LM5185PWPR

Overview

The LM5185PWPR is an automotive-grade primary-side regulated (PSR) flyback controller manufactured by Texas Instruments. It operates with an input voltage range of 4.5 V to 100 V and supports a switching frequency up to 350 kHz. The device features a quiescent current of 425 uA and functions within a temperature range of -40°C to +125°C. It utilizes a HTSSOP-14 package for surface mount installation. This component provides isolated output regulation without requiring an optocoupler or secondary-side feedback loop, simplifying the design of high-voltage DC-DC converters.

Feature Summary

• Primary-side regulation capability eliminates the need for optocouplers and auxiliary windings
• Integrated high-voltage startup circuit enables operation from wide input voltage ranges
• Supports external MOSFET configuration for flexible power stage implementation

Applications

• Automotive LED lighting drivers
• Isolated DC-DC converter designs
• Auxiliary power supplies in vehicle electronics

Procurement Notes

Verify the specific suffix PWPR against the official datasheet to confirm package type and tape-and-reel specifications. Ensure the component meets AEC-Q100 qualification requirements if intended for automotive applications. Cross-reference the manufacturer part number with authorized distributors to confirm authenticity and traceability before procurement.

Selection Notes

Select this controller when designing isolated flyback converters requiring primary-side regulation to reduce component count. Consider the 100 V maximum input rating and 350 kHz switching frequency for efficiency and size optimization. Evaluate thermal performance within the specified operating temperature range and ensure compatibility with external MOSFET selection for the target power level.

Part Context

This component belongs to the LM5185 family of PSR flyback controllers designed for high-voltage applications. It is distinct from integrated switch regulators like the PM5180, as it requires an external power MOSFET. The device targets automotive environments, offering robustness against electrical transients and wide operating temperature variations typical in vehicle systems.

Replacement Considerations

Consult the official datasheet for direct pin-to-pin replacements or functional equivalents within the LM5185 series. Verify that any substitute maintains the same HTSSOP-14 package and automotive qualification standards.