参数资料
| 型号： | LT3741EUF#PBF |
| 厂商： | Linear Technology |
| 文件页数： | 13/24页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR BUCK PWM CM 20-QFN |
| 标准包装： | 91 |
| PWM 型： | 电流模式 |
| 输出数： | 1 |
| 频率 - 最大： | 1.07MHz |
| 电源电压： | 6 V ~ 36 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： | -40°C ~ 125°C |
| 封装/外壳： | 20-WFQFN 裸露焊盘 |
| 包装： | 管件 |
| 产品目录页面： | 1332 (CN2011-ZH PDF) |
LT3741/LT3741-1
APPLICATIONS INFORMATION
I O =
? V IN ? V O – V O2 ?
L = ? ?
( 0.05V ) 2
R S
Programming Inductor Current
The analog voltage at the CTRL1 pin is buffered and
produces a reference voltage, V CTRL , across an internal
resistor. The regulated average inductor current is deter-
mined by:
V CTRL1
30 ? R S
where R S is the external sense resistor and I O is the aver-
age inductor current, which is equal to the output current.
Figure 2 shows the maximum output current vs R S . The
maximum power dissipation in the resistor will be:
P RS =
Table 1 contains several resistors values, the corresponding
maximum current and power dissipation in the sense resis-
tor. Susumu, Panasonic and Vishay offer accurate sense
resistors. Figure 3 shows the power dissipation in R S .
Inductor Selection
Size the inductor to have approximately 30% peak-to-
peak ripple. The overcurrent set point is equal to the
high level regulated current level set by the CTRL1 pin
with an additional 23mV offset between the SENSE + and
SENSE – pins. The saturation current for the inductor
should be at least 20% higher than the maximum regulated
current. The following equation sizes the inductor for best
performance:
? 0.3 ? f S ? I O ? V IN ?
where V O is the output voltage, I O is the maximum regulated
current in the inductor and f S is the switching frequency.
Using this equation, the inductor will have approximately
15% ripple at maximum regulated current.
Table 2. Recommended Inductor Manufacturers
VENDOR WEBSITE
Coilcraft www.coilcraft.com
Table 1. Sense Resistor Values
Sumida
www.sumida.com
MAXIMUM OUTPUT
CURRENT (A) RESISTOR, R S (mΩ)
POWER DISSIPATION (W)
Vishay
Würth Electronics
www.vishay.com
www.we-online.com
1
5
10
25
50
10
5
2
0.05
0.25
0.5
1.25
NEC-Tokin
1.4
1.2
www.nec-tokin.com
30
25
20
15
1.0
0.8
0.6
0.4
0.2
10
0
0
2
4
6
8 10 12
14 16 18 20
5
R S (m )
3741 F03
0
0
2
4
6
8
10 12 14 16 18 20
Figure 3. Power Dissipation in R S
R S (m )
3741 F02
Switching MOSFET Selection
Figure 2. R S Value Selection for Regulated Output Current
When selecting switching MOSFETs, the following
parameters are critical in determining the best devices for
a given application: total gate charge (Q G ), on-resistance
37411fe
For more information www.linear.com/LT3741
13
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LT3741EUF-TRPBF | 制造商:LINER 制造商全称:Linear Technology 功能描述:High Power, Constant Current, Constant Voltage, Step-Down Controller |
| LT3741IFE#PBF | 功能描述:IC REG CTRLR BUCK PWM CM 20TSSOP 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:4,500 系列:PowerWise® PWM 型:控制器 输出数:1 频率 - 最大:1MHz 占空比:95% 电源电压:2.8 V ~ 5.5 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:-40°C ~ 125°C 封装/外壳:6-WDFN 裸露焊盘 包装:带卷 (TR) 配用:LM1771EVAL-ND - BOARD EVALUATION LM1771 其它名称:LM1771SSDX |
| LT3741IFE#TRPBF | 功能描述:IC REG CTRLR BUCK PWM CM 20TSSOP 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:4,500 系列:PowerWise® PWM 型:控制器 输出数:1 频率 - 最大:1MHz 占空比:95% 电源电压:2.8 V ~ 5.5 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:-40°C ~ 125°C 封装/外壳:6-WDFN 裸露焊盘 包装:带卷 (TR) 配用:LM1771EVAL-ND - BOARD EVALUATION LM1771 其它名称:LM1771SSDX |
| LT3741IFE-PBF | 制造商:LINER 制造商全称:Linear Technology 功能描述:High Power, Constant Current, Constant Voltage, Step-Down Controller |
| LT3741IFE-TRPBF | 制造商:LINER 制造商全称:Linear Technology 功能描述:High Power, Constant Current, Constant Voltage, Step-Down Controller |
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