LT1241CN8#PBF

FEATURES
■Low Start-Up Current:<250uA
■50ns Current Sense Delay
■Current Mode Operation:To 500kHz
■Pin Compatible with UC1842 Series Undervoltage Lockout with Hysteresis
■No Cross-Conduction Current Timmed Bandgap Reference
■1A Totem Pole Output Timmed Oscillator Frequency and Sink Current
■Active Pull-Down on Reference and Output During Undervoltage Lockout aHigh Level Output Clamp:18V Curent Sense Leading Edge Blanking

APPLICATIOnS
a0ff-Line Converters
■DC/DC Converters

DESCRIPTIOn

 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 LT1241CN8 series is optimized for off-line and DC/DC converter applications.

 They con-tain a temperature-compensated reference, high gain error amplifier, current sensing comparator and a high current totem pole output stage ideally suited to driv-ing power MOSFETs. Start-up current has been reduced to less than 250uA. Cross-conduction current spikes in the output stage have been eliminated, making 500kHz operation practical. Several new features have been incor-porated. 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 out-put stage is clamped to a maximum Vour of 18V in the on state. The output and the reference output are actively pulled low during undervoltage lockout.

Feature

Applications

(Picture:Pinout / Diagram)