UC3846J

DC DC Switching Controllers Overview

The UC3846J is a current-mode PWM controller manufactured by Texas Instruments, designed for high-performance DC-DC switching applications. It operates within an extended industrial temperature range of -55°C to +125°C and supports multiple converter topologies including Boost, Buck, Flyback, Forward, Full Bridge, Half Bridge, and Push-Pull configurations. The device features a maximum switching frequency of 500 kHz with a maximum duty cycle of 50%. It provides two output channels capable of sourcing up to 500 mA each, with a regulated 5.1 V reference voltage. The component is housed in a 16-pin CDIP package with through-hole mounting, exhibiting rise and fall times of 50 ns.

DC DC Switching Controllers Feature Summary

• Supports versatile power conversion topologies such as flyback, forward, half-bridge, and push-pull converters
• Utilizes current-mode control architecture for rapid transient response and inherent line feedforward compensation
• Integrated oscillator allows precise timing control with adjustable duty cycle limitations
• Robust protection mechanisms include under-voltage lockout and thermal shutdown capabilities

DC DC Switching Controllers Applications

• Industrial power supply systems requiring wide operating temperature ranges
• Uninterruptible power supplies (UPS) utilizing flyback or forward converter designs
• Battery charging circuits employing step-up or step-down regulation
• Telecommunications equipment power modules

DC DC Switching Controllers Procurement Notes

Verify the specific suffix designation against the manufacturer's official documentation to confirm pin compatibility and electrical specifications. Ensure the selected variant matches the required package type and temperature grade for the intended application environment. Cross-reference ordering information with authorized distributors to confirm availability and authenticity. Review the latest datasheet revisions for any updates regarding mechanical dimensions or recommended circuit parameters before finalizing procurement decisions.

DC DC Switching Controllers Selection Notes

Select this component when designing systems that demand operation across extreme industrial temperatures ranging from -55°C to +125°C. The through-hole CDIP package is suitable for applications requiring robust mechanical stability or legacy board layouts. Consider the 500 kHz switching capability for balancing efficiency and component size. Verify that the 50% maximum duty cycle aligns with the chosen transformer turns ratio and input voltage range for the specific topology being implemented.

DC DC Switching Controllers Part Context

The UC3846J belongs to the UC384x series of current-mode PWM controllers, which are widely recognized for their reliability in power management applications. This series offers a balance of performance and ease of use for various isolated and non-isolated converter designs. The J suffix typically denotes the military/industrial temperature grade and ceramic DIP packaging, distinguishing it from commercial variants like the N or DW models which may have different thermal or mechanical characteristics.

DC DC Switching Controllers Replacement Considerations

• UC3846N
• UC3846DW
• UC3846NG4

DC DC Switching Controllers FAQ

What is the maximum operating temperature for the UC3846J?

The UC3846J is rated for an extended industrial temperature range, with a maximum operating temperature of +125°C.

Which package style does the UC3846J utilize?

The UC3846J is available in a 16-pin Ceramic Dual In-Line Package (CDIP) designed for through-hole mounting.

Can the UC3846J be used in half-bridge converter applications?

Yes, the UC3846J supports multiple topologies including half-bridge, full bridge, push-pull, flyback, and forward converters.