UC3845BD1R2G

The UC3845BD1R2G is a high-performance, fixed-frequency, current-mode pulse-width modulation (PWM) controller specifically designed for offline and DC-DC converter applications. Manufactured by ON Semiconductor (formerly known as ONSemi), this integrated circuit (IC) provides a cost-effective solution with minimal external components required.

Key features of the UC3845BD1R2G include:

1. Oscillator and Frequency Control: It features a trimmable oscillator that guarantees an operating frequency of 250 kHz, with an output switching frequency that can reach up to 500 kHz. This allows for precise frequency control in power supply designs.
2. Current-Mode Control: The UC3845BD1R2G operates in current-mode, which provides faster transient response and better stability compared to voltage-mode controllers.
3. Protection Features: The IC incorporates protection features such as input and reference undervoltage lockout (UVLO) with hysteresis, cycle-by-cycle current limiting, a latch for single-pulse measurement, and a flip-flop that blanks the output every other oscillator cycle. This allows for programmable output dead-time from 50% to 70%, enhancing system reliability.
4. High-Current Totem-Pole Output: The UC3845BD1R2G is equipped with a high-current totem-pole output stage, making it suitable for driving power MOSFETs in switching applications.
5. Low Startup and Operating Current: The device features low startup and operating currents, which contribute to reduced power consumption in the overall system.
6. Compliance and Packaging: The UC3845BD1R2G is compliant with RoHS standards, ensuring environmental friendliness. It is available in an 8-pin SOIC (small outline integrated circuit) package for surface-mount installation, as well as a 14-pin SOIC package with separate power and ground pins for the totem-pole output stage.

Applications of the UC3845BD1R2G include, but are not limited to, switching power supplies, battery chargers, inverters, and motor drives. Its ability to provide stable power output, combined with protection features such as overload and short-circuit protection, makes it a versatile and reliable choice for a wide range of power management applications.

Overall, the UC3845BD1R2G is a highly integrated, cost-effective PWM controller that offers a combination of performance, reliability, and ease of use, making it an ideal choice for designers of offline and DC-DC converter circuits.