ON Semiconductor UC3845BVN High Performance Current Mode Controller

The ON Semiconductor UC3845BVN is a high-performance current mode pulse width modulator (PWM) controller that provides user-friendly features to facilitate robust and efficient power supply designs. It is particularly suitable for off-line and DC-to-DC converter applications that require precise current control and protection.

Key Features:

• High Current Totem Pole Output: The UC3845BVN is designed with a totem pole output capable of swinging 500mA and 1.5A in the sink mode, which is ideal for driving a power MOSFET or IGBT directly.
• Trimmed Oscillator Discharge Current: The internal oscillator's discharge current is trimmed, ensuring consistent and reliable operation of the PWM, with a frequency range up to 500kHz.
• Current Mode Operation: Current mode control provides inherent line feed-forward, cycle-by-cycle current limiting, and ease of loop compensation.
• Automatic Feed Forward Compensation: This feature helps in maintaining stable operation under varying input voltage conditions.
• Pulse-by-Pulse Current Limiting: Enhanced protection is provided through an internal circuitry that limits the current pulse-by-pulse, preventing damage to the controller in over-current conditions.
• Under-Voltage Lockout: With hysteresis, the UC3845BVN ensures the controller is off when the supply voltage is too low, preventing erratic operation.

Product Applications:

The UC3845BVN is versatile and can be used in a variety of applications, including:

• Switching power supplies
• Power converters
• Motor controllers
• Battery chargers
• LED drivers
• Power factor correction modules

With its robust design and comprehensive features, the UC3845BVN from ON Semiconductor is an excellent choice for designers looking to implement a reliable and high-performance power management solution in their products. Its ability to handle high current outputs and offer precise current control makes it a go-to component for a wide range of power applications.