The UC3844B, UC3845B series are high performance fixed frequency current mode controllers. They are specifically designed for OffâLine and dcâdc converter applications offering the designer a costâeffective solution with minimal external components. These integrated circuits feature an oscillator, a temperature compensated 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 CycleâByâCycle 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 PbâFree and are RoHS Compliant
⢠NCV Prefix for Automotive and Other Applications Requiring Unique Site and Control Change Requirements; AECâQ100 Qualified and PPAP Capable
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