UC2845BD1G

ON SEMICONDUCTOR  UC2845BD1G  控制器, PWM, 25V-12V电源, 250 kHz, 13.4V/12mA输出, SOIC-8

The is a high-performance fixed frequency current-mode Pulse Width Modulation PWM Controller specifically designed for off-line and DC to DC converter applications offering the designer a cost-effective solution with minimal external components. It features 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. Also included are protective features consisting of input and reference undervoltage lockouts each with hysteresis, cycle-by-cycle current limiting, a latch for single pulse metering and a flip-flop which blanks the output off every other oscillator cycle, allowing output deadtimes to be programmed from 50 to 70%.

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Trimmed oscillator for precise frequency control

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Automatic feed forward compensation

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Internally trimmed reference with undervoltage lockout

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High current totem pole output

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Undervoltage lockout with hysteresis

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Low startup and operating current