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CAT4238TD-GT3 Datasheet(PDF) 9 Page - ON Semiconductor |
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CAT4238TD-GT3 Datasheet(HTML) 9 Page - ON Semiconductor |
9 / 14 page CAT4238 © 2008 SCILLC. All rights reserved. 9 Doc. No. MD-5019 Rev. E Characteristics subject to change without notice 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 40V. 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 6mW (about 1.6mA input current with a 3.6V supply). The SW pin clamps at a voltage below its maximum rating of 60V. There is no need to use an external zener diode between Vout and the FB pin. A 50V rated C2 capacitor is required to prevent any overvoltage damage in the open LED condition. Open LED Protection without Zener VIN CAT4238 VIN L Schottky 100V (Central CMSH1-100) VOUT R1 15Ω VFB = 300mV 4.7µF C1 0.22µF C2 FB SHDN SW GND OFF ON 47µH Open LED Switching Waveforms without Zener Open LED Supply Current vs. VIN without Zener 0.0 1.0 2.0 3.0 4.0 5.0 3.0 3.5 4.0 4.5 5.0 5.5 INPUT VOLTAGE [V] Open LED Output Voltage vs. VIN without Zener 35 40 45 50 55 3.0 3.5 4.0 4.5 5.0 5.5 INPUT VOLTAGE [V] |
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