品牌on semi型号uc3843bng 封装pdip-8批号1055 类型其他ic

the uc3842b, uc3843b series are high performance fixedfrequency current mode controlle. they are specifically designed foroff−line and dc−dc converter applicatio offering the designer acost−effective solution with minimal external components. theseintegrated circuits feature a trimmed oscillator for precise duty cyclecontrol, a temperature compeated reference, high gain erroramplifier, current seing comparator, and a high current totem poleoutput ideally suited for driving a power mosfet.also included are protective features coisting of input andreference undervoltage lockouts each with hysteresis, cycle−by−cyclecurrent limiting, programmable output deadtime, and a latch for singlepulse metering.these devices are available in an 8−pin dual−in−line and surfacemount (soic−8) plastic package as well as the 14−pin plastic surfacemount (soic−14). the soic−14 package has separate power andground pi for the totem pole output stage.the ucx842b has uvlo thresholds of 16 v (on) and 10 v (off),ideally suited for off−line converte. the ucx843b is tailored forlower voltage applicatio having uvlo thresholds of 8.5 v (on) and7.6 v (off).features• trimmed oscillator for precise frequency control• oscillator frequency guaranteed at 250 khz• current mode operation to 500 khz• automatic feed forward compeation• 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• this is a pb−free and halide−free device