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參數(shù)資料
| 型號(hào)： | 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)： | 33/33頁 |
| 文件大?。?/td> | 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.
9
1. 4 Control Sequence
SW2
SW1
COUT
VOUT
SD1
VIN
SW3
Parasitic diode
Figure 9
If the switches, SW1 and SW2, are turned on simultaneously, VIN and VSS are short-circuited and large useless
current flows. And if the switches, SW2 and SW3, are turned on simultaneously, the energy stored in the coil
flows to VSS and is wasted. The S-8460 thus controls the switches in such a way that in operations involving SW1
and SW2, and involving SW2 and SW3 both switches are turned off simultaneously to avoid useless current flowing
due to simultaneous turn-on of the switches.
1. 5 Step-up and Step-down Selection Control
The S-8460 automatically selects operation between step-up and step-down to maintain a constant output voltage
according to the relationship between the input voltage (VIN), output voltage (VOUT), and output current (IOUT).
Simple relationships that step-up operation work when input voltage
≤ output voltage and that step-down operation
work when input voltage
≥ output voltage do not hold. Step-up operation emerges when the output voltage is kept
constant by step-up operation, and step-down operation emerges when the output voltage is kept constant by step-
down operation according to the relationship between VIN, VOUT, and IOUT.
Figure 10
shows the turning point between step-up operation and step-down schematically for the case when the
output voltage is 3.3 V. In the area where the two slant lines are crossing and noted by “Step-up or down” the S-
8460 shows step-up operation or step-down operation. Not that step-up operation and step-down operation
appear alternately in this area, but that one of the two operations is selected and stable operation is carried out.
The voltage for the turning point between step-up and step-down varies slightly due to external parts and mounting
conditions.
Step-down operation
18
3.3
2.2
0.1
1.0
10.0
100.0
1000.0
IOUT (mA)
V
IN
(V)
Output voltage
Step-up or
down
Step-up operation
VOUT
= 3.3 V
Figure 10 Graphic Scheme for Automatic Selection of Step-up and Step-down
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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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