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UC3845BNG

The UC3845BNG is a high-performance, fixed-frequency, current-mode PWM controller designed for offline switch-mode power supply applications. It is manufactured by ON Semiconductor, a leading global supplier of semiconductor solutions.

Description:

The UC3845BNG is a monolithic integrated circuit that provides all the necessary features for a high-efficiency power supply. It operates in current-mode control, which offers excellent line and load regulation, fast transient response, and ease of loop compensation. The device is available in a narrow SO-8 package, making it suitable for compact and cost-effective designs.

Features:

1. Fixed 50kHz switching frequency, suitable for universal input applications.
2. Current-mode control for excellent line and load regulation and fast transient response.
3. High-voltage startup with under-voltage lockout (UVLO) protection.
4. Over-current protection (OCP) and over-temperature protection (OTP) for enhanced reliability.
5. Soft-start feature to reduce inrush current and minimize output capacitor requirements.
6. Push-pull output stage with individual high and low-side drive signals.
7. External compensation pins for easy loop stabilization.
8. Synchronous rectification control for improved efficiency during light load conditions.
9. Low standby power consumption.
10. Protection against shoot-through conditions.

Applications:

The UC3845BNG is suitable for a wide range of power supply applications, including but not limited to:

1. Offline switch-mode power supplies (SMPS) for AC-DC conversion.
2. Power factor correction (PFC) circuits.
3. Battery chargers for various chemistries, such as lithium-ion, lead-acid, and nickel-based batteries.
4. LED lighting applications, including LED drivers and controllers.
5. Industrial control and automation systems.
6. Telecommunications equipment power supplies.
7. Computer and server power supplies.

The UC3845BNG's combination of high performance, fixed-frequency operation, and comprehensive protection features make it an ideal choice for designers looking to implement efficient and reliable power supply solutions in various applications.