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SLB0587 Datasheet(PDF) 9 Page - Siemens Semiconductor Group |
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SLB0587 Datasheet(HTML) 9 Page - Siemens Semiconductor Group |
9 / 22 page Semiconductor Group 9 SLB 0587 Application Circuit (Figure 4) The suggested circuit design of the SLB 0587 performs the following functions: q Current supply for the circuits (R 1, R 3, C 2, C 3, C 6, D1, D2). q Filtered signal for synchronization of the internal time base (PLL circuit) with line frequency (R 2, C 4). q For specific applications C 4 and R 2 can be varied according to figure 5. An increase for C 4 and R 2 causes a slight reduction of the lamp brightness but at the same time an im- provement of interference immunity of the internal PLL against line voltage spikes. q Integration unit for internal PLL circuit (C 5, R 10) Combining R 10 and C 5 (figure 6) determines within certain limits the following factors – Start-up behaviour of internal PLL after line failure – Ripple control behaviour (periodic shifts of lamp brightness if ripple control signals represent) q Protection of the user (R 8, R 9) q Sensitivity setting of the sensor (R 7) q Current limitation in the case of reverse polarity of the extension (R 5, R 6) Both resistors can be omitted if no extension is connected. In this case pin 6 must be con- nected to V SS (pin 7). q D3: Reduction of positive voltages which may arise during the triggered state at the gate of some triacs, to values below V DD + 0.3 V by diode forward voltage. If suitable triacs are used, diode D3 can be omitted. q Dr, C 1 are used for EMI suppression. Depending on the application the EMI suppression is to be dimensioned in acc. with VDE 0875/part 1 (general) VDE 0550/part 6 (chokes) or corresponding the national regulations e.g. 1.4....2 mH, Q = 11....24 |
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Similar Description - SLB0587 |
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