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參數(shù)資料
| 型號： | NCV8843 |
| 廠商： | ON SEMICONDUCTOR |
| 英文描述： | 1.5 A, 340 kHz, Buck Regulator with Synchronization Capability(具有同步能力的1.5A, 340kHz, 降壓穩(wěn)壓器) |
| 中文描述： | 1.5甲，340千赫，巴克與同步功能（具有同步能力的1.5A的，340kHz，降壓穩(wěn)壓器穩(wěn)壓器） |
| 文件頁數(shù)： | 11/15頁 |
| 文件大?。?/td> | 186K |
| 代理商： | NCV8843 |
NCV8843
http://onsemi.com
11
Figure 12. The Output Voltage Ripple Using Two 10 F
Ceramic Capacitors in Parallel
Figure 13. The Output Voltage Ripple Using One
100 F POSCAP Capacitor
Figure 14. The Output Voltage Ripple Using
One 100 F OSCON
Figure 15. The Output Voltage Ripple Using
One 100 F Tantalum Capacitor
Figure 12 to Figure 15 show the output ripple of a 5.0 V
to 3.3 V/500 mA regulator using 22 H inductor and various
capacitor types. At the switching frequency, the low ESR
and ESL make the ceramic capacitors behave capacitively
as shown in Figure 12. Additional paralleled ceramic
capacitors will further reduce the ripple voltage, but
inevitably increase the cost. “POSCAP”, manufactured by
SANYO, is a solid electrolytic capacitor. The anode is
sintered tantalum and the cathode is a highly conductive
polymerized organic semiconductor. TPC series, featuring
low ESR and low profile, is used in the measurement of
Figure 13. It is shown that POSCAP presents a good balance
of capacitance and ESR, compared with a ceramic capacitor.
In this application, the low ESR generates less than 5.0 mV
of ripple and the ESL is almost unnoticeable. The ESL of the
throughhole OSCON capacitor give rise to the inductive
impedance. It is evident from Figure 14 which shows the
step rise of the output ripple on the switch turnon and large
spike on the switch turnoff. The ESL prevents the output
capacitor from quickly charging up the parasitic capacitor of
the inductor when the switch node is pulled below ground
through the catch diode conduction. This results in the spike
associated with the falling edge of the switch node. The D
package tantalum capacitor used in Figure 15 has the same
footprint as the POSCAP, but doubles the height. The ESR
of the tantalum capacitor is apparently higher than the
POSCAP. The electrolytic and tantalum capacitors provide
a lowcost solution with compromised performance. The
reliability of the tantalum capacitor is not a serious concern
for output filtering because the output capacitor is usually
free of surge current and voltage.
Diode Selection
The diode in the buck converter provides the inductor
current path when the power switch turns off. The peak
reverse voltage is equal to the maximum input voltage. The
peak conducting current is clamped by the current limit of
the IC. The average current can be calculated from:
ID(AVG)
IO(VIN
VO)
VIN
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| NCV8843_10 | 制造商:ONSEMI 制造商全稱:ON Semiconductor 功能描述:1.5 A, 340 kHz, Buck Regulator with Synchronization Capability |
| NCV8843DG | 功能描述:直流/直流開關(guān)轉(zhuǎn)換器 340 KHZ REGULATOR RoHS:否 制造商:STMicroelectronics 最大輸入電壓:4.5 V 開關(guān)頻率:1.5 MHz 輸出電壓:4.6 V 輸出電流:250 mA 輸出端數(shù)量:2 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT |
| NCV8843DR2G | 功能描述:直流/直流開關(guān)轉(zhuǎn)換器 340 KHZ REGULATOR RoHS:否 制造商:STMicroelectronics 最大輸入電壓:4.5 V 開關(guān)頻率:1.5 MHz 輸出電壓:4.6 V 輸出電流:250 mA 輸出端數(shù)量:2 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT |
| NCV8843MNR2G | 功能描述:直流/直流開關(guān)轉(zhuǎn)換器 18L DFN 5X6 RoHS:否 制造商:STMicroelectronics 最大輸入電壓:4.5 V 開關(guān)頻率:1.5 MHz 輸出電壓:4.6 V 輸出電流:250 mA 輸出端數(shù)量:2 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT |
| NCV8843MNR2GEVB | 功能描述:電源管理IC開發(fā)工具 NCV8843 EVAL BRD RoHS:否 制造商:Maxim Integrated 產(chǎn)品:Evaluation Kits 類型:Battery Management 工具用于評估:MAX17710GB 輸入電壓: 輸出電壓:1.8 V |
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