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参数资料
| 型号： | LT3758EDD#PBF |
| 厂商： | Linear Technology |
| 文件页数： | 23/36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
V OUT + V D
I RMS(CDC) > I O(MAX) ?
I D(PEAK) = ? 1 + ? ? I O(MAX) ?
V OUT ? V D D
1 ? D
V IN
MOSFET,itsjunctiontemperaturecanbeobtainedusing
the following equation:
T J = T A + P FET ? θ JA = T A + P FET ? ( θ JC + θ CA )
T J must not exceed the MOSFET maximum junction
temperature rating. It is recommended to measure the
MOSFET temperature in steady state to ensure that absolute
maximum ratings are not exceeded.
SEPIC Converter: Output Diode Selection
To maximize efficiency, a fast switching diode with a low
forward drop and low reverse leakage is desirable. The
average forward current in normal operation is equal to
the output current, and the peak current is equal to:
? c ? 1
? 2 ? 1 ? D MAX
It is recommended that the peak repetitive reverse voltage
rating V RRM is higher than V OUT + V IN(MAX) by a safety
margin (a 10V safety margin is usually sufficient).
C DC has nearly a rectangular current waveform. During
the switch off-time, the current through C DC is I IN , while
approximately –I O flows during the on-time. The RMS
rating of the coupling capacitor is determined by the fol-
lowing equation:
V IN(MIN)
A low ESR and ESL, X5R or X7R ceramic capacitor works
well for C DC .
INVERTING CONVERTER APPLICATIONS
The LT3758 can be configured as a dual-inductor inverting
topology, as shown in Figure 10. The V OUT to V IN ratio is:
=?
in continuous conduction mode (CCM).
The power dissipated by the diode is:
P D = I O(MAX) ? V D
and the diode junction temperature is:
T J = T A + P D ? R θ JA
The R θ JA used in this equation normally includes the R θ JC
for the device, plus the thermal resistance from the board,
to the ambient temperature in the enclosure. T J must not
exceed the diode maximum junction temperature rating.
V IN
+
L1
C IN
LT3758
GATE
SENSE
GND
C DC
+ –
M1
R SENSE
D1
L2
C OUT
+
–
V OUT
+
3758 F10
D MAX =
SEPICConverter:OutputandInputCapacitorSelection
The selections of the output and input capacitors of the
SEPIC converter are similar to those of the boost converter.
Please refer to the Boost Converter: Output Capacitor
Selection and Boost Converter: Input Capacitor Selection
sections.
SEPIC Converter: Selecting the DC Coupling Capacitor
The DC voltage rating of the DC coupling capacitor (C DC ,
as shown in Figure 1) should be larger than the maximum
input voltage:
V CDC > V IN(MAX)
Figure 10. A Simplified Inverting Converter
Inverting Converter: Switch Duty Cycle and Frequency
For an inverting converter operating in CCM, the duty
cycle of the main switch can be calculated based on the
negative output voltage (V OUT ) and the input voltage (V IN ).
The maximum duty cycle (D MAX ) occurs when the converter
has the minimum input voltage:
V OUT ? V D
V OUT ? V D ? V IN(MIN)
3758afd
23
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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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