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LT3573EMSETRPBF

更新时间： 2024-02-05 08:23:21
品牌 Logo 应用领域
凌特 - Linear 转换器光电
页数 文件大小 规格书
26页 1060K
描述
Isolated Flyback Converter without an Opto-Coupler

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中文翻译

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LT3573EMSETRPBF 技术参数

是否Rohs认证： 符合生命周期：Transferred
零件包装代码：MSOP包装说明：HTSSOP, TSSOP16,.19,20
针数：16Reach Compliance Code：compliant
ECCN代码：EAR99HTS代码：8542.39.00.01
风险等级：5.17模拟集成电路 - 其他类型：SWITCHING REGULATOR
控制模式：CURRENT-MODE最大输入电压：40 V
最小输入电压：3 V标称输入电压：12 V
JESD-30 代码：R-PDSO-G16JESD-609代码：e3
长度：4.039 mm湿度敏感等级：1
功能数量：1端子数量：16
最高工作温度：125 °C最低工作温度：-40 °C
最大输出电流：1.85 A封装主体材料：PLASTIC/EPOXY
封装代码：HTSSOP封装等效代码：TSSOP16,.19,20
封装形状：RECTANGULAR封装形式：SMALL OUTLINE, HEAT SINK/SLUG, THIN PROFILE, SHRINK PITCH
峰值回流温度（摄氏度）：260认证状态：Not Qualified
座面最大高度：1.1 mm子类别：Switching Regulator or Controllers
表面贴装：YES切换器配置：BUCK-BOOST
最大切换频率：1000 kHz技术：BIPOLAR
温度等级：AUTOMOTIVE端子面层：Matte Tin (Sn)
端子形式：GULL WING端子节距：0.5 mm
端子位置：DUAL处于峰值回流温度下的最长时间：30
宽度：3 mmBase Number Matches：1

LT3573EMSETRPBF 数据手册

 浏览型号LT3573EMSETRPBF的Datasheet PDF文件第4页浏览型号LT3573EMSETRPBF的Datasheet PDF文件第5页浏览型号LT3573EMSETRPBF的Datasheet PDF文件第6页浏览型号LT3573EMSETRPBF的Datasheet PDF文件第8页浏览型号LT3573EMSETRPBF的Datasheet PDF文件第9页浏览型号LT3573EMSETRPBF的Datasheet PDF文件第10页 
LT3573  
operation  
The LT3573 is a current mode switching regulator IC  
designed specifically for the isolated flyback topology.  
The special problem normally encountered in such cir‑  
cuits is that information relating to the output voltage on  
the isolated secondary side of the transformer must be  
communicated to the primary side in order to maintain  
regulation. Historically, this has been done with optoisola‑  
tors or extra transformer windings. Optoisolator circuits  
waste output power and the extra components increase  
the cost and physical size of the power supply. Optoiso‑  
lators can also exhibit trouble due to limited dynamic  
response, nonlinearity, unit‑to‑unit variation and aging  
over life. Circuits employing extra transformer windings  
also exhibit deficiencies. Using an extra winding adds to  
the transformer’s physical size and cost, and dynamic  
response is often mediocre.  
The LT3573 features a boundary mode control method,  
where the part operates at the boundary between continu‑  
ousconductionmodeanddiscontinuousconductionmode.  
TheV pincontrolsthecurrentleveljustasitdoesinnormal  
C
current mode operation, but instead of turning the switch  
on at the start of the oscillator period, the part detects  
when the secondary side winding current is zero.  
Boundary Mode Operation  
Boundary mode is a variable frequency, current‑mode  
switching scheme. The switch turns on and the inductor  
currentincreasesuntilaV pincontrolledcurrentlimit.The  
C
voltage on the SW pin rises to the output voltage divided  
by the secondary‑to‑primary transformer turns ratio plus  
the input voltage. When the secondary current through  
the diode falls to zero, the SW pin voltage falls below V .  
IN  
A discontinuous conduction mode (DCM) comparator  
detects this event and turns the switch back on.  
The LT3573 derives its information about the isolated  
output voltage by examining the primary side flyback  
pulse waveform. In this manner, no optoisolator nor extra  
transformer winding is required for regulation. The output  
voltageiseasilyprogrammedwithtworesistors.Sincethis  
IC operates in boundary control mode, the output voltage  
is calculated from the switch pin when the secondary cur‑  
rent is almost zero. This method improves load regulation  
without external resistors and capacitors.  
Boundary mode returns the secondary current to zero  
every cycle, so the parasitic resistive voltage drops do not  
cause load regulation errors. Boundary mode also allows  
the use of a smaller transformer compared to continuous  
conduction mode and no subharmonic oscillation.  
At low output currents the LT3573 delays turning on the  
switch, and thus operates in discontinuous mode. Unlike  
a traditional flyback converter, the switch has to turn on  
to update the output voltage information. Below 0.6V on  
The Block Diagram shows an overall view of the system.  
Many of the blocks are similar to those found in traditional  
switching regulators including: internal bias regulator,  
oscillator, logic, current amplifier and comparator, driver,  
and output switch. The novel sections include a special  
flyback error amplifier and a temperature compensation  
circuit. In addition, the logic system contains additional  
logic for boundary mode operation, and the sampling  
error amplifier.  
the V pin, the current comparator level decreases to  
C
its minimum value, and the internal oscillator frequency  
decreases in frequency. With the decrease of the internal  
oscillator, the part starts to operate in DCM. The output  
current is able to decrease while still allowing a minimum  
switch off‑time for the error amp sampling circuitry. The  
typical minimum internal oscillator frequency with V  
equal to 0V is 40kHz.  
C
3573fb  
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中文翻译

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