BD7679G-GTR

Overview

The BD7679G-GTR is a PWM controller type DC/DC converter IC designed for AC/DC applications. It supports both insulated and non-insulated topologies, enabling flexible power supply designs using external switching MOSFETs and current detection resistors. The device operates with a fixed switching frequency of 65 kHz and incorporates a built-in frequency hopping function to reduce electromagnetic interference (EMI). Key electrical parameters include a minimum input voltage of 8.5 V, a maximum input voltage of 25 V, and a maximum switching frequency of 65 kHz. It features soft start, per-cycle overcurrent protection, VCC overvoltage protection, and thermal shutdown with auto-restart capabilities.

Feature Summary

• Supports both insulated and non-insulated AC/DC converter designs with external MOSFET integration
• Incorporates peak current control mode for superior bandwidth and transient response performance
• Includes built-in frequency hopping functionality to assist in achieving low EMI emissions
• Provides comprehensive protection mechanisms including per-cycle overcurrent limit and VCC overvoltage protection

Applications

• Low-power AC/DC converters for consumer electronics with plug-in interfaces
• Insulated power supply systems requiring compact design
• Non-insulated DC/DC conversion architectures
• Applications necessitating low electromagnetic interference through frequency spreading

Procurement Notes

Verify the specific suffix GTR indicates tape and reel packaging when ordering. Confirm that the component is classified as standard grade and explicitly not recommended for automotive equipment. Ensure the operating temperature range meets system requirements, as this variant is rated for -40°C to 85°C. Cross-reference the RoHS compliance status with the latest manufacturer documentation before finalizing procurement specifications.

Selection Notes

Select this IC for designs requiring a fixed 65 kHz switching frequency with current mode control. It is suitable for applications needing external MOSFETs for higher flexibility rather than integrated switches. Consider the 250ns leading-edge blanking time for noise immunity. Evaluate the need for external stop functionality via the COMP terminal if system-level shutdown or latch-off protection is required for thermal or output overvoltage conditions.

Part Context

This component belongs to ROHM's AC/DC converter IC series focused on high efficiency and miniaturization. It utilizes PWM quasi-resonant or fixed frequency control methods to reduce light load consumption. The series emphasizes built-in protection circuits and low-noise features, targeting general-purpose power supplies where external power switches allow for customized voltage and current ratings beyond integrated solutions.

Replacement Considerations

The BD7673AG-GTR is a confirmed substitute within the same family. Both share identical pinouts, SSOP6 packages, and core functional specifications including the 65 kHz switching frequency and protection features. Differences may exist in thermal shutdown behavior, with BD7679G offering auto-restart while BD7673AG uses latch mode.