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BD9778HFP Datasheet(PDF) 8 Page - Rohm |
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BD9778HFP Datasheet(HTML) 8 Page - Rohm |
8 / 17 page 8/16 Technical Note Timing chart (BD9781HFP) - While in basic operation mode - While in overcurrent protection mode FB VIN SW EN/SYNC Internal OSC Fig.27 Fig.28 External synchronizing function (BD9781HFP) In order to activate the external synchronizing function, connect the frequency setting resistor to the RT pin and then input a synchronizing signal to the EN/SYNC pin. As the synchronizing signal, input a pulse wave higher than a frequency determined with the setting resistor (RT). On the BD9781HFP, design the frequency difference to be within 50%. Furthermore, set the pulse wave duty between 10% and 90%. Fig.29 FSYNC Internal OSC : For RT only : For external synchronization Output short circuit FB SW IO Internal OSC Auto reset Auto reset Auto reset Auto reset 2010.02 - Rev. B www.rohm.com © 2010 ROHM Co., Ltd. All rights reserved. BD9778F, BD9778HFP, BD9001F, BD9781HFP |
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