參數(shù)資料
型號(hào)： 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(yè)數(shù)： 8/43頁(yè)
文件大?。?/td> 588K
代理商： S-8333ABBB-T8T1G
STEP-UP, FOR LCD BIAS SUPPLY, 1-CHANNEL, PWM CONTROL SWITCHING REGULATOR CONTROLLER
S-8333 Series
Rev.2.3_00
Seiko Instruments Inc.
16
5. Oscillation frequency and maximum duty ratio setting resistors (ROSC, RDuty)
With the S-8333 Series, the oscillation frequency can be set in a range of 286 kHz to 1.133 MHz using external
resistance. Connect a resistor across the ROSC and VSS pins. Select the resistor by using the following
equation and referring to Figure 12. However, the following equation and figure assume that the resistance
value is the desired value and show the theoretical values when the IC is in the typical conditions. Note that
fluctuations of resistance and IC are not considered.
140
× 10
3
ROSC [k
]
fOSC [kHz]
1400
1200
1000
800
600
400
200
0
200
400
600
f OS
C
[kHz]
ROSC [k
]
Figure 12 ROSC vs. fOSC
With the S-8333 Series, the maximum duty ratio can be set in a range of 47% to 88.5% (between 47 to 80%, if the
oscillation frequency is less than 500 kHz) by an external resistor. Connect the resistor across the RDuty and
VSS pins. Select the resistance by using the following equation and referring to Figure 13. The maximum duty
ratio fluctuates according to the oscillation frequency. If the value of ROSC is changed, therefore, be sure to
change the value of RDuty so that it is always in proportion to RDuty / ROSC. However, the following equation
and figure assume that the resistance value is the desired value and show the theoretical values when the IC is
in the typical conditions. Note that fluctuations of resistance and IC are not considered.
Caution Set max. duty 80% or less if the oscillation frequency is less than 500 kHz.
(95.5
MaxDuty)
ROSC
RDuty
15.0
100
90
80
70
60
50
40
0
2
4
MaxD
uty
[%
]
RDuty / ROSC
1
3
Figure 13 RDuty / ROSC vs. MaxDuty
Connect resistors ROSC and RDuty as close to the IC as possible.
相關(guān)PDF資料
PDF描述
S-8333ACIC-T8T1G 0.16 A SWITCHING CONTROLLER, 1133 kHz SWITCHING FREQ-MAX, PDSO8
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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-8335A120FT-TB-G 功能描述:開(kāi)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(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-8335A160FT 功能描述:開(kāi)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(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-8335A160FT-TB-G 功能描述:開(kāi)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(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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