capability of the external
transistor is insufficient.
The loss of IPK by the switching transistor decreases by increasing L and the efficiency becomes maximum at a
certain L value. Further increasing L decrease the efficiency due to the loss of the DC resistance of the inductor.
IOUT also decreases.
If the oscillation frequency is higher, a smaller L value can be chosen, making the inductor smaller. In the S-8333
Series, the oscillation frequency can be varied within the range of 286 kHz to 1.133 MHz by the external resistor,
so select an L value best suited to the frequency. The recommended value is between 2.2
H and 22 H.
When selecting an inductor, note the allowable current of the inductor. If a current exceeding this allowable
current flows through the inductor, magnetic saturation occurs, substantially lowering the efficiency and
increasing the current, which results in damage to the IC.
Therefore, select an inductor so that IPK does not exceed the allowable current. IPK is expressed by the following
equations in the discontinuous mode and continuous mode.
L
fosc
)
V
(V
I
2
I
IN
D
OUT
PK
+
=
)
mode
ous
discontinu
(
.................................................................. (17)
L
fosc
)
V
(V
2
V
)
V
(V
I
V
I
D
OUT
IN
D
OUT
IN
D
OUT
PK
+
+
=
mode)
s
(continuou
........................................................ (18)
fOSC
= Oscillation frequency, VD 0.4 V.
2. Diode
Use an external diode that meets the following requirements.
Low forward voltage
High switching speed
Reverse breakdown voltage: VOUT + [Spike voltage] or more
Rated current: IPK or more
3. Capacitors (CIN, CL)
The capacitor on the input side (CIN) can lower the supply impedance and level the input current for better
efficiency. Select CIN according to the impedance of the power supply to be used.
The capacitor on the output side (CL) is used to smooth the output voltage. Select an appropriate capacitance
value based on the I/O conditions and load conditions. A capacitance of 10
F or more is recommended.
By adjusting the phase compensation of the feedback loop using the external resistor (RZ) and capacitor (CZ), a
ceramic capacitor can be used as the capacitor on the output side. If a capacitor whose equivalent series
resistance is between 30 m
and 500 m is used as the output capacitor, the adjustable range of the phase
compensation is wider; however, note that other characteristics may be affected by ripple voltage or other
conditions at this time. The optimal capacitor differs depending on the L value, capacitance value, wiring, and
application (output load), so select the capacitor after performing sufficient evaluation under the actual usage
conditions.
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| S-8333CCBC-T8T1U | 功能描述:IC REG CTRLR BOOST 8TSSOP 制造商:ablic u.s.a. inc. 系列:- 包裝:剪切帶（CT） 零件狀態(tài):在售 輸出類型:晶體管驅(qū)動器 功能:升壓 輸出配置:正 拓撲:升壓 輸出數(shù):1 輸出階段:1 電壓 - 電源（Vcc/Vdd）:1.8 V ~ 6 V 頻率 - 開關(guān):280kHz ~ 1.08MHz 占空比（最大）:0.89 同步整流器:無 時鐘同步:無 串行接口:- 控制特性:限流，頻率控制 工作溫度:-40°C ~ 85°C（TA） 封裝/外殼:8-TSSOP（0.173"，4.40mm 寬） 供應商器件封裝:8-TSSOP 標準包裝:1 |
| S-8335A120FT | 功能描述:開關(guān)變換器、穩(wěn)壓器與控制器 Dual Pos/Neg 3 Ch 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 開關(guān)頻率:1 MHz 工作溫度范圍: 安裝風格:SMD/SMT 封裝 / 箱體:WSON-8 封裝:Reel |
| S-8335A120FT-TB-G | 功能描述:開關(guān)變換器、穩(wěn)壓器與控制器 Dual Pos/Neg 3 Ch 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 開關(guān)頻率:1 MHz 工作溫度范圍: 安裝風格:SMD/SMT 封裝 / 箱體:WSON-8 封裝:Reel |
| S-8335A160FT | 功能描述:開關(guān)變換器、穩(wěn)壓器與控制器 Dual Pos/Neg 3 Ch 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 開關(guān)頻率:1 MHz 工作溫度范圍: 安裝風格:SMD/SMT 封裝 / 箱體:WSON-8 封裝:Reel |
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