The UC3842BNG from ON Semiconductor is a high-performance, fixed-frequency current mode PWM controller. It is widely used in off-line and DC-to-DC converter applications due to its robust feature set and flexibility. This integrated circuit is designed to deliver efficient power management and is housed in an 8-pin DIP package, making it suitable for a wide range of power supply designs.

Key Features

• Trimmed Oscillator: The onboard oscillator is precision-trimmed for accurate frequency control. It has a guaranteed frequency stability of +/-1% over temperature, voltage, and power supply variations.
• Current Mode Operation: The UC3842BNG provides improved transient response and simplified loop compensation when compared to voltage mode PWMs.
• Automatic Feed Forward Compensation: This feature enhances the performance by compensating for varying input voltages without the need for external components.
• Pulse-by-Pulse Current Limiting: The controller offers inherent protection against short-circuit conditions by limiting the peak current in each cycle.
• Under-Voltage Lockout: With hysteresis, the under-voltage lockout ensures that the controller is off unless there is a sufficient supply voltage.

Applications

• Switching power supplies
• Power converters
• Battery chargers
• DC-DC modules
• LED drivers

ON Semiconductor's UC3842BNG is engineered for performance and reliability. It operates at a frequency up to 500kHz and features a low start-up current of less than 0.5mA. This PWM controller is also characterized by a 1A peak output current capability and an optimized gate drive designed to drive a power MOSFET or IGBT directly. The UC3842BNG is a versatile choice for engineers looking to design efficient power supply solutions across a range of applications.

With its combination of features and performance, the UC3842BNG stands out as a top choice in its class, providing designers with a reliable and cost-effective solution for their power management needs.