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| 型号： | LT3511MPMS#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 18/26页 |
| 文件大小： | 0K |
| 描述： | IC REG FLYBK ISO ADJ .24A 16MSOP |
| 标准包装： | 2,500 |
| 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： | 带卷 (TR) |
| 供应商设备封装： | 16-MSOP |
LT3511
APPLICATIONS INFORMATION
Example:
Design for ripple levels below 50mV.
Step 7: Compensation.
Compensation will be optimized towards the end of the de-
C =
0.1A ? 0.39
0.05V ? 256kHz
= 3.1μF
sign procedure. Connect a resistor and capacitor from the
VC node to ground. Use a 20k resistor and a 2.2nF capacitor.
A 10μF, 25V output capacitor is chosen. Remember ce-
ramic capacitors lose capacitance with applied voltage.
The capacitance can drop to 40% of quoted capacitance
Step 8: Select R FB and R TC Resistors.
Use the following equations to choose starting values for
R FB and R TC . Set R REF to 10k.
at the max voltage rating.
Step 6: Design clamp circuit.
R FB =
( V OUT + V F + 0.55V ) ? N PS ? R REF
1.2V
The clamp circuit protects the switch from leakage induc-
R REF = 10k
tance spike. A DZ clamp is the preferred clamp circuit. The
Zener and the diode need to be chosen.
The maximum Zener value is set according to the maxi-
mum V IN :
V ZENER(MAX) ≤ 150V – V IN(MAX)
Example:
R TC =
Example:
R FB =
R FB
N PS
( 15 + 0.5 + 0.55V ) ? 2 ? 10k = 267k
1.2V
V ZENER(MAX) ≤ 150V – 72V
V ZENER(MAX) ≤ 78V
R TC =
267k
2
= 133k
R FB(NEW) =
? R FB(OLD)
In addition, power loss in the clamp circuit is inversely
related to the clamp voltage as shown previously. Higher
clamp voltages lead to lower power loss.
A 68V Zener with a maximum of 72V will provide optimal
protection and minimize power loss. Half-watt Zeners will
satisfy most clamp applications involving the LT3511.
Power loss can be calculated using the equations presented
in the Leakage Inductance and Clamp Circuit section.
The Zener chosen is a 68V 0.5W Zener from On Semicon-
Step 9: Adjust RFB based on output voltage.
Power up the application with application components
connected and measure the regulated output voltage.
Readjust R FB based on the measured output voltage.
V OUT
V OUT(MEAS)
Example:
ductor (MMSZ5266BT1G).
Choose a diode that is fast and has sufficient reverse
R FB(NEW) =
15V
16.8V
? 267k = 237k
voltage breakdown:
V REVERSE > V SW(MAX)
V SW(MAX) = V IN(MAX) + V ZENER(MAX)
Example:
V REVERSE > 140V
The diode needs to handle the peak switch current of the
switch which was determined to be 0.24A. A 200V, 0.6A
Step 10: Remove R TC and measure output voltage over
temperature.
Measure output voltage in a controlled temperature envi-
ronment like an oven to determine the output temperature
coefficient. Measure output voltage at a consistent load
current and input voltage, across the temperature range
of operation. This procedure will optimize line and load
regulation over temperature.
diode from Diodes Inc. (BAV21W) is chosen.
3511fc
18
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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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