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参数资料
| 型号： | LT3759EMSE#PBF |
| 厂商： | Linear Technology |
| 文件页数： | 22/32页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR BST INV PWM 12-MSOP |
| 产品培训模块： | LT3759 DC to DC Controller |
| 标准包装： | 37 |
| PWM 型： | 电流模式 |
| 输出数： | 1 |
| 频率 - 最大： | 1MHz |
| 电源电压： | 1.6 V ~ 42 V |
| 降压： | 无 |
| 升压： | 是 |
| 回扫： | 无 |
| 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： | 12-TSSOP （0.118"，3.00mm 宽）裸露焊盘 |
| 包装： | 管件 |
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LT3759
APPLICATIONS INFORMATION
I RMS(CDC) ≥ I O(MAX) ?
I D(PEAK) = ? 1 + ? ? I O(MAX) ?
V OUT – V D D
For maximum efficiency, R DS(ON) and C RSS should be
minimized. From a known power dissipated in the power
MOSFET, its junction temperature can be obtained using
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:
? χ ? 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).
The power dissipated by the diode is:
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 rated for the maximum
input voltage:
C DC ≥ V IN(MAX)
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 OUT + V D
V IN(MIN)
A low ESR and ESL, X5R or X7R ceramic capacitor works
well for C DC .
INVERTING CONVERTER APPLICATIONS
The LT3759 can be configured as a dual-inductor inverting
topology, as shown in Figure 9. The V OUT to V IN ratio is:
=
V IN 1 ? D
In continuous conduction mode (CCM).
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
LT3759
GATE
SENSE
GND
C DC
+ –
M1
R SENSE
D1
L2
+
–
C OUT
V OUT
+
3759 F09
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.
Figure 9. A Simplified Inverting Converter
3759fc
22
For more information www.linear.com/3759
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LT3759HMSE#PBF | 功能描述:IC REG CTRLR BST INV PWM 12-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) |
| LT3759HMSE#TRPBF | 功能描述:IC REG CTRLR BST INV PWM 12-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) |
| LT3759IMSE#PBF | 功能描述:IC REG CTRLR BST INV PWM 12-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) |
| LT3759IMSE#TRPBF | 功能描述:IC REG CTRLR BST INV PWM 12-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) |
| LT375B | 制造商:EDSYN 功能描述:TIP SPADE 1.5X12.2MM |
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