UC3846QTR

DC DC Switching Controllers Overview

The UC3846QTR is a current-mode PWM controller manufactured by Texas Instruments, designed for high-performance switching power supplies. It operates within a junction temperature range of 0°C to 70°C and supports multiple topologies including Boost, Flyback, Forward, Half Bridge, and Push-Pull configurations. The device features a maximum switching frequency of 500 kHz and a duty cycle limit of 50%. It provides two output channels with a peak drive current of 500 mA and includes an internal 5.1 V reference. Housed in a 20-PLCC package, it integrates synchronous rectification control and clock synchronization capabilities.

DC DC Switching Controllers Feature Summary

• Integrates current-mode PWM control with dedicated synchronous rectification driver outputs for enhanced efficiency in isolated converter designs.
• Supports clock synchronization to allow multiple controllers to operate on the same bus without interference.
• Includes built-in soft-start functionality and precise current limiting for reliable startup and fault protection.

DC DC Switching Controllers Applications

• High-efficiency flyback converters requiring active clamp or synchronous rectification
• Half-bridge and full-bridge power supply architectures
• Push-pull DC-DC converter designs

DC DC Switching Controllers Procurement Notes

Verify component authenticity through authorized distributors as this part is marked obsolete. Confirm package integrity upon receipt due to potential long-term storage effects. Check datasheet revisions for any pinout or electrical specification updates that may affect legacy designs. Ensure ESD handling protocols are followed during assembly.

DC DC Switching Controllers Selection Notes

Select this component for applications requiring synchronized multi-controller operation or integrated synchronous rectification control. Consider the 20-PLCC package constraints for PCB layout. Evaluate thermal management requirements given the 70°C operating limit. Verify compatibility with existing gate drive requirements for external MOSFETs.

DC DC Switching Controllers Part Context

The UC3846 series represents a family of current-mode PWM controllers from Texas Instruments. The UC3846QTR specifically denotes the qualified version in a surface-mount PLCC package. It shares core architecture with the UC3846N and UC3846DW but offers distinct packaging and potentially extended qualification standards suitable for industrial applications.

DC DC Switching Controllers Replacement Considerations

• UC3846DWTR

DC DC Switching Controllers FAQ

Does the UC3846QTR support synchronous rectification?

Yes, the UC3846QTR includes dedicated outputs for controlling synchronous rectifier MOSFETs, eliminating the need for external diodes in secondary-side rectification.

Can the UC3846QTR be synchronized to an external clock?

Yes, the device features a clock synchronization input pin that allows it to lock onto an external clock signal to prevent noise accumulation in multi-unit systems.