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參數(shù)資料
| 型號： | S-8460B00AFT-TB |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 0.1 A SWITCHING CONTROLLER, 345 kHz SWITCHING FREQ-MAX, PDSO16 |
| 封裝： | TSSOP-16 |
| 文件頁數(shù)： | 7/33頁 |
| 文件大小： | 617K |
| 代理商： | S-8460B00AFT-TB |
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STEP-UP OR DOWN, SINGLE-COIL, PWM CONTROL SWITCHING REGULATOR CONTROLLER
Rev.1.2_00
S-8460
Seiko Instruments Inc.
15
Precautions
Mount the external capacitors, diode, coil, and other peripheral parts as close to the IC as possible, and make a one-
point grounding.
Normally SW1 and SW2 do not turn on at the same time. If external N-channel transistors have much different
characteristics (input capacitance, Vth, etc.) among them, however, they may turn on at the same time, and through
current flows. Select transistors with similar characteristics.
Characteristics ripple voltage and spike noise occur in IC containing switching regulators. Moreover rush current flows
at the time of a power supply injection. Because these largely depend on the coil, the capacitor and impedance of
power supply used, fully check them using an actually mounted model.
When the input voltage is high and the output current is low, pulses with a low duty ratio may appear, and then the 0%
duty ratio continues for several clocks. In this case the operation changes to the pseudo pulse frequency modulation
(PFM) mode, but the ripple voltage hardly increases.
According to the input voltage and the load condition the oscillation frequency of the EXT1 to EXT3 may become an
integer fraction of 300 kHz.
No parts other than a capacitor (CVL) and a Schottky diode (SD2) can be connected to the VL pin.
A 4.7 F ceramic capacitor should be connected to the VL pin.
The overload protection circuit of the IC starts working by detecting the time for maximum duty. In choosing the
parts, make sure that the overcurrent caused by load short-circuiting will not exceed the power dissipation of the
switching transistors, diodes, and the inductor.
The oscillation frequency of the EXT1 and EXT2 may vary in some voltage range and load condition depending on
input voltage.
If the VOUT pin is short-circuited to VSS, the protection circuit starts to operate before the integral protection time tPRO
passes.
When the temperature is high and the load is 0 to 1 A, the voltage of the EXT1 to EXT3 pins is held “L” and the
output voltage VOUT increases.
The operation returns to normal when the load of 1
A or more is attached.
Make sure that dissipation of the switching transistor especially at high temperature will not surpass the power
dissipation of the package.
Switching regulator performance varies depending on the design of PCB patterns, peripheral circuits and parts.
Thoroughly evaluate the actual device when setting. When using parts other than those which are recommended,
contact the SII marketing department.
Do not apply an electrostatic discharge to this IC that exceeds the performance ratings of the built-in electrostatic
protection circuit.
SII claims no responsibility for any disputes arising out of or in connection with any infringement by products including
this IC of patents owned by a third party.
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| S-8460B00AFT-TBG | 功能描述:開關(guān)變換器、穩(wěn)壓器與控制器 2.5-6.0V Step-Up/Dwn 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 |
| S846E2000M2 | 制造商:STEC Inc 功能描述:S800 SAS SSD 2.5" 15MM 2TB MLC COMMERCIAL (0C TO +60C) - Bulk |
| S846E200M1 | 制造商:STEC Inc 功能描述:S800 SAS SSD 1.8" 5MM 200GB MLC COMMERCIAL (0C TO +60C) - Bulk |
| S-8470 | 制造商:SII 制造商全稱:Seiko Instruments Inc 功能描述:CMOS POWER MANAGEMENT IC |
| S-8470AFS | 制造商:SII 制造商全稱:Seiko Instruments Inc 功能描述:CMOS POWER MANAGEMENT IC |
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