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参数资料
| 型号： | LT3759HMSE#PBF |
| 厂商： | Linear Technology |
| 文件页数： | 14/32页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR BST INV PWM 12-MSOP |
| 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 ~ 150°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
V OUT 1
I L(PEAK) = I L(MAX) ? ? 1 + ?
V OUT ? V IN(MIN)
D MAX =
I L(RMS) = I L(MAX) ? 1 +
R SENSE ? V IN(MIN)
Theselectionofswitchingfrequencyisthestartingpoint.
The maximum frequency that can be used is based on the
maximum duty cycle. The conversion ratio as a function
of duty cycle is:
=
V IN 1 ? D
in continuous conduction mode (CCM). The equations
that follow assume CCM operation.
For a boost converter operating in CCM, the duty cycle
of the main switch can be calculated based on the 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
The alternative to CCM, discontinuous conduction mode
(DCM) is not limited by duty cycle to provide high con-
version ratios at a given frequency. The price one pays
is reduced efficiency and substantially higher switching
current.
Boost Converter: Inductor and Sense Resistor Selection
For the boost topology, the maximum average inductor
current is:
converter will approach voltage mode). Accepting larger
values of ΔI L provides fast transient response and allows
the use of low inductances, but results in higher input
current ripple and greater core losses. It is recommended
that χ falls within the range of 0.2 to 0.6.
The peak and RMS inductor current are:
? χ ?
? 2 ?
χ 2
12
The inductor used with the LT3759 should have a saturation
current rating appropriate to the maximum switch current
selected with the R SENSE resistor. Choose an inductor value
based on operating frequency, input and output voltage
to provide a current mode ramp on SENSE during the
switch on-time of approximately 10mV magnitude. The
following equation is useful to estimate the inductor value
for continuous conduction mode operation:
L = ? D MAX
0.01V ? f OSC
Set the sense voltage at I L(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:
I L(MAX) = I O(MAX) ?
1
1 ? D MAX
R SENSE =
40mV
I L(PEAK)
D I L = c ? I L(MAX) = c ? I O(MAX) ?
Then,theripplecurrentcanbecalculatedby:
1
1 - D MAX
The constant χ in the preceding equation represents the
percentage peak-to-peak ripple current in the inductor,
relative to I L(MAX) .
The inductor ripple current has a direct effect on the choice
of inductor value. Choosing smaller values of ΔI L requires
large inductances and reduces the current loop gain (the
Boost Converter: Power MOSFET Selection
Important parameters for the power MOSFET include the
drain-source voltage rating (V DS ), the threshold voltage
(V GS(TH) ), the on-resistance (R DS(ON) ), the gate to source
and gate to drain charges (Q GS and Q GD ), the maximum
drain current (I D(MAX) ) and the MOSFET’s thermal resis-
tances (R θ JC and R θ JA ).
The power MOSFET will see full output voltage, plus a
diode forward voltage, and any additional ringing across
its drain-to-source during its off-time. It is recommended
3759fc
14
For more information www.linear.com/3759
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| 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) |
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| LT375-C | 制造商:EDSYN 功能描述: |
| LT376 | 制造商:EDSYN 功能描述: 制造商:EDSYN 功能描述:SOLDERING TIP, Tip / Nozzle Length:0.48" |
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