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BA00DD0WFPV5 bảng dữ liệu(PDF) 9 Page - Rohm |
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BA00DD0WFPV5 bảng dữ liệu(HTML) 9 Page - Rohm |
9 / 20 page 9/22 Datasheet Datasheet BD60A00NUX BD60A60NUX © 2012 ROHM Co., Ltd. All rights reserved. www.rohm.com TSZ22111・15・001 TSZ02201-0G3G0C200320-1-2 27.SEP.2012 Rev.001 ●Protection - continued ・ LED terminal over voltage protection When FB terminal becomes higher than 5.9V (Typ.), IC senses the situation trouble after 100µs and then stops constant current driver and DC/DC. Therefore IC becomes never heated, even if output and FB are both shorted. Moreover, if FB terminal becomes lower than 5.9V (Typ.), IC senses normal condition and activates constant current driver. ・ Prevention of LED terminal over voltage protection malfunction As the below diagrams show, voltage drop of FB terminal becomes slow when PWM operates by connecting capacitor on a parallel with LED and decreasing LED current. At that time, LED terminal voltage protection works after condition of FB terminal > 5.9V keeps more than 100µs. LED terminal voltage protection might stop current driver and DC/DC and also turns off LEDs, so that please set up coil selection and LED current setting less than 100µs until FB terminal < 5.9V. ・ Low voltage detect protection (UVLO) Supply voltage(VIN) becomes lower than low voltage detect voltage 2.2V(Typ.), IC stops DC/DC and constant current driver. Moreover, this function can be off by boosting supply voltage up to more than hysteresis voltage. DC/DC Current Driver VIN reset 2.20 V 5% 0V Active Active 2.32 V FB VOUT Current Driver FB reset 5.9 V Active DC/DC Active 100µs reset reset reset PWM L H EN L H Current Driver FB reset 5.9V 0.7V Active DC/DC Active 100µs reset reset reset PWM L H |
Số phần tương tự - BA00DD0WFPV5 |
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Mô tả tương tự - BA00DD0WFPV5 |
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