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參數(shù)資料
| 型號(hào)： | LT3579IUFD-1#PBF |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | SWITCHING REGULATOR, PQCC20 |
| 封裝： | 4 X 5 MM, LEAD FREE, PLASTIC, MO-220, QFN-20 |
| 文件頁數(shù)： | 11/40頁 |
| 文件大?。?/td> | 503K |
| 代理商： | LT3579IUFD-1#PBF |
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LT3579/LT3579-1
19
35791f
Table 4. Boost Power Calculations Example with VIN = 5V, VOUT = 12V, IOUT = 1.5A, fOSC = 1MHz, VD = 0.5V, VCESAT = 0.185V
DEFINITION OF VARIABLES
EQUATIONS
DESIGN EXAMPLE
VALUE
DC = Switch Duty Cycle
DC
=
VOUT – VIN + VD
VOUT + VD – VCESAT
DC
=
12V – 5V
+ 0.5V
12V
+ 0.5V – .185V
DC = 60.9%
IIN = Average Input Current
η= Power Conversion Efficiency
(typically 90% at high currents)
IIN =
VOUT IOUT
VIN η
IIN =
12V
1.5A
5V
0.9
IIN = 4A
PSW = Switch I2R Loss
RSW = Switch Resistance (typically
45mΩ combined SW1 and SW2)
PSW = DC IIN 2 RSW
PSW = 0.609 (4A)2 45m
PSW = 438mW
PBAC = Base Drive Loss (AC)
PBAC = 13ns IIN VOUT fOSC
PBAC = 13ns 4A 12V 1MHz
PBAC = 624mW
PBDC = Base Drive Loss (DC)
PBDC =
VIN IIN DC
40
PBDC =
5V
4A 0.609
40
PBDC = 305mW
PINP = Input Power Loss
PINP = 14mA VIN
PINP = 14mA 5V
PINP = 70mW
PTOTAL = 1.437W
applicaTions inForMaTion
The following example calculates the power dissipation
in the LT3579 for a particular boost application:
(VIN = 5V, VOUT = 12V, IOUT = 1.5A, fOSC = 1MHz,
VD = 0.5V, VCESAT = 0.185V).
To calculate die junction temperature, use the appropriate
thermal resistance number and add in worst-case ambient
temperature:
TJ = TA + θJA PTOTAL
where TJ=Die Junction Temperature, TA=Ambient Tem-
perature, PTOTAL is the final result from the calculations
shown in Table 4, and
θJA is the thermal resistance from
the silicon junction to the ambient air.
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相關(guān)代理商/技術(shù)參數(shù) |
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|---|---|
| LT3579IUFD-1-TRPBF | 制造商:LINER 制造商全稱:Linear Technology 功能描述:6A Boost/Inverting DC/DC Converter with Fault Protection |
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| LT3579IUFD-TRPBF | 制造商:LINER 制造商全稱:Linear Technology 功能描述:6A Boost/Inverting DC/DC Converter with Fault Protection |
| LT3580 | 制造商:LINER 制造商全稱:Linear Technology 功能描述:Boost/Inverting DC/DC Converter with 2A Switch, Soft-Start, and Synchronization |
| LT3580EDD | 制造商:LINER 制造商全稱:Linear Technology 功能描述:Boost/Inverting DC/DC Converter with 2A Switch, Soft-Start, and Synchronization |
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