SG1526J

Overview

The SG1526J is a high-performance monolithic pulse width modulator circuit designed for fixed-frequency switching regulators and other power control applications. It operates within an 8 to 35 volt supply range and features a temperature-compensated voltage reference trimmed to ±1%. The device includes a sawtooth oscillator with a frequency range of 1 Hz to 350 kHz, an error amplifier, and digital current limiting logic. It provides dual 100 mA source/sink outputs capable of driving external power transistors directly. Packaged in a 18-pin ceramic dual-in-line (CDIP) format, it supports through-hole mounting.

Feature Summary

• Integrated temperature-compensated voltage reference with precise trimming
• Dual low-impedance power drivers for direct transistor control
• Built-in digital current limiting and pulse steering logic
• Fixed-frequency operation with adjustable oscillator timing

Applications

• Fixed-frequency DC-to-DC switching regulators
• High-reliability isolated switching power supplies
• Motor control systems requiring PWM modulation
• Industrial power management circuits

Procurement Notes

Verify the specific manufacturer designation and package material when sourcing, as historical data indicates production by multiple entities including Motorola and Microchip. Confirm RoHS compliance status and lead times directly with authorized distributors or the manufacturer, as availability varies. Ensure the CDIP-18 ceramic package matches the thermal and mechanical requirements of the target design before finalizing procurement.

Selection Notes

Select this component for designs requiring robust isolation and high-reliability performance in industrial environments. The dual output configuration simplifies push-pull or half-bridge topologies without additional driver stages. Consider the 350 kHz maximum switching frequency when designing magnetic components. Verify that the 100 mA output current meets the gate drive requirements of the selected power MOSFETs or IGBTs.

Part Context

The SG1526 series belongs to a family of high-reliability switching controllers originally developed for military and aerospace applications. The 'J' suffix typically denotes a ceramic dual-in-line package variant suitable for harsh environments. This part serves as a foundational PWM controller for legacy and modern power supply designs requiring precise regulation and protection features.

Replacement Considerations

Compatible substitutes include the SG3526 series for similar functionality in plastic packages. Cross-reference with LM3524 variants for equivalent electrical characteristics in standard commercial packaging. Verify pin compatibility and thermal performance when transitioning between manufacturers or package types.

FAQ

What is the maximum switching frequency supported by the SG1526J?

The internal oscillator supports frequencies ranging from 1 Hz up to 350 kHz.

Does the SG1526J include built-in protection features?

Yes, it incorporates digital current limiting and shutdown capabilities for overcurrent protection.