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BD2045AFJ 데이터시트(PDF) 9 Page - Rohm |
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BD2045AFJ 데이터시트(HTML) 9 Page - Rohm |
9 / 13 page BD2045AFJ, BD2055AFJ Technical Note 9/12 www.rohm.com 2009.05 - Rev.A © 2009 ROHM Co., Ltd. All rights reserved. 4. Under voltage lockout (UVLO) UVLO circuit prevents the switch from turning on until the VIN exceeds 2.3V(Typ.). If the VIN drops below 2.2V(Typ.) while the switch turns on, then UVLO shuts off the power switch. UVLO has hysteresis of a 100mV(Typ). Under voltage lockout circuit works when the switch is on (EN,/EN signal is active). 5. Error flag (/OC) output Error flag output is N-MOS open drain output. At detection of over current, thermal shutdown, low level is output. Over current detection has delay filter. This delay filter prevents instantaneous current detection such as inrush current at switch on, hot plug from being informed to outside. V/EN VOUT IOUT V/OC Output shortcircuit Thermal shut down delay Fig.38 Over current detection, thermal shutdown timing (BD2045AFJ) VEN VOUT IOUT V/OC Output shortcircuit Thermal shut down delay Fig.39 Over current detection, thermal shutdown timing (BD2055AFJ) |
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