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| 型号： | LT3758EDD#PBF |
| 厂商： | Linear Technology |
| 文件页数： | 22/36页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR BST FLYBK INV 10DFN |
| 标准包装： | 121 |
| PWM 型： | 电流模式 |
| 输出数： | 1 |
| 频率 - 最大： | 1MHz |
| 电源电压： | 5.5 V ~ 100 V |
| 降压： | 无 |
| 升压： | 是 |
| 回扫： | 是 |
| 反相： | 是 |
| 倍增器： | 无 |
| 除法器： | 无 |
| Cuk： | 无 |
| 隔离： | 无 |
| 工作温度： | -40°C ~ 125°C |
| 封装/外壳： | 10-WFDFN 裸露焊盘 |
| 包装： | 管件 |
| 产品目录页面： | 1340 (CN2011-ZH PDF) |
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LT3758/LT3758A
APPLICATIONS INFORMATION
Accepting larger values of ?I L allows the use of low in-
ductances, but results in higher input current ripple and
greater core losses. It is recommended that c falls in the
range of 0.2 to 0.6.
where
c L1 =
? I L1
I L1(MAX)
I SW
I SW(MAX)
? I SW = χ ? I SW(MAX)
I L2(RMS) = I L2(MAX) ? 1 +
where
c 2L2
12
DT S
T S
t
c L2 =
? I L2
I L2 (MAX)
3758 F09
V IN(MIN)
0.5 ? ? I SW ? f
R SENSE =
V IN(MIN)
? I SW ? f
c 2L1
I L1(RMS) = I L1(MAX) ? 1 +
Figure9.TheSwitchCurrentWaveformoftheSEPICConverter
Given an operating input voltage range, and having chosen
the operating frequency and ripple current in the inductor,
the inductor value (L1 and L2 are independent) of the SEPIC
converter can be determined using the following equation:
L1 = L2 = ? D MAX
For most SEPIC applications, the equal inductor values
will fall in the range of 1μH to 100μH.
By making L1 = L2, and winding them on the same core,
the value of inductance in the preceding equation is re-
placed by 2L, due to mutual inductance:
L = ? D MAX
This maintains the same ripple current and energy storage
in the inductors. The peak inductor currents are:
I L1(PEAK) = I L1(MAX) + 0.5 ? ? I L1
I L2(PEAK) = I L2(MAX) + 0.5 ? ? I L2
The RMS inductor currents are:
12
Based on the preceding equations, the user should choose
the inductors having sufficient saturation and RMS cur-
rent ratings.
In a SEPIC converter, when the power switch is turned on,
the current flowing through the sense resistor (I SENSE ) is
the switch current.
Set the sense voltage at I SENSE(PEAK) to be the minimum
of the SENSE current limit threshold with a 20% margin.
The sense resistor value can then be calculated to be:
80 mV
I SW(PEAK)
SEPIC Converter: Power MOSFET Selection
For the SEPIC configuration, choose a MOSFET with a
V DC rating higher than the sum of the output voltage and
input voltage by a safety margin (a 10V safety margin is
usually sufficient).
The power dissipated by the MOSFET in a SEPIC con-
verter is:
P FET = I 2SW(MAX) ? R DS(ON) ? D MAX
+ 2 ? ( V IN(MIN) + V OUT ) 2 ? I L(MAX) ? C RSS ? f/1A
The first term in this equation represents the conduction
losses in the device, and the second term, the switching
loss. C RSS is the reverse transfer capacitance, which is
usually specified in the MOSFET characteristics.
For maximum efficiency, R DS(ON) and C RSS should be
minimized. From a known power dissipated in the power
3758afd
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相关代理商/技术参数 |
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| LT3758EDDTRPBF | 制造商:LINER 制造商全称:Linear Technology 功能描述:High Input Voltage, Boost, Flyback, SEPIC and Inverting Controller |
| LT3758EMSE#PBF | 功能描述:IC REG CTRLR PWM CM 10-MSOP RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 切换控制器 系列:- 特色产品:LM3753/54 Scalable 2-Phase Synchronous Buck Controllers 标准包装:1 系列:PowerWise® PWM 型:电压模式 输出数:1 频率 - 最大:1MHz 占空比:81% 电源电压:4.5 V ~ 18 V 降压:是 升压:无 回扫:无 反相:无 倍增器:无 除法器:无 Cuk:无 隔离:无 工作温度:-5°C ~ 125°C 封装/外壳:32-WFQFN 裸露焊盘 包装:Digi-Reel® 产品目录页面:1303 (CN2011-ZH PDF) 其它名称:LM3754SQDKR |
| LT3758EMSE#PBF | 制造商:Linear Technology 功能描述:DC-DC CONTROLLER INVERTING 1 制造商:Linear Technology 功能描述:DC-DC CONTROLLER, INVERTING, 1MHZ, MSOP- |
| LT3758EMSE#TRPBF | 功能描述:IC REG CTRLR PWM CM 10-MSOP RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 切换控制器 系列:- 标准包装:2,500 系列:- PWM 型:电流模式 输出数:1 频率 - 最大:500kHz 占空比:96% 电源电压:4 V ~ 36 V 降压:无 升压:是 回扫:无 反相:无 倍增器:无 除法器:无 Cuk:无 隔离:无 工作温度:-40°C ~ 125°C 封装/外壳:24-WQFN 裸露焊盘 包装:带卷 (TR) |
| LT3758EMSEPBF | 制造商:Linear Technology 功能描述:100V Flyback SEPIC Controller MSOP10EP |
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