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NX2116B Datasheet(PDF) 9 Page - Microsemi Corporation |
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NX2116B Datasheet(HTML) 9 Page - Microsemi Corporation |
9 / 14 page NX2116/2116A/2116B/2117/2117A 9 Rev. 3.0 03/14/06 Case 1: F LC<FO<FESR 40dB/decade 20dB/decade loop gain LC F ESR F compensator power stage FZ1 Z2 F O F FP2 P1 F Figure 4 - Bode plot of Type III compensator Design example for type III compensator are in order. The crossover frequency has to be selected as F LC<FO<FESR, and FO<=1/10~1/5Fs. 1.Calculate the location of LC double pole F LC and ESR zero F ESR. LC OUT OUT 1 F 2 LC 1 2 1uH 440uF 7.6kHz = ×π ×× = ×π ×× = ESR OUT 1 F 2 ESRC 1 2 6m 440uF 60.3kHz = ×π ×× = ×π × Ω× = 2. Set R 2 equal to 20kΩ. × Ω× = =Ω 2 REF 1 OUT REF RV 20k 0.8V R = 16k V -V 1.8V-0.8V Choose R 1=16kΩ. 3. Set zero F Z2 = FLC and Fp1 =FESR . 4. Calculate R 4 and C3 with the crossover frequency at 1/10~ 1/5 of the switching frequency. Set F O=50kHz. 3 2 z2 p1 1 11 C = (-) 2 R FF 1 11 = ( -) 2 20k 7.6kHz 60.3kHz =916pF × ×π× × ×π×Ω OSCO 4 out in3 V 2 FL R =C VC 1.5V 2 50kHz 1uH = 440uF 12V 1nF =17.2k ×π ×× ×× ×π ×× ×× Ω Choose C 3=1nF, R4=17.4kΩ. 5. Calculate C 2 with zero Fz1 at 75% of the LC double pole by equation (11). 2 Z14 1 C 2 FR 1 2 0.75 7.6kHz 17.4k 1.6nF = ×π ×× = ×π × × ×Ω = Choose C 2=1.5nF. 6. Calculate C 1 by equation (14) with pole Fp2 at half the switching frequency. 1 4 P2 1 C 2 RF 1 2 17.4k 300kHz 30pF = ×π ×× = ×π × Ω× = Choose C 1=33pF 7. Calculate R 3 by equation (13). 3 P13 1 R 2 FC 1 2 60.3kHz 1nF 2.64k = ×π ×× = ×π ×× =Ω Choose R 3=2.61kΩ. |
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