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| 型号： | LT3757EDD#PBF |
| 厂商： | Linear Technology |
| 文件页数： | 24/36页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR BST FLYBK INV 10DFN |
| 产品培训模块： | LT3757 and LT3758 - Boost, Flyback, SEPIC and Inverting Controllers |
| 特色产品： | LT3757 - Inverting Controller |
| 标准包装： | 121 |
| PWM 型： | 电流模式 |
| 输出数： | 1 |
| 频率 - 最大： | 1MHz |
| 电源电压： | 2.9 V ~ 40 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： | 1332 (CN2011-ZH PDF) |
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LT3757/LT3757A
APPLICATIONS INFORMATION
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 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:
I D(PEAK) = ? 1 + ? ? I O(MAX) ?
? 2 ?
? c ?
1
1 ? D MAX
I RMS(CDC) > I O(MAX) ?
V OUT + V D
V IN(MIN)
V OUT ? V D D
1 ? D
V IN
+ –
–
+
D1 C OUT
GATE
+
+
GND
Itisrecommendedthatthepeakrepetitivereversevoltage
rating V RRM is higher than V OUT + V IN(MAX) by a safety
margin (a 10V safety margin is usually sufficient).
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.
SEPIC Converter: Output and Input Capacitor Selection
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
A low ESR and ESL, X5R or X7R ceramic capacitor works
well for C DC .
INVERTING CONVERTER APPLICATIONS
The LT3757 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).
L1 C DC L2
V IN
C IN LT3757
M1
V OUT
SENSE
R SENSE
3757 F09
Figure 10. A Simplified Inverting Converter
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)
3757afd
24
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LT3757EDD-TRPBF | 制造商:LINER 制造商全称:Linear Technology 功能描述:Boost, Flyback, SEPIC and Inverting Controller |
| LT3757EMSE | 制造商:LINER 制造商全称:Linear Technology 功能描述:Boost, Flyback, SEPIC and Inverting Controller |
| LT3757EMSE#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 |
| LT3757EMSE#PBF | 制造商:Linear Technology 功能描述:DC-DC CONTROLLER SEPIC 1MHZ 制造商:Linear Technology 功能描述:DC-DC CONTROLLER, SEPIC, 1MHZ, MSOP-10 |
| LT3757EMSE#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) |
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