LT1244 - High Speed Current Mode Pulse Width Modulators

The LT®1241 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.

  • 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
LT1244 Typical Application
  • Off-Line Converters
  • DC/DC Converters
LT1244 Package Drawing
Order Information 订购型号
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) *
CAD 符号
LT1241 Series - High Speed Current Mode Pulse Width Modulators
R293 Reliability Data
LT1244 Footprints and Symbols
LT1244 Demo Circuit - 300kHz Off-Line Power Supply (90-240VAC to 20V @ 1.5A)