SG3524BN

Overview

The SG3524BN is a monolithic pulse width modulator designed for regulating power supplies, inverters, and switching regulators. It integrates an on-chip reference, error amplifier, programmable oscillator, pulse-steering flip-flop, two uncommitted output transistors, a high-gain comparator, and current-limiting circuitry. The device supports fixed-frequency operation up to 300 kHz with a typical standby current of 8 mA. It features dual alternating outputs suitable for single-ended or push-pull applications and offers a maximum temperature variation of the reference voltage at 1%.

Feature Summary

• Integrates complete PWM power control circuitry on a single monolithic chip
• Provides dual alternating outputs configurable for single-ended or push-pull topologies
• Includes built-in current-limiting and shut-down protection circuitry

Applications

• Transformer-coupled DC-to-DC converters
• Transformerless voltage doublers
• Polarity converter applications
• High power-output switching regulators

Procurement Notes

Verify the specific manufacturer source, as the SG3524 family has been produced by multiple vendors including Microchip Technology and STMicroelectronics. Confirm that the SG3524BN designation corresponds to the intended performance specifications and pinout compatibility. Check for any obsolete status notifications from the supplier, as some variants may no longer be actively manufactured. Ensure the package type matches the required PCB footprint before finalizing procurement orders.

Selection Notes

Select this component for designs requiring a versatile PWM controller capable of driving both single-ended and push-pull configurations. The integrated programmable oscillator and error amplifier simplify the design of transformer-coupled converters. Consider the 300 kHz maximum operating frequency when determining transformer size and switching losses. The low standby current makes it suitable for applications where efficiency in idle states is a priority.

Part Context

The SG3524BN belongs to the SG3524 family of voltage mode PWM controllers. This family was originally designed for high-reliability applications and is widely used in industrial and commercial power supply designs. The BN suffix typically indicates a specific package variant, often a plastic DIP, within the broader SG3524 product line which includes various temperature grades and packaging options.

Replacement Considerations

Public confirmed substitute part numbers are not available in the provided documentation. Users should consult official manufacturer cross-reference guides for compatible alternatives such as the SG3524N or other industry-standard PWM controllers with equivalent pinouts and electrical characteristics.