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전자부품 데이터시트 검색엔진 |
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전자부품 데이터시트 검색엔진 |
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AN2870 데이터시트(PDF) 30 Page - STMicroelectronics |
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AN2870 데이터시트(HTML) 30 Page - STMicroelectronics |
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30 / 41 page  Designing with L6585DE AN2870 30/41 Equation 35 An example of characteristic curves is reported in Figure 15-A and B Ballast inductor experiences the maximum current during ignition, when the operating point is very close to the resonance frequency. Equation 36 Rhbcs must be chosen in order to obtain the minimum ignition voltage across the lamp: Equation 37 Rhbcs power rating can be calculated considering the RMS value of the low side current during ignition. In this case the bias point lies at a frequency close to the resonance frequency, therefore the current flowing in resonant network is almost sinusoidal. This allows the designer to approximate the RMS current to: 2 0 run 2 2 0 run 2 0 pk , bal run f f f f 1 Q Z V I ⎟⎟ ⎠ ⎞ ⎜⎜ ⎝ ⎛ + ⎟ ⎟ ⎠ ⎞ ⎜ ⎜ ⎝ ⎛ ⎟⎟ ⎠ ⎞ ⎜⎜ ⎝ ⎛ − = Figure 15. (A) voltage frequency response Figure 15. (B) current frequency response ⎟⎟ ⎟ ⎟ ⎟ ⎟ ⎟ ⎟ ⎠ ⎞ ⎜⎜ ⎜ ⎜ ⎜ ⎜ ⎜ ⎜ ⎝ ⎛ ⎟⎟ ⎠ ⎞ ⎜⎜ ⎝ ⎛ + ⎥ ⎥ ⎦ ⎤ ⎢ ⎢ ⎣ ⎡ ⎟⎟ ⎠ ⎞ ⎜⎜ ⎝ ⎛ − ⎟⎟ ⎠ ⎞ ⎜⎜ ⎝ ⎛ + = 2 0 ign 2 2 0 ign 2 0 ign 0 pk , bal ign , ballast f f f f 1 Q f f Q 1 Z V I ign , ballast hbcsh HBCS I V R = |
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