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Zakładka z wyszukiwarką danych komponentów |
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Zakładka z wyszukiwarką danych komponentów |
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DFS04M Arkusz danych(PDF) 25 Page - STMicroelectronics |
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DFS04M Arkusz danych(HTML) 25 Page - STMicroelectronics |
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25 / 42 page  25/42 AN1262 APPLICATION NOTE Figure 12. Secondary feedback: TL431 + optocoupler circuit (I) Table 16. G1(j ω) Implementation: secondary feedback (I) This technique provides very good regulation of the output voltage and galvanic isolation from the primary side at the same time. In Table 16 it is possible to find the design relationships useful to derive the part values. Icmax is specified in the Datasheet (2.5mA). The following condition should be met: , (20) otherwise t will not be possible to find a positive value for RF. If the condition (20) is not met, an optocoupler with a narrower CTRmin - CTRmax spread should be selected. If that is not possible, either a higher fc or a lower Φm should be selected and the calculations from step a) to step e) redone. Symbol Definition RL RL ≈ 0.27 to 2.7 [kΩ] RH RB CF RF CCOMP Vout RB RH RL TL431 CF L6590 L6590D L6590A COMP VK IF IC CCOMP IC VCOMP 1.5 3.5 RCOMP = ∆VCOMP ∆IC 1 mA VFB Not needed in the L6590A RF R H V out 2.5 – 2.5 ------------------------- R L ⋅ = R B CTR min V out 3.5 – I Cmax ------------------------- ⋅ < C F CTR max R COMP ⋅ R B R H G1 0 ⋅⋅ ----------------------------------------------- = R F 1 2 π f Z C F ⋅⋅ ⋅ -------------------------------- R H – = C CO M P 1 2 π f P R COMP ⋅⋅ ⋅ --------------------------------------------- = CTR max CTR min ----------------------- G1 c π 180 ---------- Φ1 c ⋅ tan R CO MP ------------------------------------------- V out 3.5 – I Cmax ------------------------- ⋅⋅ ≤ |
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