The Texas Instruments 3845B represents a pinnacle of innovation in the field of power management integrated circuits. This high-performance pulse-width modulation (PWM) controller is designed for a wide array of applications, particularly in switched-mode power supplies. With its precision voltage reference and an oscillator that is adjustable over a wide range, the 3845B stands out for its versatility and reliability.
Key Features
- Adjustable Oscillator: The oscillator frequency can be programmed to suit various application needs, providing flexibility in design.
- High Current Totem Pole Output: Designed to drive the gate of a power MOSFET, it ensures efficient power conversion and minimizes switching losses.
- Under-Voltage Lockout (UVLO): This critical feature ensures that the device only operates when the supply voltage is within an acceptable range, protecting the circuit from low-voltage conditions.
- Voltage Feedforward Compensation: This allows for enhanced response to input voltage variations, ensuring stable output despite fluctuations in the power supply.
- Precision Reference: A 5V ±1% trimmed reference voltage allows for accurate and consistent power regulation.
Applications
The 3845B is suitable for a variety of applications, including:
- DC to DC Converters
- AC to DC Power Supplies
- Off-Line Power Supplies
- Switching Regulators
Technical Specifications
Parameter
Value
Output Drive Capability
200mA
Reference Voltage
5V ±1%
Oscillator Frequency Range
Adjustable
UVLO Threshold
Specified by Manufacturer
For designers seeking a robust and flexible solution for their power supply requirements, the Texas Instruments 3845B PWM controller is an excellent choice that combines performance with ease of use.
