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27 / 42 page  27/42 AN1262 APPLICATION NOTE Table 18. G1(j ω) Implementation: secondary feedback (II) More flexibility is given by the network illustrated in figure 14, applicable with the L6590 and L6590D which have the error amplifier on board. For this circuit, to be able to find a positive value for RF, the condition is: , which is less stringent than (20). The resulting function is: , and Table 19 shows how its quantities are defined. Figure 14. Secondary feedback: TL431 + optocoupler circuit (III) Symbol Definition RL RL ≈ 0.27 to 2.7 [kΩ] RH RC, KB Select from table 17 RB CF RF CCOMP R H V out 2.5 – 2.5 ------------------------- R L ⋅ = R B CTR min V out 3.5 – I Cmax ------------------------- K B ⋅⋅ < C F CTR max R COMP // RC () ⋅ 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 // RC () ⋅⋅ ⋅ --------------------------------------------------------------- = CTR max CTR min ----------------------- G1 c π 180 ---------- Φ1 c ⋅ tan R F2 ------------------------------------------- 1 R C R E ------- + Vout 3.5 – I Cmax ------------------------- ⋅⋅ ⋅ ≤ G1 j ω () V COMP ∆ V out ∆ ----------------------- V CO MP ∆ V E ∆ ----------------------- V E ∆ I C ∆ ----------- ⋅ = I C ∆ I F ∆ -------- I F ∆ V K ∆ ----------- V K ∆ V out ∆ --------------- ⋅⋅ ⋅ CTR max R E R F2 ⋅⋅ R E R C + () · R B R H C F1 ⋅⋅ -------------------------------------------------------------------- 1 j ω ----- 1j ω R H R F1 + () C F1 ⋅⋅ + 1j ω R F2 C F2 ⋅⋅ + ---------------------------------------------------------------- ⋅⋅ == Vout RB RH RL TL431 CF1 L6590 L6590D Vcc VK COMP VFB RE RC RF2 CF2 IF IC VE RF1 |
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