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BM1R00129-E2 Datasheet(PDF) 5 Page - Rohm |
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BM1R00129-E2 Datasheet(HTML) 5 Page - Rohm |
5 / 26 page 4/22 TSZ02201-0F4F0A2BM1R0-1-2 © 2016 ROHM Co., Ltd. All rights reserved. 20. Apr. 2016 Rev.002 www.rohm.com TSZ22111 • 15 • 001 BM1R00xxxF Description of Block 1. SET_COMP Block Monitors the DRAIN terminal voltage, and outputs a signal to turn ON the FET if the DRAIN terminal voltage is less than or equal to -100mV (Typ). 2. RESET_COMP Block Monitors the DRAIN terminal voltage and outputs a signal to turn OFF the FET if the DRAIN terminal voltage is more than or equal to -6mV (Typ). 3. Compulsion ON TIME Block When the FET is turned ON due to SET_COMP detection, noise occurs on the DRAIN terminal. To prevent the noise from turning OFF the FET, an ON state should be forced for a certain time. Compulsion ON time is within a range of 0µs (None) to 3.5µs, which is different for each series number (refer to page.1 table). 4. Compulsion OFF TIME Block When the FET is turned OFF due to RESET_COMP detection, resonance waveforms appear on the DRAIN terminal. To prevent the noise from turning ON the FET, an OFF state should be forced for a certain time. Compulsion OFF time is within a range of 1.3µs to 4.6µs, which is different for each series number (refer to page.1 table). Operation sequence of each block is shown on the figure below . About Maximum Input Frequency The Maximum Operating Frequency of the IC depends on the Compulsion ON/OFF Time. For example, BM1R00026F and BM1R00146F Compulsion ON and OFF Time is both equal to 0μs. Considering a variation of 9%, the maximum input frequency is given by the following: fMAX = 1 / ((0μs + 1.3μs) x 1.09) = 706kHz However, since the frequency varies greatly due to the input voltage and load, it will be necessary to select the series in accordance with each application. 0V 二次側 DRAIN SET COMP ON ON VGATE 0V 0V RESET COMP RESET 0V ON -100mV RESET -6mV -6mV VOUT Compulsion ON Time 0V ON TIME 0V OFF TIME ON TIME OFF TIME -100mV -100mV -6mV -6mV Compulsion OFF Time ON -100mV Figure 1. Operation sequence |
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