KIA3842/3/4/5AP/AF
BIPOLAR LINEAR INTEGRATED CIRCUIT

HIGH PERFORMANCE CURRENT MODE CONTROLLER
The KIA3842/3/4/5AP/AF are high performance fixed frequency current mode controller. This is specifically designed for Off-Line and DC to DC converter applications offering the designer a cost effective solution with minimal external components. This integrated circuit feature a trimmed oscillator for precise duty cycle control, a temperature compensated reference, high gain error amplifier, current sensing comparator, and a high current totempole 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, programmable output deadtime, and a latch for single pulse metering. Differences between members of this family are the under-voltage lockout thresholds and maximum duty cycle ranges. The KIA3842A and K1A3844A have UVLO thresholds of 16V(on) and lOV(off), ideally suited off-line applications The corresponding thresholds for the KIA3843A and KIA3845A are 8.5V and 7.9V. The KIA3842A and K1A3843A can operate to duty cycles approaching 100%. A range of the zero to <50% is obtainedby the KIA3844A and KIA3845A by the addition of an internal toggle flip flop which balanks the output off every other clock cycle.