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參數(shù)資料
| 型號： | S-8333ACIC-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)： | 43/43頁 |
| 文件大?。?/td> | 588K |
| 代理商： | S-8333ACIC-T8T1G |
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STEP-UP, FOR LCD BIAS SUPPLY, 1-CHANNEL, PWM CONTROL SWITCHING REGULATOR CONTROLLER
Rev.2.3_00
S-8333 Series
Seiko Instruments Inc.
9
Operation
1. Switching control method
1. 1 PWM control
The S-8333 Series is a DC-DC converter using a pulse width modulation method (PWM).
The pulse width of the S-8333 Series varies from 0% to the maximum duty set by RDuty depending on the load
current, but its switching frequency does not change. Consequently, the ripple voltage generated from switching
can be removed easily via a filter.
2. Soft-start function
For this IC, the built-in soft-start circuit controls the rush current and overshoot of the output voltage when
powering on. Reference voltage adjustment and maximum duty control methods are adopted as the soft-start
methods. The following describes the soft-start function at power application.
In the circuit where the input voltage is not directly output at shutdown by inserting a switch (SW) between the
diode (SD) and VOUT output, the VOUT voltage when the VIN voltage is applied with the SW OFF stays 0 V.
Therefore, the voltage of the FB pin stays 0 V and the EXT output is in the step up status between the “H” and “L”
levels due to the maximum duty. The maximum duty at this time is approximately 7% and the rush current at
power application is controlled. The maximum duty soft start is accomplished by gradually increasing the duty
width up to the maximum duty set by the external resistor RDuty (refer to Figure 8).
The reference voltage of the error amplifier input also gradually increases from 0 V at the same time as the
maximum duty soft start. The increasing of the output voltage is controlled by turning the SW ON. The soft-start
function is realized by controlling the voltage of the FB pin so that it is the same potential as the reference voltage
that is slowly raised. A Rail-to-Rail amplifier is adopted as the error amplifier, which means that the voltage is
loop controlled so that it can be the same as the reference voltage.
Once the reference voltage rises, the voltage cannot be reset (the reference voltage is 0 V) unless making the
power supply voltage lower than the UVLO detection voltage. Conversely, when the power supply voltage rises
up to the reset voltage after it is lowered to the UVLO detection voltage or lower, the output voltage is stepped up
by the soft-start function.
PWM
Comparator
VOUT
RFB2
RFB1
FB
SD
L
VIN
EXT
CC
RZ
CZ
M1
+
CL
Error amplifier
Vref
0.5 V
0 V
+
Error amplifier
reference voltage
SW
Figure 7
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
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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?fù)?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(yīng)商器件封裝:8-TSSOP 標(biāo)準(zhǔn)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(fēng)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(fēng)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(fēng)格:SMD/SMT 封裝 / 箱體:WSON-8 封裝:Reel |
| S-8335A160FT-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(fēng)格:SMD/SMT 封裝 / 箱體:WSON-8 封裝:Reel |
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