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參數(shù)資料
| 型號： | AT1361X_GRE |
| 廠商： | Aimtron Technology Corp. |
| 英文描述： | 1MHz,1A Synchronous Buck Converter |
| 中文描述： | 1MHz的，第1A同步降壓轉(zhuǎn)換器 |
| 文件頁數(shù)： | 10/15頁 |
| 文件大小： | 210K |
| 代理商： | AT1361X_GRE |
AT1361
1MHz,1A Synchronous Buck Converter
Application Information
Short Circuit Protection Function
The AT1361 has short circuit protection(see the Electrical Characteristics frequency item).
When the output is shorted to ground, the frequency of the oscillator is reduced to about
200KHz. This frequency foldback ensures that the inductor current has more time to decay.
It will prevent the inductor current and internal P-MOSFET current runaway to damage the
device. The frequency will return to the normal values when the short circuit condition is
removed and the feedback voltage reaches 0.6V.
Capacitor Selection
In continuous mode, the source current of the top MOSFET is square wave of duty cycle.
The Primary function of the input capacitor is to provide a low impedance loop for the
edges of pulsed current drawn by the AT1361. A load step at the output can induce ringing
at the input VIN. This ringing can couple to the output and be mistaken as loop instability.
The oscillation can be improved by add the capacitance of the input capacitor. A typical
value is 4.7~22
μ
F ceramic (X5R or X7R), POSCAP or Aluminum Polymer. These
capacitors will provide good high frequency bypassing and their low ESR will reduce
resistive losses for higher efficiency. The input capacitor RMS current varies with the input
voltage and the output voltage. The equation for the maximum RMS current in the input
capacitor is:
The output capacitor depends on the suitable ripple voltage. Low ripple voltage
corresponds to lower effective series resistance (ESR). The output ripple voltage is
determined by:
The output capacitor RMS ripple current is given by:
f
L
×
×
3
2
7F, No.9, PARK AVENUE II, Science-Based Industrial Park, Hsinchu 300,Taiwan, R.O.C.
Tel: 886-3-563-0878 Fax: 886-3-563-0879 WWW:
http://www.aimtron.com.tw
1/11/2008 REV:1.0 Email:
service@aimtron.com.tw
10
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IN
O
IN
O
OMAX
RMS
V
V
V
V
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8
1
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OUT
L
OUT
fC
ESR
I
V
+
IN
OUT
IN
OUT
RMS
V
V
V
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V
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1
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| AT1362 | Synchronous Buck Converter With Power Good Detector & LDO |
| AT1362A | Synchronous Buck Converter With Power Good Detector & LDO |
| AT1362AN | Synchronous Buck Converter With Power Good Detector & LDO |
| AT1362B | Synchronous Buck Converter With Power Good Detector & LDO |
| AT1362BN | Synchronous Buck Converter With Power Good Detector & LDO |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| AT1362 | 制造商:AIMTRON 制造商全稱:AIMTRON 功能描述:Synchronous Buck Converter With Power Good Detector & LDO |
| AT1362A | 制造商:AIMTRON 制造商全稱:AIMTRON 功能描述:Synchronous Buck Converter With Power Good Detector & LDO |
| AT1362AN | 制造商:AIMTRON 制造商全稱:AIMTRON 功能描述:Synchronous Buck Converter With Power Good Detector & LDO |
| AT1362B | 制造商:AIMTRON 制造商全稱:AIMTRON 功能描述:Synchronous Buck Converter With Power Good Detector & LDO |
| AT1362BN | 制造商:AIMTRON 制造商全稱:AIMTRON 功能描述:Synchronous Buck Converter With Power Good Detector & LDO |
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