ON Semiconductor UC3845BDG High-Performance Current Mode PWM Controller

The UC3845BDG is a versatile and robust current mode pulse width modulation (PWM) controller manufactured by ON Semiconductor. It is designed to offer a high level of performance in power supply applications, providing efficient and reliable solutions for a wide range of systems. With its advanced features and flexibility, the UC3845BDG is ideal for use in switch-mode power supplies (SMPS), DC-DC converters, and other power conversion applications.

This PWM controller operates at a fixed frequency that is programmable, allowing for precise control over the power supply's operation. It features a wide input voltage range, making it suitable for applications that require operation from various input sources. The UC3845BDG also boasts an impressive array of protective features, including under-voltage lockout (UVLO), over-current protection, and a latch for single pulse metering, which ensures the safety and longevity of the power system it controls.

The device's high current totem-pole output is capable of driving a power MOSFET or IGBT directly, which simplifies the design and reduces component count. Its current mode operation provides excellent transient response and simplifies loop compensation. The UC3845BDG also has an automatic feed-forward compensation feature, which improves the response to large input voltage variations.

ON Semiconductor has designed the UC3845BDG with a range of performance-enhancing features, such as leading-edge blanking of the current sense input, which helps to eliminate noise problems associated with the sharp edges of PWM waveforms. The oscillator frequency can be programmed with a single external resistor and capacitor, and the device also includes an internal trim oscillator for precise frequency control.

Available in a 14-pin SOIC package, the UC3845BDG is not only powerful but also compact, making it a convenient choice for space-constrained applications. With its combination of performance, reliability, and ease of use, the UC3845BDG from ON Semiconductor is an excellent choice for designers looking to create efficient and effective power management solutions.