SG3524D

Overview

The SG3524D is a voltage-mode PWM controller manufactured by Texas Instruments, designed for regulating power supplies and switching regulators. It supports multiple topologies including Boost, Buck, Flyback, Forward, Full Bridge, Half Bridge, and Push-Pull configurations. The device features dual alternating outputs capable of driving single-ended or push-pull applications. Key electrical parameters include a maximum switching frequency of 450 kHz, a maximum duty cycle of 45%, and an output current capability of 50 mA. The internal reference voltage ranges from 4.6 V to 5.4 V. It operates within a supply voltage range of 8 V to 40 V and functions across a temperature range of 0°C to +70°C. The component is housed in a 16-SOIC surface-mount package.

Feature Summary

• Integrates complete PWM power control circuitry on a single monolithic chip, including an on-chip reference, error amplifier, programmable oscillator, and pulse-steering flip-flop.
• Features dual uncommitted output transistors that allow flexible configuration for either single-ended or push-pull applications.
• Includes dedicated current-limiting and shut-down circuitry to protect the system during fault conditions.

Applications

• Regulating power supplies
• Transformer-coupled DC-to-DC converters
• Switching regulators employing fixed-frequency pulse-width modulation

Procurement Notes

Verify the specific suffix 'D' indicates the SOIC-16 surface-mount package variant when ordering. Confirm RoHS compliance status as required by project specifications. Ensure the operating temperature range aligns with the commercial grade (0°C to +70°C) rather than extended industrial variants. Cross-reference pinout diagrams with the official datasheet to ensure compatibility with existing PCB footprints before finalizing procurement.

Selection Notes

Select this component for designs requiring a versatile voltage-mode controller supporting multiple converter topologies. The dual-output architecture is suitable for push-pull or half-bridge applications. Consider the 450 kHz maximum switching frequency for balancing efficiency and size. Verify that the 45% maximum duty cycle meets the input/output voltage requirements of the target application without exceeding limits.

Part Context

The SG3524 belongs to the SG3524 family of advanced regulating pulse width modulators. This series is designed for high-power-output applications and transformerless voltage doublers. The SG3524D specifically denotes the commercial grade version in a surface-mount package, offering a cost-effective solution for general-purpose power management compared to military-grade equivalents like the UC3524.

Replacement Considerations

The LM3524 is a direct functional replacement within the same product family, offering similar control features but with an extended temperature range up to 125°C. Other compatible alternatives include the UC3524 for military-grade requirements. Verify pin compatibility and thermal characteristics when substituting.