UC3843BD1G

The UC3843BD1G from onsemi is a fixed-frequency, current mode controller designed for efficient Off-Line and DC-DC converter applications. It offers a cost-effective solution requiring minimal external components. Key features include a trimmed oscillator for precise frequency control, guaranteed at 250 kHz, and capable of current mode operation up to 500 kHz. The device includes a temperature-compensated reference, a high-gain error amplifier, and a current sensing comparator.

Protective features are integrated, such as input and reference undervoltage lockouts with hysteresis, cycle-by-cycle current limiting, and programmable output deadtime. The UC3843B variant is tailored for lower voltage applications, featuring UVLO thresholds of 8.5 V (on) and 7.6 V (off). The high current totem pole output is ideal for driving power MOSFETs. This device is available in an 8-pin dual-in-line and surface mount (SOIC-8) plastic package, as well as a 14-pin plastic surface mount (SOIC-14) package. The SOIC-14 package provides separate power and ground pins for the totem pole output stage.

This controller is Pb-Free and Halide-Free. It is suitable for applications requiring precise control over switching frequency and current limiting, making it a versatile component for power supply designs.