75W SMPS with TEA1507 Quasi- Resonant Flyback controller - NXP ...

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Philips Semiconductors Application Note AN00047 As can be seen in Figure 28 the MOSFET is switched on again at the valley of the drain voltage. The voltage level in this situation is not zero but slightly above zero. This is called LVS, which result in switch-on losses in the MOSFET. 42
Philips Semiconductors Application Note AN00047 APPENDIX 3 TRANSFORMER DATA 1 2 6 7 8 9 43 17 18 16 15 14 13 12 11 Figure 29 Transformer pin diagram Electrical data Conditions Value Unit Inductance 6-9 1 Leakage inductance 2 10 1V @ 10kHz 1000 ±5% μH 0.2V @ 100kHz, all secondary windings shorted Core data Material Airgap ≤ 10 μH E42/21/15 3C85 TBD μm Winding data Description Number of turns Wire dia Primary windings 6-7 Main input 28 8 x 0.2 8-9 Main input 27 8 x 0.2 1-2 Auxiliary 3 0.2 Secondary windings 10-11 Main output 185V 34 8 x 0.2 12-13 80V 15 0.2 14-15 16V 3 0.3 16-18 10V 2 0.2 18-17 -10V 2 0.2 Table 9 Transformer data Note 1: For primary inductance measurements pins 7 and 8 have to be interconnected Note 2: For leakage inductance measurements all secondary pins have to be interconnected
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75W SMPS with TEA1507 Quasi- Resonant Flyback controller - NXP ...

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