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LT3573IMSE#TRPBF

更新时间： 2024-02-19 19:00:38

品牌	Logo	应用领域
凌特 - Linear		转换器
页数	文件大小	规格书
26页	271K
描述
LT3573 - Isolated Flyback Converter without an Opto-Coupler; Package: MSOP; Pins: 16; Temperature Range: -40°C to 85°C

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技术参数
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替代型号

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LT3573IMSE#TRPBF 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：	16	Reach Compliance Code：	compliant
ECCN代码：	EAR99	HTS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-G16	JESD-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 mm	Base Number Matches：	1

LT3573IMSE#TRPBF 数据手册

浏览型号LT3573IMSE#TRPBF的Datasheet PDF文件第10页

LT3511

operaTion

The LT3511 is a current mode switching regulator IC de-

signed specifically for the isolated flyback topology. The

keyprobleminisolatedtopologiesishowtocommunicate

informationregardingtheoutputvoltagefromtheisolated

secondary side of the transformer to the primary side.

Historically, optoisolators or extra transformer windings

communicate this information across the transformer.

Optoisolator circuits waste output power, and the extra

components increase the cost and physical size of the

power supply. Optoisolators can also exhibit trouble due

to limited dynamic response, nonlinearity, unit-to-unit

variation and aging over life. Circuits employing an extra

transformer winding also exhibit deficiencies. Using an

extra winding adds to the transformer’s physical size and

cost, and dynamic response is often mediocre.

VC pin controls the current level just as it does in normal

current mode operation, but instead of turning the switch

on at the start of the oscillator period, the part turns on the

switch 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

current increases until a VC pin controlled current limit.

After the switch turns off, the 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

. A discontinuous conduction

pin voltage falls below V

mode (DCM) comparator detects this event and turns the

switch back on.

In the LT3511, the primary-side flyback pulse provides

informationabouttheisolatedoutputvoltage. Inthisman-

ner, neither optoisolator nor extra transformer winding is

required for regulation. Two resistors program the output

voltage. Since this IC operates in boundary mode, the part

calculates output voltage from the switch pin when the

secondary current is almost zero.

Boundarymodereturnsthesecondarycurrenttozeroevery

cycle,soparasiticresistivevoltagedropsdonotcauseload

regulation errors. Boundary mode also allows the use of a

smaller transformer compared to continuous conduction

mode and does not exhibit subharmonic oscillation.

At low output currents, the LT3511 delays turning on the

switch, and thus operates in discontinuous mode. Unlike

traditional flyback converters, the switch has to turn on

to update the output voltage information. Below 0.6V on

the VC pin, the current comparator level decreases to

its minimum value, and the internal oscillator frequency

decreases. 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 flyback error amplifier. The typical minimum

internal oscillator frequency with VC equal to 0V is 40kHz.

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, os-

cillator, logic, current amplifier, current 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.

The LT3511 features boundary mode control, where the

part operates at the boundary between continuous con-

duction mode and discontinuous conduction mode. The

3511fa

1...4 5 678 9 10...26

中文翻译

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LT3573IMSE#TRPBF 替代型号

型号	品牌	替代类型	描述	数据表
LT3573IMSE#PBF	Linear	功能相似	LT3573 - Isolated Flyback Converter without an Opto-Coupler; Package: MSOP; Pins: 16; Temp

与LT3573IMSE#TRPBF相关器件

型号	品牌	获取价格	描述	数据表
LT3573IMSEPBF	Linear	获取价格	Isolated Flyback Converter without an Opto-Coupler
LT3573IMSE-PBF	Linear	获取价格	Isolated Flyback Converter Without an Opto-Coupler
LT3573IMSETRPBF	Linear	获取价格	Isolated Flyback Converter without an Opto-Coupler
LT3573IMSE-TRPBF	Linear	获取价格	Isolated Flyback Converter Without an Opto-Coupler
LT3574	Linear	获取价格	Isolated Flyback Converter Without an Opto-Coupler
LT3574	ADI	获取价格	无需使用光耦合器的隔离型反激式转换器
LT3574EMS	Linear	获取价格	Isolated Flyback Converter Without an Opto-Coupler
LT3574EMS#PBF	Linear	获取价格	LT3574 - Isolated Flyback Converter Without an Opto-Coupler; Package: MSOP; Pins: 16; Temp
LT3574EMS#TRPBF	Linear	获取价格	LT3574 - Isolated Flyback Converter Without an Opto-Coupler; Package: MSOP; Pins: 16; Temp
LT3574EMSPBF	Linear	获取价格	Isolated Flyback Converter Without an Opto-Coupler

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