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| 型号： | LT3573IMSE#PBF |
| 厂商： | Linear Technology |
| 文件页数： | 17/26页 |
| 文件大小： | 0K |
| 描述： | IC REG FLYBACK ISO ADJ 16MSOP |
| 产品培训模块： | LT3573 Flyback Voltage Converter |
| 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 60V |
| 输入电压： | 3 V ~ 40 V |
| PWM 型： | 电流模式，混合 |
| 频率 - 开关： | 40kHz ~ 1MHz |
| 电流 - 输出： | 1.25A |
| 同步整流器： | 无 |
| 工作温度： | -40°C ~ 125°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 16-TFSOP（0.118"，3.00mm 宽）裸露焊盘 |
| 包装： | 管件 |
| 供应商设备封装： | 16-MSOP，裸露焊盘 |
| 产品目录页面： | 1332 (CN2011-ZH PDF) |
| 配用： | 732-3307-ND - BOARD EVAL FOR LT3573 |
| 相关产品： | 732-2669-2-ND - TRANS FLYBACK LT3748 20UH SMD 732-2669-6-ND - TRANS FLYBACK LT3748 20UH SMD 732-2668-6-ND - TRANS FLYBACK LT3748 14UH SMD 732-2667-6-ND - TRANS FLYBACK LT3748 500UH SMD 732-2666-6-ND - TRANS FLYBACK LT3748 12UH SMD 732-2665-6-ND - TRANS FLYBACK LT3748 12UH SMD 732-2664-6-ND - TRANS FLYBACK LT3748 15UH SMD 732-2663-6-ND - TRANS FLYBACK LT3748 15UH SMD 732-2662-6-ND - TRANS FLYBACK LT3748 8UH SMD 732-2661-6-ND - TRANS FLYBACK LT3748 8UH SMD 更多... |
LT3573
APPLICATIONS INFORMATION
L S I 2PK f SW = C
Zenerclamps.Amongthem,RCDiswidelyused.Figure9
shows the RCD snubber in a flyback converter.
A typical switch node waveform is shown in Figure 10.
During switch turn-off, the energy stored in the leakage
inductance is transferred to the snubber capacitor, and
eventually dissipated in the snubber resistor.
1 V (V C ? N ? V OUT )
2 R
The snubber resistor affects the spike amplitude V C and
duration t SP , the snubber resistor is adjusted such that
t SP is about 150ns. Prolonged t SP may cause distortion
to the output voltage sensing.
The previous steps finish the flyback power stage design.
5. Select the feedback resistor for proper output
voltage.
Using the resistor Tables 1-4, select the feedback resis-
tor R FB , and program the output voltage to 5V. Adjust the
L S
R TC resistor for temperature compensation of the output
voltage. R REF is selected as 6.04k.
A small capacitor in parallel with R REF filters out the noise
during the voltage spike, however, the capacitor should
limit to 10pF. A large capacitor causes distortion on volt-
age sensing.
6. Optimize the compensation network to improve the
transient performance.
The transient performance is optimized by adjusting the
compensation network. For best ripple performance, select
a compensation capacitor not less than 1nF, and select a
compensation resistor not greater than 50k.
7. Current limit resistor, soft-start capacitor and UVLO
resistor divider
Use the current limit resistor R LIM to lower the current
limit if a compact transformer design is required. Soft-start
capacitor helps during the start-up of the flyback converter.
Select the UVLO resistor divider for intended input opera-
tion range. These equations are aforementioned.
–
+
C
R
V C
NV OUT
D
V IN
3573 F09
t SP
3573 F10
Figure 9. RCD Snubber in a Flyback Converter
Figure 10. Typical Switch Node Waveform
3573fd
For more information www.linear.com/LT3573
17
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LT3573IMSETRPBF | 制造商:LINER 制造商全称:Linear Technology 功能描述:Isolated Flyback Converter without an Opto-Coupler |
| LT3573IMSE-TRPBF | 制造商:LINER 制造商全称:Linear Technology 功能描述:Isolated Flyback Converter Without an Opto-Coupler |
| LT3574 | 制造商:LINER 制造商全称:Linear Technology 功能描述:Isolated Flyback Converter Without an Opto-Coupler |
| LT3574EMS | 制造商:LINER 制造商全称:Linear Technology 功能描述:Isolated Flyback Converter Without an Opto-Coupler |
| LT3574EMS#PBF | 功能描述:IC REG FLYBK ISO ADJ .65A 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 |
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