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W-6139TD-GT データシート(PDF) 9 Page - Copal Electronics |
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W-6139TD-GT データシート(HTML) 9 Page - Copal Electronics |
9 / 13 page W-6139 9 Open LED Protection In the event of an “Open LED” fault condition, the W-6139 will continue to boost the output voltage with maximum power until the output voltage reaches approximately 24 V. Once the output exceeds this level, the internal circuitry immediately places the device into a very low power mode where the total input power is limited to about 6 mW (about 1.6 mA input current with a 3.6 V supply). The SW pin clamps at a voltage below its maximum rating of 40 V. There is no need to use an external zener diode between VOUT and the FB pin. A 35 V rated C2 capacitor is required to prevent any overvoltage damage in the open LED condition. Figure 18. Open LED Protection Circuit VIN W-6139 L Schottky 40 V (Central CMSH05 4) D 4.7 F C1 1 F C2 R1 15 FB SW GND ON 22 H OFF VIN VOUT SHDN Figure 19. Open LED Disconnect and Reconnect Figure 20. Open LED Disconnect e g a t l o V t u p t u O D E L n e p O . 2 2 e r u g i F t n e r r u C y l p p u S D E L n e p O . 1 2 e r u g i F ) V ( E G A T L O V T U P N I ) V ( E G A T L O V T U P N I 5.5 5.0 4.5 4.0 3.5 3.0 1.0 1.5 2.0 2.5 5.5 5.0 4.5 4.0 3.5 3.0 15 20 25 30 35 |
同様の部品番号 - W-6139TD-GT |
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同様の説明 - W-6139TD-GT |
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