UC2845ANG4

Power Supply Controllers, Monitors Overview

The UC2845ANG4 is a current-mode PWM controller manufactured by Texas Instruments, belonging to the UC2845A series. It operates within an extended industrial temperature range of -40°C to +85°C and utilizes an 8-pin PDIP through-hole package. The device supports Boost, Flyback, and Forward topologies with a maximum switching frequency of 500 kHz. Key electrical parameters include a 1 A output drive current, a 5 V reference voltage, and a maximum duty cycle of 50%. It features a wide supply voltage range from 7.6 V to 30 V, with typical rise and fall times of 50 ns.

Power Supply Controllers, Monitors Feature Summary

• Current-mode control architecture for improved transient response
• Integrated oscillator with external timing resistor and capacitor
• High-side driver capable of sourcing 1 A peak current
• Built-in undervoltage lockout with hysteresis

Power Supply Controllers, Monitors Applications

• DC-DC converter designs using Boost topology
• Isolated power supplies utilizing Flyback converters
• Forward converter applications requiring single-ended output
• General-purpose switching mode power supply circuits

Power Supply Controllers, Monitors Procurement Notes

Verify the specific suffix ANG4 indicates the lead-free PDIP-8 package variant. Confirm the manufacturer source is Texas Instruments rather than other licensees. Ensure the component meets RoHS compliance requirements for your assembly process. Check for any specific handling instructions regarding moisture sensitivity level during storage and reflow soldering procedures.

Power Supply Controllers, Monitors Selection Notes

Select this part when a through-hole solution is required for prototyping or high-reliability applications. The UC2845ANG4 offers a direct pin-compatible alternative to surface-mount variants like UC2845AD. Consider the 50% maximum duty cycle limitation when designing forward converters without reset mechanisms. Evaluate the thermal performance of the DIP package against the required power dissipation levels in your enclosure design.

Power Supply Controllers, Monitors Part Context

This component is part of the widely adopted UC184/284/384xA family of current-mode PWM controllers. The UC2845A variant specifically provides enhanced performance over earlier generations with tighter tolerances on internal references and oscillators. It serves as a foundational control IC for various isolated and non-isolated power conversion architectures commonly found in industrial and consumer electronics.

Power Supply Controllers, Monitors Replacement Considerations

• UC2845AN
• UC2845ADTRG4
• UC2845LDR-8

Power Supply Controllers, Monitors FAQ

What is the maximum duty cycle for the UC2845ANG4?

The maximum duty cycle is limited to 50%.

Does the UC2845ANG4 support synchronous rectification?

No, it does not support synchronous rectification; it drives a single high-side switch.

What is the operating supply voltage range?

The device operates with a supply voltage ranging from 7.6 V to 30 V.