The UC3845B is a current-mode PWM (Pulse Width Modulation) controller from Texas Instruments, designed for switch-mode power supplies (SMPS). It provides the necessary control for regulating the output voltage and current in a variety of power conversion applications, offering high efficiency and stability in DC-DC and AC-DC designs.

UC3845AN Datasheet PDF

Key Features:

• Current-Mode Control: The UC3845B operates with current-mode feedback, providing improved control over the output voltage and current, which enhances system stability and response time.
• Wide Supply Voltage: The device operates with a supply voltage range of 8V to 40V, making it suitable for a variety of power supplies.
• Low Start-Up Current: Requires a low start-up current of 2.5mA, which helps reduce the overall system power consumption during operation.
• Precision Timing: Includes an accurate internal oscillator to generate the switching frequency, which can be adjusted externally with a resistor and capacitor.
• Built-In Protection: Features over-voltage protection (OVP), over-current protection (OCP), and soft start to ensure the power supply operates reliably under varying conditions.
• Compact Package: Available in a DIP-8 or SO-8 package, making it suitable for a variety of space-constrained designs.

Applications:

• DC-DC Converters: Used in designing buck, boost, or buck-boost converters for power regulation in embedded systems, portable devices, and industrial equipment.
• Power Supplies: Common in AC-DC adapters, battery chargers, and power bricks, where precise voltage regulation and efficiency are required.
• Telecommunications: Used in telecom equipment to provide stable power for communication devices and systems.
• Industrial Electronics: Ideal for controlling power supplies in automation systems, sensors, and industrial control circuits.

The UC3845B is an efficient and versatile PWM controller that provides the performance necessary for reliable power conversion in a wide range of applications, offering robust control and protection features for safe and stable operation. resistor color code 

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