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參數(shù)資料
| 型號： | AAT1155_06 |
| 廠商： | Advanced Analog Technology,lnc. |
| 英文描述： | 1MHz 2.5A Step-Down DC/DC Converter |
| 中文描述： | 1MHz的2.5A降壓型DC / DC轉(zhuǎn)換器 |
| 文件頁數(shù)： | 10/17頁 |
| 文件大?。?/td> | 532K |
| 代理商： | AAT1155_06 |
AAT1155
1MHz 2.5A Step-Down DC/DC Converter
10
1155.2006.09.1.7
Current Limit and Over-Temperature
Protection
Over-temperature and current limit circuitry pro-
tects the AAT1155 and the external Schottky diode
during overload, short-circuit, and excessive ambi-
ent temperature conditions. The junction over-tem-
perature threshold is 140°C nominal and has 15°C
of hysteresis. Typical graphs of the over-tempera-
ture load current vs. input voltage and ambient
temperature are shown in the Typical Character-
istics section of this document.
Inductor
The output inductor is selected to limit the ripple cur-
rent to 20% to 40% of the full load current at the max-
imum input voltage. Manufacturer's specifications list
both the inductor DC current rating, which is a ther-
mal limitation, and the peak current rating, which is
determined by the inductor saturation characteristics.
The inductor should not show any appreciable satu-
ration under normal load conditions. During overload
and short-circuit conditions, the inductor can exceed
its peak current rating without affecting the converter
performance. Some inductors may have sufficient
peak and average current ratings yet result in exces-
sive losses due to a high DCR. The losses associat-
ed with the DCR and its effect on the total converter
efficiency must be considered.
For a 2.5A load and the ripple current set to 40% at
the maximum input voltage, the maximum peak-to-
peak ripple current is 1A. Assuming a 5V ±5% input
voltage and 40% ripple, the output inductance
required is:
The factor "k" is the fraction of the full load (40%)
selected for the ripple current at the maximum input
voltage.
The corresponding inductor RMS current is:
Δ
I is the peak-to-peak ripple current which is fixed
by the inductor selection above. For a peak-to-
peak current of 40% of the full load current, the
peak current at full load will be 120% of the full
load. The 1.5μH inductor selected from the Sumida
CDRH6D38 series has a 11m
Ω
DCR and a 4.0A
DC current rating with a height of 4mm. At full load,
the inductor DC loss is 70mW for a 0.84% loss in
efficiency.
2
2
2.5A
12
RMS
O
O
I
I
I
I
≈
Δ
=
+
=
L = I
OUT
· k · F
S
V
IN(MAX)
V
OUT
V
OUT
= 3.3V
2.5A · 0.4 · 1MHz
5.25V
3.3V
= 1.23
μ
H
Figure 1: AAT1155 Evaluation Board with Adjustable Output.
D1
B340LA
L1
1.5μH
C2
120μF
C1
10μF
VP
VCC
EN
GND
FB
LX
LX
VP
U1
AAT1155-1.0
R1
100
C3
0.1μF
C3 0.1μF 0603ZD104M AVX
C4 Vishay Sprague 100μF 16V 595D107X0016C 100μF 16V
L1 CDRH6D28-1.5μH Sumida
D1 B340LA Diodes Inc.
R2
100k
C1 Murata 10μF 6.3V X5R GRM42-6X5R106K6.3
C2 Vishay 120μF 6.3V 594D127X96R6R3C2T
C2 MuRata 100uF 6.3V GRM43-2 X5R 107M 100μF 6.3V (two or three in parallel)
C2 TDK 100μF 6.3V C3325X5R0J107M 100μF 6.3V (two or three in parallel)
Vin 2.7V-5.5V
V
OUT
1.25V @ 2.5A
rtn
C4
100μF
R3
2.55k
R4
10.0k
Options
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| AAT1155IKS-1.0-T1 | 1MHz 2.5A Step-Down DC/DC Converter |
| AAT1155IKS-1.8-T1 | 1MHz 2.5A Step-Down DC/DC Converter |
| AAT1155IKS-2.5-T1 | 1MHz 2.5A Step-Down DC/DC Converter |
| AAT1155IKS-3.3-T1 | 1MHz 2.5A Step-Down DC/DC Converter |
| AAT1156 | 1MHz 700mA Step-Down DC-DC Converter |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| AAT1155IKS-1.0-T1 | 制造商:SKYWORKS SOLUTIONS 功能描述:AAT1155 Series 5.5 V 1 MHz 2.5 A SMT Step-Down DC/DC Converter - MSOP-8 制造商:Skyworks Solutions Inc 功能描述:DC TO DC CONVERTER |
| AAT1155IKS-1.8-T1 | 制造商:ANALOGICTECH 制造商全稱:Advanced Analogic Technologies 功能描述:1MHz 2.5A Step-Down DC/DC Converter |
| AAT1155IKS-2.5-T1 | 制造商:ANALOGICTECH 制造商全稱:Advanced Analogic Technologies 功能描述:1MHz 2.5A Step-Down DC/DC Converter |
| AAT1155IKS-3.3-T1 | 制造商:SKYWORKS SOLUTIONS 功能描述:AAT1155 Series 5.5 V 1 MHz 2.5 A SMT Step-Down DC/DC Converter - MSOP-8 |
| AAT1156 | 制造商:ANALOGICTECH 制造商全稱:Advanced Analogic Technologies 功能描述:1MHz 700mA Step-Down DC-DC Converter |
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