UC2845AN

Power Supply Controllers, Monitors Overview

The UC2845AN is a current-mode PWM controller manufactured by Texas Instruments, designed for DC-DC switching applications. It operates within a supply voltage range of 10 V to 30 V and supports a maximum switching frequency of 500 kHz. The device features an output stage capable of sourcing 1 A of drive current with rise and fall times of 50 ns. It accommodates Boost, Flyback, and Forward topologies with a maximum duty cycle of 50%. The component is housed in an 8-pin PDIP package and functions reliably across an operating temperature range from -40°C to +85°C.

Power Supply Controllers, Monitors Feature Summary

• Implements current-mode control architecture for enhanced transient response and simplified compensation.

Power Supply Controllers, Monitors Applications

• Boost converter designs
• Flyback power supplies
• Forward converter circuits

Power Supply Controllers, Monitors Procurement Notes

Verify the specific suffix 'AN' confirms the through-hole PDIP-8 packaging variant rather than surface-mount options. Confirm that the manufacturer designation remains Texas Instruments, as other vendors may produce compatible parts under different branding. Ensure the order specifies the standard tube packaging format associated with this package type.

Power Supply Controllers, Monitors Selection Notes

Select this part when a through-hole mounting solution is required for industrial or legacy board layouts. The 1 A output drive capability suits moderate-power isolated and non-isolated converters. Verify that the 50% maximum duty cycle constraint aligns with the specific transformer turns ratio requirements of the target application design.

Power Supply Controllers, Monitors Part Context

This component belongs to the UCx84x family of current-mode PWM controllers. It shares functional similarities with the UC1845 and UC3845 series, differentiated primarily by operating temperature ranges and manufacturing origins. The UC2845AN specifically addresses commercial-grade temperature requirements while maintaining the robust drive characteristics of the broader family.

Power Supply Controllers, Monitors Replacement Considerations

Direct pin-compatible substitutes include the UC2845AD8 (SOIC-8) for surface-mount transitions. Cross-manufacturer equivalents such as the STMicroelectronics UC2845BN offer similar specifications but require verification of mechanical footprint compatibility.