Datenblatt-Suchmaschine für elektronische Bauteile |
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BD9778HFP Datenblatt(PDF) 13 Page - Rohm |
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BD9778HFP Datenblatt(HTML) 13 Page - Rohm |
13 / 17 page 13/16 Technical Note <Procedure> 1. Check to ensure output causes no oscillation at the maximum load in closed loop. Isolate (1) and (2) and insert Vm (with amplitude of approximately 100 mVpp). Measure (probe) the oscillation of (1) to that of (2). 2. 3. Heat loss Furthermore, the phase margin can also be measured with the load responsiveness. Measure variations in the output voltage when instantaneously changing the load from no load to the maximum load. Even though ringing phenomenon is caused, due to low phase margin, no ringing takes place. Phase margin is provided. However, no specific phase margin can be probed. To measure the open loop of DC/DC converter, use the gain phase analyzer or FRA to measure the frequency characteristics. rA <Reference> Measurement of open loop of DC/DC converter The heat loss W of the IC can be obtained by the formula shown below: W=Ron X Io2 X + VIN X ICC + Tr X VIN X Io X f Ron: ON resistance of IC (refer to pages 4 and 5.) Io: Load current Vo: Output voltage VIN: Input voltage Icc: Circuit current (Refer to pages 2 and 3) Tr: Switching rise/fall time (Approximately 40 nsec) f : Oscillation frequency Vo VIN 1Ron X Io2 22 X =Tr X VIN X Io X f X Tr X X VIN X Io 2 1 T 1 1 Tr VIN GND SW waveform T = f 1 2 VO Vm + RL ~ DC/DC converter controller Load Output voltage Maximum load t Adequate phase margin Inadequate phase margin 0 ºC ºC 2010.02 - Rev. B www.rohm.com © 2010 ROHM Co., Ltd. All rights reserved. BD9778F, BD9778HFP, BD9001F, BD9781HFP |
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