UC3843BNG Current Mode PWM Controller 1A 500kHz 8-Pin PDIP Tube

The UC3842B，UC3843B series are high performance fixedfrequency current mode controllers. They are specifically designed forOff-Line and DC-DC converter applications offering the designer acost-effective solution with minimal external components. 

Theseintegrated circuits feature a trimmed oscillator for precise duty cyclecontrol, a temperature compensated reference, high gain erroramplifier, current sensing comparator, and a high current totem poleoutput ideally suited for driving a power MOSFET.

Also included are protective features consisting 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 pins for the totem pole output stage.

The uCX842B has uvLO thresholds of 16 V (on) and 10 V (off).ideally suited for off-line converters. The UCX843B is tailored forlower voltage applications having UVLO thresholds of 8.5 V (on) and7.6 V (off)