UC3825Q

DC DC Switching Controllers Overview

The UC3825Q is a high-speed PWM controller manufactured by Texas Instruments, designed for versatile DC-DC switching applications. It supports multiple topologies including boost, buck, flyback, forward, full bridge, half bridge, and push-pull configurations. The device features a 20-pin PLCC package with J-leads. Key electrical parameters include a switching frequency range of 340 kHz to 460 kHz and a maximum duty cycle of 85%. It operates within a supply voltage range of 8.4 V to 30 V and functions reliably across an ambient temperature range of 0°C to 70°C.

DC DC Switching Controllers Feature Summary

• Supports comprehensive power converter topologies including step-up, step-down, and isolated variants
• Integrates control characteristics such as current limiting, enable, frequency control, ramp compensation, and soft start
• Provides positive output configuration via a dedicated transistor driver stage

DC DC Switching Controllers Applications

• Boost converter designs
• Buck converter implementations
• Flyback power supplies
• Forward converter systems
• Half-bridge and push-pull circuits

DC DC Switching Controllers Procurement Notes

Verify component status carefully as the UC3825Q is officially listed as obsolete and no longer in production. Confirm availability through authorized distributors or check for equivalent active replacements if long-term supply stability is required. Ensure the specific package variant matches design requirements before ordering.

DC DC Switching Controllers Selection Notes

Select this component for applications requiring flexible topology support and integrated soft-start functionality. Note that it utilizes a 20-PLCC package which may impact PCB layout compared to standard SOIC options. Evaluate the 340-460 kHz switching range against system efficiency and EMI constraints. Consider the obsolete status when planning for future manufacturing phases.

DC DC Switching Controllers Part Context

The UC3825Q belongs to the UC3825 series of high-speed PWM controllers from Texas Instruments. It is part of a family of power management ICs designed for robust switching regulator performance. The device shares functional similarities with other members of the UC1825/2825/3825 series but is distinguished by its specific 20-PLCC packaging and associated thermal and pinout characteristics.

DC DC Switching Controllers Replacement Considerations

Public confirmed substitutes include UC3825DWTR and UC3825DW.