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BA00CC0WCPE2 датащи(PDF) 11 Page - Rohm |
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BA00CC0WCPE2 датащи(HTML) 11 Page - Rohm |
11 / 20 page 11/22 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 ●Operating of the application deficiency - continued 3) When Schottky diode (SBD) remove In the situation that connection is opened and also DC/DC is activated, SW terminal voltage becomes more than rated voltage due to a lack of parts that can accept the current accumulated inside the coil. Consequently IC might be destroyed. To prevent the IC destruction, SBD open protection is functioned. SW terminal is never destroyed as boosting operation is stopped after VOUT terminal detects less than 0.2V. 4) When resistance linked to an ISET terminal short-circuits Since Resistor connected to ISET terminal becomes 0Ω, LED current setting value becomes more than rating. In order to avoid this trouble, this IC has LED current limit protection. By using this function, setting current of rating current driver becomes 0mA, and the current flow of LED is almost same as leak current. ●Control signal input timing When input control signals such as Enable and PWM without completing the standup of supply voltage (VIN), be careful of the following points. ① Input each control signal after VIN exceeds 2.2V and UVLO is off. ② When input Enable and PWM, the standup time should be placed as Min.100µs from 2.2V to stable voltage for VIN. ③ Since a soft start function stops working at the time of following PWM=H when EN=H is held with PWM=L. After EN=H should input a PWM signal within 10ms. ●Start control (EN) and select LED current driver (PWM) This IC can control the IC system by EN terminal and also turns off compulsorily by setting “L” level input voltage 0.4V or below. It also powers on when EN becomes more than “H” level input voltage 1.4V. In the case of EN=H, LED current fixed by ISET resistor with PWM=H flows. When it is selected at PWM=L, LED current stop to flow. EN PWM IC LED current L L Off Off H L On Off L H Off Off H H On Current fixed by ISET ●LED current setting range LED current sets up normal current by resister (RISET) connected to ISET voltage. Each setting current is shown as below. Normal current = 600/RISET [A] Normal current setting range is 10mA to 30mA, and also LED current at off setting is MAX 2µA of leak current. ISET Normal current setting example RISET LED current 20.0kΩ (E96) 30.0mA 24.0kΩ (E24) 25.0mA 30.0kΩ (E24) 20.0mA 56.0kΩ (E24) 10.7mA VIN ① 2.2V EN ② Min. 100µs PWM DC/DC VOUT Figure 6. Control signal input timing VIN EN ③ Min. 10ms PWM DC/DC VOUT |
Аналогичный номер детали - BA00CC0WCPE2 |
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Аналогичное описание - BA00CC0WCPE2 |
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