The UC2844J is a current-mode PWM (Pulse Width Modulation) controller manufactured by Rochester Electronics. This controller is specifically designed for off-line and DC-to-DC converter applications, providing the necessary functions to implement power control schemes. Its features make it suitable for a wide range of power supply designs.

Applications

• Switch-mode power supplies
• DC-DC converters
• Off-line power converters
• Battery chargers
• Uninterruptible power supplies (UPS)

Features

• Optimized for off-line and DC-to-DC converters
• Low start-up current
• Automatic feed forward compensation
• Latching PWM for cycle-by-cycle current limiting
• Double-pulse suppression
• Internally trimmed reference with UVLO (Under-Voltage Lockout)

Benefits

• Enables efficient and reliable power conversion.
• Reduces power consumption with low start-up current.
• Provides stable operation with feed forward compensation.
• Protects the power supply with cycle-by-cycle current limiting and double-pulse suppression.
• Ensures proper operation with internally trimmed reference and UVLO.

Additional Details

The UC2844J operates with a supply voltage range of 10V to 30V. It features a maximum duty cycle of less than 50%. The switching frequency is typically up to 500 kHz. The UVLO threshold is typically 7V. It is available in a ceramic DIP package. This PWM controller is a cost-effective and robust solution for various power supply applications.