SLUSG21 Data sheet

SLUSG21A May 2025 – September 2025 UCC25661

PRODUCTION DATA

The primary-side currents are calculated for component selection purposes. The currents are calculated based on a 110% overload condition.

The primary side RMS load current are calculated using:

Equation 30.

I_{O E} = \frac{π}{2 \sqrt{2}} \times \frac{I_{O}}{n} = \frac{π}{2 \sqrt{2}} \times \frac{1.1 \times 15 A}{16.5} = 1.111 A

The RMS magnetizing current at minimum switching frequency is calculated using:

Equation 31.

I_{M} = \frac{π}{2 \sqrt{2}} \times \frac{N_{P S} V_{O U T}}{{ω L}_{M}} = \frac{π}{2 \sqrt{2}} \times \frac{16.5 \times 12}{2 π \times 64.8 k H z \times 510 μ H} = 0.797 A

The total current in resonant tank is calculated using:

Equation 32.

I_{R} = \sqrt{{I_{M}}^{2} + {I_{O E}}^{2}} = \sqrt{{(1.111 A)}^{2} + {(0.797 A)}^{2} = 1.367 A}