LT1425 Isolated Flyback Switching Regulators
The LT®1425 is a monolithic high power switching regulator specifically designed for the isolated flyback topology. No “third winding” or optoisolator is required; the integrated circuit senses the isolated output voltage directly from the primary side flyback waveform. A high current, high efficiency switch is included on the die along with all oscillator, control and protection circuitry. The LT1425 operates with input supply voltages from 3V to 20V and draws only 7mA quiescent current. It can deliver output power up to 6W with no external power devices. By utilizing current mode switching techniques, it provides excellent AC and DC line regulation. The LT1425 has a number of features not found on other switching regulator ICs. Its unique control circuitry can maintain regulation well into discontinuous mode in most applications. Optional load compensation circuitry allows for improved load regulation. An externally activated shutdown mode reduces total supply current to 15µA for standby operation
产品特点 Features
- No Transformer
- ±5% Accurate Output Voltage Without User Trims (See Circuit Below)
- Resistor Programmable Output Voltage
- Regulation Maintained Well Into Discontinuous Mode (Light Load)
- Optional Load Compensation
- Operating Frequency: 285kHz
- Easily Synchronized to External Clock
- Available in 16-Pin Narrow SO Package
参数
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应用
- Isolated Flyback Switching Regulators
- Ethernet Isolated 5V to -9V Converter
- Medical Instruments
- Isolated Telecom Supplies
典型应用图
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LT1425 订购信息和价格参考Package Variations and Pricing
| 器件型号 |
封装 |
引脚 |
温度 |
价格 (以 1 ~ 99 片为批量) |
价格 (以 1000 片为批量) * |
| LT1425CS |
SO |
16 |
C |
$3.55 |
$2.90 |
| LT1425CS#PBF |
SO |
16 |
C |
$3.55 |
$2.90 |
| LT1425CS#TR |
SO |
16 |
C |
|
$2.96 |
| LT1425CS#TRPBF |
SO |
16 |
C |
|
$2.96 |
| LT1425IS |
SO |
16 |
I |
$4.90 |
$3.95 |
| LT1425IS#PBF |
SO |
16 |
I |
$4.90 |
$3.95 |
| LT1425IS#TR |
SO |
16 |
I |
|
$4.01 |
| LT1425IS#TRPBF |
SO |
16 |
I |
|
$4.01 |
LT1425 数据手册及相关资料下载
- 数据手册(英文) : LT1425 - Isolated Flyback Switching Regulators.PDF
- 应用指南 (英文) : AN84 - linear Technology Magazine Circuit Collection, Volume IV .PDF
- 设计要点 (英文) : DN158 - Isolated DC/DC Conversion with the LT1425.PDF
- 可靠性数据 : R387 Reliability Data .PDF
