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SI4436DY 数据表(PDF) 4 Page - Intersil Corporation |
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SI4436DY 数据表(HTML) 4 Page - Intersil Corporation |
4 / 10 page Application Note 1612 4 AN1612.1 November 28, 2011 CE = Equivalent capacitor reflected to the auxiliary output. ESR = Equivalent series resistance of the output capacitor. K = ISPK(MAX)/VC(MAX). The equivalent load reflected to the auxiliary output can be estimated from: The equivalent capacitor reflected to the auxiliary output can be estimated from: The value of ISPK(MAX) can be determined by assuming that the auxiliary output delivers all of the output power. POUT(MAX) = The maximum power allowed = 4W VC(MAX) has value of 1.1V, clamped by ISL6844’s internal circuit. Along with the result from Equation 22, K has a value of 0.97. Replaces K and the results from Equation 21 and Equation 22 into Equation 19, yields Note that with the low ESR values of the output ceramic capacitor, the zero due to their ESR is located at the frequency significantly higher than the switching frequency. As the result, the impact of capacitor’s ESR is neglected for compensator design. From Equation 20, it shows that when the total output power reduces, the equivalent load resistor increases. This increases the DC-gain in Equation 19, also the pole is moved to the lower frequency. From Equation 23, the pole of the control-to-output transfer function for 3W output is located at 202Hz. Setting the closed-loop’s bandwidth of 10kHz, the feedback compensation must have a mid-band gain of 3.11 (10dB). The mid-band gain is determined by Therefore, R24 is selected to be 16.2kΩ. The first zero of compensation is set at 1/3 of the crossover frequency, 3.33kHz. C9 can be calculated from: 2.7nF is used for C9. The second zero of compensation is set at half of the switching frequency. C10 can be calculated from: 68pF is used for C10. R E V aux 2 P OUT Total () ---------------------------------- = (EQ. 20) 15V () 2 3W ------------------- 75 Ω = = C E C aux N S1 N aux ------------- C ⋅ OUT1 N S2 N aux ------------- C ⋅ OUT2 ++ = (EQ. 21) 1 μF 15 15 ------ 10 μF ⋅ 15 15 ------ 10 μF ⋅ ++ 21 μF = = I SPK MAX () 2 P OUT MAX () V AUX -------------------------------- ⋅ D 2 ----------------------------------------- = (EQ. 22) 2 4W 15V ----------- ⋅ 0.5 ------------------- 1.067A = = G vc 15.87 1 1 s 7.875 4 – ×10 ⋅ + () ---------------------------------------------------- ⋅ = (EQ. 23 FIGURE 3. GAIN OF GVC 10 100 1 .10 3 1 .10 4 1 .10 5 1 .10 6 40 20 0 20 40 FREQUENCY (Hz) 3W TOTAL OUTPUT 1W TOTAL OUTPUT A mid band – R 24 R 22 ---------- = (EQ. 24) C 9 1 2 π 3.33 3 ×10 16.2 3 ×10 ⋅⋅ ⋅ -------------------------------------------------------------------- = (EQ. 25) 2.95nF = C 10 1 2 π 150 3 ×10 16.2 3 ×10 ⋅⋅ ⋅ ------------------------------------------------------------------- = (EQ. 26) 65.5pF = |
类似零件编号 - SI4436DY |
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类似说明 - SI4436DY |
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