107uH 30A BUCK CONVERTER SENDUST INDUCTOR(USED)

This specification describes a high-power inductor designed for the output stage of a Buck (Step-Down) Converter. Using Sendust (also known as Kool Mµ) as the core material makes this component ideal for high-current applications where efficiency and thermal management are critical.

• Inductance (L):107uH. This value determines the amount of "ripple" in the output current; a higher value like this is often used in high-voltage buck converters (e.g., 48V to 12V) to keep the output stable.

• Current Rating (I_DC):30A. This is a substantial power level (e.g., at 12V output, this inductor is handling 360W of power).

• Core Material:Sendust (Al-Si-Fe alloy).

  • Composition: Approximately 85% Iron, 9% Silicon, and 6% Aluminum.

  • Color Code: Typically coated in Black (industry standard for Sendust).

At 30A, the inductor faces two major challenges: heat from resistance (copper loss) and heat from magnetic switching (core loss). Sendust is chosen because it sits in the "Goldilocks" zone of performance:

1. Lower Losses than Iron Powder: While iron powder is cheaper, it would get extremely hot at 30A due to higher core losses. Sendust reduces these losses significantly, allowing for higher efficiency.

2. No "Thermal Aging": Unlike iron powder, which can degrade over time if kept at high temperatures, Sendust is a stable alloy that does not age. This makes it much more reliable for industrial or 24/7 power supplies.

3. Audible Silence: Sendust has "Near-Zero Magnetostriction." This means the material doesn't physically expand and contract as much under magnetic fields, eliminating the "buzzing" or "whining" noise common in high-power converters.

4. Soft Saturation: Like other powder cores, it doesn't "crash" if you exceed 30A. If the current spikes to 35A, the inductance might drop from 107uH to 80uH gradually, preventing a catastrophic short circuit in your switching transistors.