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データシートサーチシステム |
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W-6237TD-T データシート(PDF) 9 Page - Copal Electronics |
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W-6237TD-T データシート(HTML) 9 Page - Copal Electronics |
9 / 13 page ![]() W-6237 9 Open LED Protection In the event of an “Open LED” fault condition, the W-6237 will continue to boost the output voltage with maximum power until the output voltage reaches approximately 35 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 4 mW (about 1 mA input current with a 3.6 V supply). The SW pin clamps at a voltage below its maximum rating of 60 V. There is no need to use an external zener diode between Vout and the FB pin. A 50 V rated C2 capacitor is required to prevent any overvoltage damage in the open LED condition. Figure 21. Open LED Protection without Zener VIN W-6237 L Schottky 100 V (Central CMSH1 100) R1 15 4.7 F 0.22 F FB SW GND OFF ON 33 H VIN C1 VOUT SHDN VFB = 300 mV C2 Figure 22. Open LED Switching Waveforms without Zener 10 sec/div SW PIN 10 V/div Figure 23. Open LED Supply Current vs. VIN without Zener INPUT VOLTAGE (V) 5.0 4.5 4.0 3.5 3.0 2.5 0 0.5 1.0 1.5 2.0 Figure 24. Open LED Output Voltage vs. VIN without Zener INPUT VOLTAGE (V) 5.0 4.5 4.0 3.5 3.0 2.5 30 35 40 45 50 |
同様の部品番号 - W-6237TD-T |
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同様の説明 - W-6237TD-T |
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