UC3844ANG4

Power Supply Controllers, Monitors Overview

The UC3844ANG4 is a current-mode PWM controller manufactured by Texas Instruments, designed for high-frequency switching power supplies. It operates within an input voltage range of 12 V to 28 V and features a maximum switching frequency of 500 kHz. The device provides a single output capable of sourcing 1 A peak current with a maximum duty cycle of 100%. It supports multiple topologies including Boost, Buck, Flyback, and Forward configurations. The component functions reliably across a temperature range of 0°C to +70°C and is housed in an 8-pin PDIP package.

Power Supply Controllers, Monitors Feature Summary

• Implements current-mode control architecture for rapid transient response and inherent overcurrent protection
• Features integrated under-voltage lockout with distinct turn-on and turn-off thresholds for stable startup
• Provides a high-precision internal 5 V reference voltage source for external oscillator and feedback circuits

Power Supply Controllers, Monitors Applications

• Offline flyback converter designs for isolated power supplies
• Forward converter implementations requiring high efficiency
• Boost and buck DC-DC conversion stages
• Battery charger power management systems

Power Supply Controllers, Monitors Procurement Notes

Verify the specific suffix 'G4' confirms lead-free compliance and RoHS status as per manufacturer specifications. Confirm the PDIP-8 through-hole package matches your PCB footprint requirements. Ensure the operating temperature range aligns with your environmental constraints. Cross-reference the datasheet revision to confirm pinout compatibility with legacy designs.

Power Supply Controllers, Monitors Selection Notes

Select this component when designing single-ended converters requiring peak current mode control. It is suitable for applications needing a 1 A drive capability for MOSFET gates without external drivers. Consider the 500 kHz frequency limit when sizing magnetic components. Verify that the 100% duty cycle capability meets your specific topology requirements.

Power Supply Controllers, Monitors Part Context

This part belongs to the UC384x series of current-mode PWM controllers from Texas Instruments. It shares functional similarities with the UC3842 and UC3843 but differs in undervoltage lockout thresholds and maximum duty cycle characteristics. The series is widely used in general-purpose offline and DC-DC power supply applications.

Power Supply Controllers, Monitors Replacement Considerations

UC3842AN: Similar current-mode controller but with different UVLO thresholds and lower maximum duty cycle. UC3843AN: Offers higher maximum duty cycle than UC3842 but differs in startup current characteristics compared to UC3844.