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BD8312HFN Datasheet(PDF) 11 Page - Rohm |
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BD8312HFN Datasheet(HTML) 11 Page - Rohm |
11 / 15 page BD8312HFN Technical Note 11/14 www.rohm.com 2010.06- Rev.C © 2010 ROHM Co., Ltd. All rights reserved. [2] Cs and Rs setting For DC/DC converter, the 2nd dimension pole point is caused by the coil and capacitor as expressed by the following equation. fLC= This secondary pole causes a phase rotation of 180°. To secure the stability of the system, put a zero point in 2 places to perform compensation. Zero point by built-in CR fZ1= = 13kHz Zero point by Cs fZ1= Setting fZ2 to be half to 2 times a frequency as large as fLC provides an appropriate phase margin. It is desirable to set Rs at about 1/20 of (R1+R3) to cancel any phase boosting at high frequencies. Those pole points are summarized in the figure below. The actual frequency property is different from the ideal calculation because of part constants. If possible, check the phase margin with a frequency analyzer or network analyzer. Otherwise, check for the presence or absence of ringing by load response waveform and also check for the presence or absence of oscillation under a load of an adequate margin. 2π√(LC) 1 ・・・・ (4) 2πR4C2 2π(R1+R3)CS 1 (5) ・・・・ (5) ・・・・ (6) (6) (4) (3) 1 Fig.35 Example of DC/DC converter frequency property ( Measured with FRA5097 by NF Corporation) |
Similar Part No. - BD8312HFN_10 |
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Similar Description - BD8312HFN_10 |
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