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| 型号： | LT3759HMSE#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 21/32页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR BST INV PWM 12-MSOP |
| 标准包装： | 2,500 |
| 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： | 带卷 (TR) |
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LT3759
APPLICATIONS INFORMATION
The inductor ripple currents ΔI L1 and ΔI L2 are identical:
D I L1 = D I L2 = 0.5 ? D I SW
By making L1 = L2, and winding them on the same core, the
value of inductance in the preceding equation is replaced
by 2L, due to mutual inductance:
I SW
? I SW = χ ? I SW(MAX)
L =
V IN(MIN)
D I SW ? f OSC
? D MAX
I SW(MAX)
=
R SENSE ? V IN(MIN)
0.01V ? f OSC
? D MAX
DT S
R SENSE =
t
T S
3759 F08
Figure 8. The Switch Current Waveform of a SEPIC Converter
The inductor ripple current has a direct effect on the
choice of the inductor value. Choosing smaller values of
ΔI L requires large inductances and reduces the current
loop gain (the converter will approach voltage mode).
Accepting larger values of ΔI L allows the use of low in-
ductances, but results in higher input current ripple and
greater core losses. It is recommended that χ falls in the
range of 0.2 to 0.4.
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 inductor value (L1 and L2 are
independent) of the SEPIC converter can be determined
using the following equation:
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 minimum of
the SENSE current limit threshold with a 20% margin. The
sense resistor value can then be calculated to be:
40mV
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 converter
is:
P FET = I 2SW(MAX) ? R DS(ON) ? D MAX
V IN(MIN)
0.5 ? D I SW ? f OSC
R SENSE ? V IN(MIN)
0.5 ? 0.01V ? f OSC
f OSC
? C RSS ?
L1 = L2 =
= ? D MAX
? D MAX
+ (V IN(MIN) + V OUT ) 2 ? I SW(MAX)
1A
For most SEPIC applications, the equal inductor values
will fall in the range of 1μH to 100μH.
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.
3759fc
For more information www.linear.com/3759
21
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相关代理商/技术参数 |
参数描述 |
|---|---|
| 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 |
| 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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