ON Semiconductor SG3525ANG Pulse Width Modulator

The SG3525ANG, manufactured by ON Semiconductor, is a versatile and high-performance pulse width modulator (PWM) integrated circuit designed for a wide range of power supply and motor control applications. This IC is engineered to provide the necessary features to implement off-line or DC-to-DC fixed-frequency current-mode control schemes with minimal external components.

Key Features:

• Adjustable Output: The SG3525ANG offers an adjustable output pulse width, enabling precise control over the power delivered to the load. This feature ensures efficient operation and power management across various conditions.
• Wide Operating Range: With an operating range from 8 V to 35 V, this PWM controller can accommodate a broad spectrum of power supplies, ensuring versatility in its application.
• Dual Output: The device features complementary outputs with a maximum duty cycle clamped at 90% to prevent transformer core saturation and ensure reliable operation.
• Frequency Adjustability: The oscillator frequency is user-adjustable, allowing customization for different applications. This flexibility is critical for optimizing system performance.
• Soft-Start Function: A built-in soft-start function limits the inrush current at startup, enhancing system reliability and extending component lifespan.
• Under-Voltage Lockout: The under-voltage lockout (UVLO) feature ensures that the PWM controller operates only when the supply voltage is within an acceptable range, thus protecting the circuitry.
• Shutdown Capability: The SG3525ANG offers a shutdown pin that can be used to turn off the output drivers and put the IC in a low-power state, which is crucial for power-saving strategies.

Applications:

The SG3525ANG is suitable for a variety of applications, including:

• Switching power supplies
• DC-DC converters
• Motor control systems
• Class D switching amplifiers
• Inverters and UPS systems

With its robust design and comprehensive feature set, the ON Semiconductor SG3525ANG is an ideal solution for designers looking to implement efficient and reliable PWM control in their power management systems. Its industry-standard pinout and package make it easy to integrate into existing designs, simplifying the development process and reducing time to market.