UC2840DW

Overview

The UC2840DW is a high-performance current-mode PWM controller manufactured by Texas Instruments, designed for off-line and DC-to-DC converter applications. It operates within a supply voltage range of 7 V to 30 V and supports switching frequencies up to 500 kHz. The device features a maximum duty cycle of 100% and provides an output drive current of 1 A. It is housed in a 16-pin SOIC package and functions reliably across an operating temperature range of -40 °C to +85 °C.

Feature Summary

• Supports 100% maximum duty cycle for continuous conduction mode operation
• Integrated current-mode control architecture for rapid transient response
• High-side driver capable of sourcing and sinking 1 A peak current

Applications

• Off-line power supplies
• Forward converters
• Push-pull converters
• Half-bridge converters

Procurement Notes

Verify the specific suffix against official Texas Instruments documentation to confirm pinout compatibility and electrical specifications. Ensure the component meets RoHS compliance requirements for your target market. Cross-reference the manufacturer part number with authorized distributors to validate authenticity and traceability before procurement.

Selection Notes

Select this controller when a 100% duty cycle capability is required for specific transformer reset or continuous conduction topologies. Compare against the UC2841 series if adjustable frequency trimming via an external resistor is necessary instead of fixed internal timing. Evaluate thermal management needs based on the SOIC-16 package limitations under high load conditions.

Part Context

The UC2840 belongs to the UC284x family of current-mode PWM controllers from Texas Instruments. It shares architectural similarities with the UC2841 but differs primarily in its fixed maximum duty cycle characteristic. This family is widely utilized in industrial power conversion systems requiring robust current-mode regulation and high reliability.

Replacement Considerations

• UC2840DWR
• UC2840DR