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參數(shù)資料
| 型號： | AAT1110 |
| 廠商： | Advanced Analog Technology,lnc. |
| 英文描述： | Fast Transient 800mA Step-Down Converter |
| 中文描述： | 快速瞬態(tài)800mA的降壓轉(zhuǎn)換器 |
| 文件頁數(shù)： | 11/19頁 |
| 文件大?。?/td> | 710K |
| 代理商： | AAT1110 |
AAT1110
Fast Transient 800mA Step-Down Converter
1110.2006.04.1.0
11
Applications Information
Inductor Selection
The step-down converter uses peak current mode
control with slope compensation to maintain stability
for duty cycles greater than 50%. The output induc-
tor value must be selected so the inductor current
down slope meets the internal slope compensation
requirements. The internal slope compensation for
the adjustable and low-voltage fixed versions of the
AAT1110 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-
sions. When externally programming the 0.6V ver-
sion to 2.5V, the calculated inductance is 7.5μH.
In this case, a standard 6.8μH value is selected.
For high-voltage fixed versions (
≥
2.5V), m = 0.48A/
μsec. Table 1 displays inductor values for the
AAT1110 fixed and adjustable options.
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
maximum DCR and a
900mA DC current rating. At full load, the inductor
DC loss is 67mW which gives a 4.0% loss in effi-
ciency for a 800mA, 2.5V output.
Input Capacitor
Select a 4.7μF to 22μF 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.
Always examine the ceramic capacitor DC voltage
coefficient characteristics when selecting the prop-
er value. For example, the capacitance of a 10μF,
6.3V, X5R ceramic capacitor with 5.0V DC applied
is actually about 6μF.
C
IN(MIN)
=
1
- ESR
·
4
·
F
S
I
O
V
PP
· 1
-
= 1
IN
= 2
×
V
O
V
IN
V
IN
O
V
O
4
· 1
-
V
O
V
IN
C
IN
=
V
O
V
IN
- ESR
·
F
S
V
PP
I
O
0.75
V
L = = 0.75
≈
3
V
O
m
0.24A
= 3 A
2.5V = 7.5
μ
H
V
O
sec
A
μ
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
0.6V Adjustable With
External Feedback
1V, 1.2V
2.2μH
1.5V, 1.8V
4.7μH
2.5V, 3.3V
6.8μH
Fixed Output
0.6V to 3.3V
4.7μH
相關(guān)PDF資料 |
PDF描述 |
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| AAT1110_06 | Fast Transient 800mA Step-Down Converter |
| AAT1110IJS-0.6-T1 | Fast Transient 800mA Step-Down Converter |
| AAT1120 | 500mA Step-Down Converter |
| AAT1120IES-0.6-T1 | 500mA Step-Down Converter |
| AAT1121 | 1.5MHz, 250mA Step-Down Converter |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| AAT1110_06 | 制造商:ANALOGICTECH 制造商全稱:Advanced Analogic Technologies 功能描述:Fast Transient 800mA Step-Down Converter |
| AAT1110IJS-0.6-T1 | 制造商:Skyworks Solutions Inc 功能描述:DC TO DC CONVERTER |
| AAT1110IJS-3.3-T1 | 功能描述:直流/直流開關(guān)轉(zhuǎn)換器 2.7-5.5Vin 800mA 1.4MHz Step-Down RoHS:否 制造商:Monolithic Power Systems (MPS) 最大輸入電壓: 開關(guān)頻率: 輸出電壓: 輸出電流: 輸出端數(shù)量: 最大工作溫度: 安裝風(fēng)格: |
| AAT1110-S | 制造商:AAT 制造商全稱:AAT 功能描述:ONE-CHANNEL STEP-DOWN PWM CONTROLLER |
| AAT1110-S-T | 制造商:AAT 制造商全稱:AAT 功能描述:ONE-CHANNEL STEP-DOWN PWM CONTROLLER |
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