UC3825BDW

AC DC Converters, Offline Switchers Overview

The UC3825BDW is a high-speed PWM controller manufactured by Texas Instruments, originally part of the Unitrode portfolio. It supports multiple topologies including boost, flyback, forward, half-bridge, and push-pull. The device features dual totem-pole outputs with a peak current capability of 1.5A. It operates within a supply voltage range of 8.4V to 30V and functions at switching frequencies up to 1MHz. The component is housed in a 16-SOIC package and operates between 0°C and +70°C.

AC DC Converters, Offline Switchers Feature Summary

• Dual independent totem-pole output drivers capable of sourcing and sinking high peak currents for direct MOSFET or IGBT gate drive
• Integrated high-frequency oscillator allowing precise frequency setting via external components and supporting clock synchronization
• Built-in per-cycle current limiting with leading edge blanking to prevent false triggering from switch turn-on transients
• Dedicated soft-start circuitry that gradually increases pulse width during startup to minimize inrush current and output overshoot

AC DC Converters, Offline Switchers Applications

• High-frequency DC-DC converters requiring compact magnetic components
• Push-pull and half-bridge power supply topologies
• Flyback and forward converter designs
• Boost converter applications
• 1MHz/100W sine wave power signal sources

AC DC Converters, Offline Switchers Procurement Notes

Verify the specific suffix 'BDW' against the manufacturer's current datasheet to confirm exact electrical tolerances and temperature ratings. Ensure compatibility with the intended PCB footprint for the 16-SOIC package. Check for RoHS compliance status if required by the final assembly specifications. Confirm availability through authorized distributors as lead times may vary.

AC DC Converters, Offline Switchers Selection Notes

Select this component when designing systems requiring operation at switching frequencies up to 1MHz to reduce passive component size. It is suitable for applications needing robust overcurrent protection with per-cycle limiting. Consider the dual-output configuration for bridge topologies. Verify that the 1.5A peak drive current meets the gate charge requirements of the selected power switches.

AC DC Converters, Offline Switchers Part Context

This component belongs to the UC3825 family of high-speed PWM controllers, originally developed by Unitrode before its acquisition by Texas Instruments. The family is widely recognized for its performance in high-frequency switching applications. The UC3825 series offers improvements over earlier models such as the UC3823, providing higher bandwidth error amplifiers and faster response times.

AC DC Converters, Offline Switchers Replacement Considerations

The UC3825B is an enhanced version of the standard UC3825 with improved UVLO thresholds and overcurrent comparator specifications. Other compatible parts include the UC3825DW and UC3825ADW. Verify pinout and electrical parameters before substituting.