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参数资料
| 型号： | LT3757IDD#PBF |
| 厂商： | Linear Technology |
| 文件页数： | 20/36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 |
| 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 |
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LT3757/LT3757A
APPLICATIONS INFORMATION
C CN =
R SENSE =
where V SN is the snubber capacitor voltage. A smaller
V SN results in a larger snubber loss. A reasonable V SN is
2 to 2.5 times of:
V OUT ? N P
N S
L LK is the leakage inductance of the primary winding, which
is usually specified in the transformer characteristics. L LK
can be obtained by measuring the primary inductance with
the secondary windings shorted. The snubber capacitor
value (C CN ) can be determined using the following equation:
V SN
? V SN ? R CN ? f
where ?V SN is the voltage ripple across C CN . A reasonable
?V SN is 5% to 10% of V SN . The reverse voltage rating of
D SN should be higher than the sum of V SN and V IN(MAX) .
Flyback Converter: Sense Resistor Selection
In a flyback converter, when the power switch is turned
on, the current flowing through the sense resistor
(I SENSE ) is:
I SENSE = I LP
Set the sense voltage at I LP(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:
80mV
I LP(PEAK)
Flyback Converter: Power MOSFET Selection
For the flyback configuration, the MOSFET is selected with
a V DC rating high enough to handle the maximum V IN , the
reflected secondary voltage and the voltage spike due to
the leakage inductance. Approximate the required MOSFET
V DC rating using:
BV DSS > V DS(PEAK)
where:
V DS(PEAK) = V IN(MAX) + V SN
The power dissipated by the MOSFET in a flyback con-
verter is:
P FET = I 2M(RMS) ? R DS(ON) + 2 ? V 2DS(PEAK) ? I L(MAX) ?
C RSS ? f /1A
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.
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.
3757afd
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LT3757IDD-TRPBF | 制造商:LINER 制造商全称:Linear Technology 功能描述:Boost, Flyback, SEPIC and Inverting Controller |
| LT3757IMSE | 制造商:Linear Technology 功能描述:DC DC Cntrlr Single-OUT Flyback Controller 2.9V to 40V Input 10-Pin MSOP EP 制造商:Linear Technology 功能描述:CONTROLLER |
| LT3757IMSE#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:- 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) |
| LT3757IMSE#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) |
| LT3757IMSEPBF | 制造商:Linear Technology 功能描述:Boost Flyback SEPIC Controller MSOP10EP |
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