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LT1245 - 典型应用图例：
LT1245典型应用图例一
LT1245 - 封装图解：
LT1245封装图解一
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LINEAR产品 - LT1245介绍

LT1245 - LT1245是High Speed Current Mode Pulse Width Modulators

LT1245是LINEAR凌力尔特公司的一款PWM 控制器产品，LT1245是LT1245是High Speed Current Mode Pulse Width Modulators，本站介绍了LT1245的封装应用图解、特点和优点、功能等，并给出了与LT1245相关的LINEAR元器件型号供参考。

LT1245 - LT1245是High Speed Current Mode Pulse Width Modulators - PWM 控制器 - 电源管理 - 凌力尔特

LT1245 - High Speed Current Mode Pulse Width Modulators

LT1245 - High Speed Current Mode Pulse Width Modulators - Linear Technology（凌力尔特）

功能描述
The LT1241 series devices are 8-pin, fixed frequency, current mode, pulse width modulators. They are improved plug compatible versions of the industry standard UC1842 series. These devices have both improved speed and lower quiescent current. The LT1241 series is optimized for off-line and DC/DC converter applications. They contain a temperature-compensated reference, high gain error amplifier, current sensing comparator and a high current totem pole output stage ideally suited to driving power MOSFETs. Start-up current has been reduced to less than 250µA. Cross-conduction current spikes in the output stage have been eliminated, making 500kHz operation practical. Several new features have been incorporated. Leading edge blanking has been added to the current sense comparator. Trims have been added to the oscillator circuit for both frequency and sink current, and both of these parameters are tightly specified. The output stage is clamped to a maximum VOUT of 18V in the on state. The output and the reference output are actively pulled low during undervoltage lockout.
特点
  • Low Start-Up Current: <250µA
  • 50ns Current Sense Delay
  • Current Mode Operation: To 500kHz
  • Pin Compatible with UC1842 Series
  • Undervoltage Lockout with Hysteresis
  • No Cross-Conduction Current
  • Trimmed Bandgap Reference
  • 1A Totem Pole Output
  • Trimmed Oscillator Frequency and Sink Current
  • Active Pull-Down on Reference and Output During Undervoltage Lockout
  • High Level Output Clamp: 18V
  • Current Sense Leading Edge Blanking
    • 应用
  • Off-Line Converters
  • DC/DC Converters
    • 以下列出了不同封装及包装形式的具体型号,并标出了直接在linear官网上订货的价格（美元）
    器件型号 封装 温度 价格 (以 1 ~ 99 片为批量) 价格 (以 1000 片为批量)
    LT1245CN8 N-8 C $2.33 $1.95
    LT1245CN8#PBF N-8 C $2.33 $1.95
    LT1245CS8 SO-8 C $2.58 $2.20
    LT1245CS8#PBF SO-8 C $2.58 $2.20
    LT1245CS8#TR SO-8 C $2.26
    LT1245CS8#TRPBF SO-8 C $2.26
    LT1245IN8 N-8 I $2.58 $2.20
    LT1245IN8#PBF N-8 I $2.58 $2.20
    LT1245IS8 SO-8 I $2.83 $2.40
    LT1245IS8#PBF SO-8 I $2.83 $2.40
    LT1245IS8#TR SO-8 I $2.46
    LT1245IS8#TRPBF SO-8 I $2.46
    下面可能是您感兴趣的Linear Technology（凌力尔特）元器件
  • LT1247 - 1MHz Off-Line Current Mode PWM and DC/DC Converter
  • LT1241 - 高速电流模式脉宽调制器
  • LTC6992-1 / LTC6992-2 / LTC6992-3 / LTC6992-4 - TimerBlox : 电压控制型脉宽调制器 (PWM)
  • LT1243 - High Speed Current Mode Pulse Width Modulators
  • LT3080 - 可调 1.1A、单电阻、低压差稳压器
  • LT4320 / LT4320-1 - 理想二极管桥控制器
  • LT1244 - High Speed Current Mode Pulse Width Modulators
  • LT3758 - 高输入电压、升压、反激式、SEPIC 和负输出控制器
  • LT3796 - 具双电流检测的 100V 恒定电流和恒定电压控制器
  • LTC4441 - N 沟道 MOSFET 栅极驱动器
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