High Performance Current Mode Controllers
●The UC3844B, UC3845B series are high performance fixed frequency current mode controllers. They are specifically designed for Off−Line and dc−dc converter applications offering the designer a cost−effective solution with minimal external components. These integrated circuits feature an oscillator, a temperaturecompensated reference, high gain error amplifier, current sensing comparator, and a high current totem pole output ideally suited for driving a power MOSFET.
●Features
●•Trimmed Oscillator for Precise Frequency Control
●•Oscillator Frequency Guaranteed at 250 kHz
●•Current Mode Operation to 500 kHz Output Switching Frequency
●•Output Deadtime Adjustable from 50% to 70%
●•Automatic Feed Forward Compensation
●•Latching PWM for Cycle−By−Cycle Current Limiting
●•Internally Trimmed Reference with Undervoltage Lockout
●•High Current Totem Pole Output
●•Undervoltage Lockout with Hysteresis
●•Low Startup and Operating Current
●•These Devices are Pb−Free and are RoHS Compliant
●•NCV Prefix for Automotive and Other Applications Requiring Unique Site and Control Change Requirements; AEC−Q100
●Qualified and PPAP Capable
