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參數(shù)資料
| 型號(hào)： | AAT1156_07 |
| 廠商： | Advanced Analog Technology,lnc. |
| 元件分類(lèi)： | DC/DC變換器 |
| 英文描述： | 1MHz 700mA Step-Down DC-DC Converter |
| 中文描述： | 1MHz的700mA的降壓型DC - DC轉(zhuǎn)換器 |
| 文件頁(yè)數(shù)： | 11/15頁(yè) |
| 文件大?。?/td> | 586K |
| 代理商： | AAT1156_07 |
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Thermal Calculations
There are three types of losses associated with the AAT1156: MOSFET switching losses, conduction losses,
and quiescent current losses. The conduction losses are due to the R
DS(ON)
characteristics of the internal P-
and N-channel MOSFET power devices. At full load, assuming continuous conduction mode (CCM), a simpli-
fied form of the total losses is given by:
where I
Q
is the AAT1156 quiescent current.
Once the total losses have been determined, the junction temperature can be derived from the
θ
JA
for the
QFN33-16 package.
Adjustable Output
Resistors R3 and R4 of Figure 1 force the output to regulate higher than 0.6V. The optimum value for R4 is
59k
Ω
. Values higher than this may cause problems with stability, while lower values can degrade light load
efficiency. For a 2.5V output with R4 set to 59k
Ω
, R3 is 187k
Ω
.
Figure 4: R3 vs. V
OUT
for Adjustable Output Using the AAT1156.
Output Voltage (V)
R
Ω
)
0
50
100
150
200
250
300
350
400
450
500
1
1.5
2
2.5
3.5
3
4
4.5
5
5.5
R4=59k
Ω
R3 = V
·
R4 = 0.6V
·
59k
Ω
= 187k
Ω
REF
V
O
2.5V
T
J
=
P ·
Θ
JA
+ T
AMB
I
2
(
R
V
+ R
(
V
- V
))
P = + (t
sw
F
S
I
O
V
IN
+ I
Q
)
V
IN
V
IN
AAT1156
1MHz 700mA Step-Down DC-DC Converter
1156.2007.01.1.4
11
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| AAT1156IVN-T1 | 制造商:ANALOGICTECH 制造商全稱(chēng):Advanced Analogic Technologies 功能描述:1MHz 700mA Step-Down DC-DC Converter |
| AAT1157 | 制造商:ANALOGICTECH 制造商全稱(chēng):Advanced Analogic Technologies 功能描述:1MHz 1.2A Buck DC/DC Converter |
| AAT1157IVN-T1 | 制造商:Skyworks Solutions Inc 功能描述:DC TO DC CONVERTER |
| AAT1160 | 制造商:AAT 制造商全稱(chēng):AAT 功能描述:Step Up Current Mode PWM Converter with 4+1 Operational Amplifiers |
| AAT1160IRN-0.6-T1 | 制造商:Skyworks Solutions Inc 功能描述:DC TO DC CONVERTER |
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