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參數(shù)資料
| 型號(hào)： | AAT2511_0605 |
| 廠商： | Advanced Analog Technology,lnc. |
| 英文描述： | Dual 600mA, 1MHz Step-Down DC/DC Converter |
| 中文描述： | 雙600mA的，1MHz的降壓型DC / DC轉(zhuǎn)換器 |
| 文件頁數(shù)： | 10/20頁 |
| 文件大?。?/td> | 603K |
| 代理商： | AAT2511_0605 |
AAT2511
Dual 600mA, 1MHz Step-Down DC/DC Converter
10
2511.2006.05.1.4
Applications Information
Inductor Selection
The step-down converter uses peak current mode
control with slope compensation to maintain stabil-
ity for duty cycles greater than 50%. The output
inductor value must be selected so the inductor
current down slope meets the internal slope com-
pensation requirements. The internal slope com-
pensation for the adjustable and low-voltage fixed
versions of the AAT2511 is 0.24A/μsec. This
equates to a slope compensation that is 75% of the
inductor current down slope for a 1.5V output and
4.7μH inductor.
This is the internal slope compensation for the
adjustable (0.6V) version or low-voltage fixed ver-
sion. When externally programming the 0.6V ver-
sion to a 2.5V output, the calculated inductance
would be 7.5μH.
In this case, a standard 10μH value is selected.
Manufacturer's specifications list both the inductor
DC current rating, which is a thermal limitation, and
the peak current rating, which is determined by the
saturation characteristics. The inductor should not
show any appreciable saturation under normal load
conditions. Some inductors may meet the peak and
average current ratings yet result in excessive loss-
es due to a high DCR. Always consider the losses
associated with the DCR and its effect on the total
converter efficiency when selecting an inductor.
The 4.7μH CDRH3D16 series inductor selected
from Sumida has a 105m
Ω
DCR and a 900mA DC
current rating. At full load, the inductor DC loss is
38mW for a 600mA 1.5V output.
Input Capacitor
Select a 4.7μF to 10μF X7R or X5R ceramic capac-
itor for the input. To estimate the required input
capacitor size, determine the acceptable input rip-
ple level (V
PP
) and solve for C. The calculated
value varies with input voltage and is a maximum
when V
IN
is double the output voltage.
This equation provides an estimate for the input
capacitor required for a single channel.
1
-
V
O
V
IN
V
PP
I
O
C
IN
=
V
O
V
IN
- ESR
F
S
0.75
V
L = = 0.75V
≈
3
V
O
m
0.24A
/
sec
= 3 A
2.5V = 7.5
μ
H
sec
A
μ
sec
0.75
V
L
m = = 0.75
1.5V
4.7
μ
H
A
μ
sec
Table 1: Inductor Values.
Configuration
Output Voltage
Inductor
Slope Compensation
0.6V Adjustable With
External Resistive Divider
0.6V to 2.0V
4.7μH
0.24A/μsec
2.5V
10μH
0.24A/μsec
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| AAT2511IWP | 制造商:ANALOGICTECH 制造商全稱:Advanced Analogic Technologies 功能描述:Dual 600mA, 1MHz Step-Down DC/DC Converter |
| AAT2511IWP-AA-T1 | 制造商:Skyworks Solutions Inc 功能描述:DC TO DC CONVERTER |
| AAT2512 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Dual 400mA High Frequency Buck Converter |
| AAT2512IWP-AA-T1 | 制造商:Skyworks Solutions Inc 功能描述:DC TO DC CONVERTER |
| AAT2512IWP-IH-T1 | 制造商:ANALOGICTECH 制造商全稱:Advanced Analogic Technologies 功能描述:Dual 400mA High Frequency Buck Converter |
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