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Zakładka z wyszukiwarką danych komponentów |
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Zakładka z wyszukiwarką danych komponentów |
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LED5000 Arkusz danych(PDF) 31 Page - STMicroelectronics |
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LED5000 Arkusz danych(HTML) 31 Page - STMicroelectronics |
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31 / 52 page  LED5000 Application notes - buck conversion Doc ID 023951 Rev 1 31/51 Figure 19. constant current protection triggering hiccup mode 5.13 Application circuit Figure 20. Evaluation board application circuit The network D3, R4, RS implements an inexpensive overvoltage protection. R4 effect can be neglected during normal operation since the FB biasing current is negligible (tens of nA, see Table 5: Electrical characteristics) but it limits the current flowing in the Zener diode D3. In case the load is disconnected or in case of open LED: AM13503v1 small signal power plane RS R56 TP6 GND R1 10k R3 24.9K C7 1uF 50V TP1 DIM C6 100nF TP4 VLED+ JP1 D3 BZX384-C39 C5 22pF TP8 INH TP5 VLED- C4 470pF TP3 GND JP2 C1 10uF 50V TP2 VIN U1 LED5000 SW 8 VIN 7 BOOT 1 EP EP DIM 2 INH 3 GND 6 COMP 4 FB 5 C3 100nF 50V C2 10uF 50V R2 NM C8 NM D2 R4 47k L1 47uH AM13504v1 |
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