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| 型号： | LT3511MPMS#PBF |
| 厂商： | Linear Technology |
| 文件页数： | 17/26页 |
| 文件大小： | 0K |
| 描述： | IC REG FLYBK ISO ADJ .24A 16MSOP |
| 标准包装： | 37 |
| 类型： | 回扫，隔离 |
| 输出类型： | 可调式 |
| 输出数： | 1 |
| 输出电压： | 可调至 150V |
| 输入电压： | 4.5 V ~ 100 V |
| PWM 型： | 电流模式，混合 |
| 频率 - 开关： | 40kHz ~ 650kHz |
| 电流 - 输出： | 240mA |
| 同步整流器： | 无 |
| 工作温度： | -55°C ~ 150°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 16-TFSOP（0.118"，3.00mm），12 引线 |
| 包装： | 管件 |
| 供应商设备封装： | 16-MSOP |
LT3511
APPLICATIONS INFORMATION
400ns ? 2 ? ( 15 + 0.5 )
Example:
L PRI ≥
L PRI ≥ 225μH
0.055
Ensure that the saturation current covers steady-state
operation, start-up and transient conditions. To satisfy
these conditions, choose a saturation current 50% or more
higher than the steady-state calculation. In this example, a
saturation current between 400mA and 500mA is chosen.
L PRI ≥
100ns ? 72
0.055
Table 1 presents a list of pre-designed flyback transform-
ers. For this application, the Würth 750311660 transformer
will be used.
L PRI ≥ 131μH
In addition, primary inductance will determine switching
frequency.
Step 4: Choose the correct output diode.
The two main criteria for choosing the output diode include
forward current rating and reverse voltage rating. The
=
= OUT
I RMS = I PEAK(VIN(MIN)) ? N PS ?
f SW =
I PEAK
1
t ON + t OFF L PRI ? I PEAK
V ? I OUT ? 2
η ? V IN ? D
V IN
+
1
L PRI ? I PEAK
N PS ? ( V OUT + V F )
maximum load requirement is a good first-order guess
at the average current requirement for the output diode.
A better metric is RMS current.
1 – D VIN(MIN)
3
Example:
Example:
Let’s calculate switching frequency at our nominal V IN
of 48V.
I RMS = 0.24 ? 2 ?
1 – 0.46
3
= 0.2A
( ) ? 2 = 0.39
D =
I PEAK =
= 0.21A
V REVERSE = V OUT +
15 + 0.5
( 15 + 0.5 ) ? 2 + 48
15V ? 0.1A ? 2
0.75 ? 48V ? 0.39
Next calculate reverse voltage requirement using maxi-
mum V IN :
V IN(MAX)
N PS
Let’s choose L PRI = 350μH. Remember, most transform-
ers specify primary inductance with a tolerance of ±20%.
f SW = 256kHz
Example:
V REVERSE = 15V +
72V
2
= 51V
= OUT
V ? I OUT ? 2
η ? V IN ? D
Finally, the transformer needs to be rated for the correct
saturation current level across line and load conditions.
In the given example, the worst-case condition for switch
current is at minimum V IN and maximum load.
I PEAK
A 0.5A, 60V diode from Diodes Inc. (SBR0560S1) will
be used.
Step 5: Choose an output capacitor.
The output capacitor choice should minimize output voltage
ripple and balance the trade-off between size and cost for
a larger capacitor. Use the equation below at nominal V IN :
I PEAK
=
15V ? 0.1A ? 2
0.75 ? 36V ? 0.46
= 0.24A
C =
I OUT ? D
Δ V OUT ? f SW
3511fc
17
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LT3512 | 制造商:LINER 制造商全称:Linear Technology 功能描述:Monolithic High Voltage Isolated Flyback Converter |
| LT3512_11 | 制造商:LINER 制造商全称:Linear Technology 功能描述:Monolithic High Voltage Isolated Flyback Converter |
| LT3512EMS#PBF | 功能描述:IC REG FLYBK ISO ADJ .42A 16MSOP RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 开关稳压器 系列:- 标准包装:250 系列:- 类型:降压（降压） 输出类型:固定 输出数:1 输出电压:1.2V 输入电压:2.05 V ~ 6 V PWM 型:电压模式 频率 - 开关:2MHz 电流 - 输出:500mA 同步整流器:是 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:6-UFDFN 包装:带卷 (TR) 供应商设备封装:6-SON（1.45x1） 产品目录页面:1032 (CN2011-ZH PDF) 其它名称:296-25628-2 |
| LT3512EMS#TRPBF | 功能描述:IC REG FLYBK ISO ADJ .42A 16MSOP RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 开关稳压器 系列:- 标准包装:2,500 系列:- 类型:降压（降压） 输出类型:固定 输出数:1 输出电压:1.2V，1.5V，1.8V，2.5V 输入电压:2.7 V ~ 20 V PWM 型:- 频率 - 开关:- 电流 - 输出:50mA 同步整流器:是 工作温度:-40°C ~ 125°C 安装类型:表面贴装 封装/外壳:10-TFSOP，10-MSOP（0.118"，3.00mm 宽）裸露焊盘 包装:带卷 (TR) 供应商设备封装:10-MSOP 裸露焊盘 |
| LT3512EMSPBF | 制造商:LINER 制造商全称:Linear Technology 功能描述:Monolithic High Voltage Isolated Flyback Converter |
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