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CAT4238 Datasheet(PDF) 8 Page - ON Semiconductor |
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CAT4238 Datasheet(HTML) 8 Page - ON Semiconductor |
8 / 12 page CAT4238 www.onsemi.com 8 Open LED Protection In the event of an “Open LED” fault condition, the CAT4238 will continue to boost the output voltage with maximum power until the output voltage reaches approximately 40 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 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 18. Open LED Protection without Zener VIN CAT4238 L Schottky 100 V (Central CMSH1−100) 15 W 4.7 mF 0.22 mF FB SW GND OFF ON 47 mH VIN C1 VOUT SHDN VFB = 300 mV C2 R1 Figure 19. Open LED Switching Waveforms without Zener 2 ms/div Figure 20. Open LED Supply Current vs. VIN without Zener INPUT VOLTAGE (V) 5.0 4.5 4.0 3.5 3.0 0 2.0 1.0 4.0 5.0 5.5 3.0 Figure 21. Open LED Output Voltage vs. VIN without Zener INPUT VOLTAGE (V) 5.0 4.5 4.0 3.5 3.0 35 40 45 50 5.5 55 |
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Similar Description - CAT4238 |
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