Datasheet

Design Calculations

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13.6 Transformer

Calculated primary inductance:

(62)

Chosen primary inductance:

(63)

Number of primary turns:

(64)

Chosen primary turns: 154 turns

Number of secondary turns:

(65)

Number of auxiliary turns:

(66)

(67)

Maximum flux density:

(68)

Resulting component choice:

(69)

13.7 COFF Current Source

Calculate off-time,

(70)

Choose capacitor C20: 330pF

Calculate R23,

(71)

AN-2091 LM3448 - 230VAC, 6W Isolated Flyback LED Driver SNOA555C–April 2011–Revised May 2013

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