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AN1621 Datasheet(PDF) 4 Page - STMicroelectronics |
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AN1621 Datasheet(HTML) 4 Page - STMicroelectronics |
4 / 14 page AN1621 APPLICATION NOTE 4/14 Figure 2. Output Current Limiting Characteristic Using Two Current Transformer The calculated value is R1=3.5 Ω Fig. 2 shows the constant current characteristic using two current transformers. The difference from the two current values, at output short-circuit and at current limiting intervention, is propor- tional to the half of chocke ripple current.A choke with higher value or higher switching frequency, can reduce this difference. If constant current feature is not requested to be constant till the output is reaching zero V, one single current transformer can be used. The new limiting current characteristic and the schematic diagram are shown in Fig 3a and 3b:In order to reduce the peak current before hiccup intervention, an offset can be superimposed to the current sensing circuit to an- ticipate the hiccup limiting current intervention, by using the additional network shown below ( figs. 4a and 4b): Using this solution, also the ∆I/∆Vo is higher, reducing the difference from the intervention point and the short circuit current values.This solution can be used with two current transformers too. Figure 3. Output Current Limiting Characteristic Using One Current Transformer 810 12 14 Io 0 5 10 15 20 25 Vo D96IN456 a: Output current limiting characteristic using one current transformer. b: limiting current schematic diagram 468 10 12 14 Io 0 5 10 15 20 25 Vo D96IN457 L1 D1 C6 10T R2 D2 R1 3.5 Ω R8 430 Ω C16 ISEN D5 13 L5991A D96IN458_mod 1T 50T 330pF |
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