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BD9486F 데이터시트(PDF) 22 Page - Rohm |
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BD9486F 데이터시트(HTML) 22 Page - Rohm |
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22 / 38 page ![]() Datasheet Datasheet 22/34 TSZ02201-0F1F0C100240-1-2 © 2013 ROHM Co., Ltd. All rights reserved. 15.Feb.2016 Rev.006 www.rohm.com TSZ22111・15・001 BD9486F ●3.4.Loop Compensation A current mode DCDC converter has each one pole (phase lag) fp due to CR filter composed of the output capacitor and the output resistance (= LED current) and zero (phase lead) fZ by the output capacitor and the ESR of the capacitor. Moreover, a step-up DCDC converter has RHP zero (right-half plane zero point) fZRHP which is unique with the boost converter. This zero may cause the unstable feedback. To avoid this by RHP zero, the loop compensation that the cross-over frequency fc, set as follows, is suggested. fc = fZRHP /5 (fZRHP: RHP zero frequency) Considering the response speed, the calculated constant below is not always optimized completely. It needs to be adequately verified with an actual device. Figure 31. Output stage and error amplifier diagram i. Calculate the pole frequency fp and the RHP zero frequency fZRHP of DC/DC converter Where ILED = the summation of LED current, (Continuous Current Mode) ii. Calculate the phase compensation of the error amp output (fc = fZRHP/5) Above equation is described for lighting LED without the oscillation. The value may cause much error if the quick response for the abrupt change of dimming signal is required. To improve the transient response, RFB1 needs to be increased, and CFB1 needs to be decreased. It needs to be adequately verified with an actual device in consideration of variation from parts to parts since phase margin is decreased. ] Hz [ I L ) D ( V f LED OUT ZRHP 2 1 2 ] [ ) D ( V gm f I R f R OUT p LED CS RHZP FB 1 5 1 ] Hz [ C V I f OUT OUT LED p 2 OUT IN OUT V V V D ] S [ . gm 4 10 0 4 ] F [ ZRHP f 1 FB R π 2 5 c f 1 FB R π 2 1 1 FB C |
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