SG3525AN

The SG3525AN is a versatile pulse width modulator (PWM) integrated circuit (IC) designed for use in various types of switching power supplies. It offers a combination of features that make it an ideal choice for power management applications, including high efficiency, low external component count, and robust performance.

Key Features:

1. Voltage Range: The SG3525AN operates within a wide voltage range of 8V to 35V, making it suitable for use with a variety of power sources.
2. Reference Voltage: The on-chip reference voltage is trimmed to ±1% and set at 5.1V. This eliminates the need for external resistors and simplifies the design process.
3. Oscillator Range: The IC features an oscillator range of 100Hz to 500kHz (or 400kHz, depending on specific datasheets), allowing for flexible switching frequencies to suit different applications.
4. Sync Input: A sync input to the oscillator allows multiple units to be slaved together or a single unit to be synchronized to an external system clock.
5. Adjustable Deadtime Control: A single resistor between the CT and discharge terminals provides a wide range of dead-time adjustment, enabling precise control over the PWM waveform.
6. Soft-Start Circuitry: Built-in soft-start circuitry requires only an external timing capacitor, simplifying the power-up sequence and reducing stress on the power supply components.
7. Shutdown Pin: A shutdown pin controls both the soft-start circuitry and the output stages, providing instantaneous turn-off through the PWM latch with pulsed shutdown. This also allows for soft-start recycle with longer shutdown commands.
8. Undervoltage Lockout: The undervoltage lockout feature inhibits the outputs and keeps the soft-start capacitor discharged for sub-normal input voltages, ensuring safe operation.
9. Output Stages: The output stages are totem-pole designs capable of sourcing or sinking in excess of 200mA. They feature NOR logic, resulting in a low output for an off-state.
10. Package Type: The SG3525AN is typically packaged in a plastic DIP-16 package, making it suitable for integration into a variety of applications.

Applications:

The SG3525AN is ideal for use in a wide range of power management applications, including:

• Switching power supplies
• DC-DC converters
• UPS systems
• Battery chargers
• Motor control circuits

In summary, the SG3525AN is a high-performance PWM IC that offers a combination of features that make it an excellent choice for power management applications. Its wide voltage range, adjustable oscillator, soft-start circuitry, and undervoltage lockout provide robust and reliable performance, while its compact DIP-16 package makes it easy to integrate into various systems.