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BD9486F 데이터시트(PDF) 22 Page - Rohm

부품명 BD9486F
상세설명  1ch Boost up type White LED Driver for large LCD
PDF  38 Pages
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제조업체  ROHM [Rohm]
홈페이지  http://www.rohm.com
Logo ROHM - Rohm

BD9486F 데이터시트(HTML) 22 Page - Rohm

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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.
  
 
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