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NX2117ACUTR Datasheet(PDF) 10 Page - Microsemi Corporation |
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NX2117ACUTR Datasheet(HTML) 10 Page - Microsemi Corporation |
10 / 14 page NX2116/2116A/2116B/2117/2117A 10 Rev. 3.0 03/14/06 Case 2: F LC<FESR<FO 40dB/decade 20dB/decade loop gain LC F ESR F compensator power stage FZ1 Z2 F O F FP2 P1 F Figure 5 - Bode plot of Type III compensator (F LC<FESR<FO) If electrolytic capacitors are used as output capacitors, typical design example of type III compensator in which the crossover frequency is selected as F LC<FESR<FO and FO<=1/10~1/5Fs is shown as the following steps. Here two SANYO MV-WG1500 with 13 m Ω is chosen as output capacitor. 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 3000uF 2.9kHz = ×π ×× = ×π ×× = ESR OUT 1 F 2 ESRC 1 2 6.5m 3000uF 8.2kHz = ×π ×× = ×π × Ω× = 2. Set R 2 equal to 10kΩ. × Ω× = =Ω 2 REF 1 OUT REF RV 10k 0.8V R = 8k V -V 1.8V-0.8V Choose R 1=8kΩ. 3. Set zero F Z2 = FLC and Fp1 =FESR . 4. Calculate C 3 . 3 2 z2 p1 1 11 C = (-) 2 R FF 1 11 = (-) 2 10k 2.9kHz 8.2kHz =3.5nF × ×π× × ×π ×Ω Choose C 3=3.3nF. 5. Calculate R 3 . 3 P13 1 R 2 FC 1 2 8.2kHz 3.3nF 5.9k = ×π ×× = ×π ×× =Ω Choose R 3 =5.9kΩ. 6. Calculate R 4 with FO=60kHz. OSC O 23 4 in 23 V2 F L RR R= V ESR RR 1.5V 2 60kHz 1uH 10k 5.9k = 12V 6.5m 10k 5.9k =26.9k ×π × ×× ×× + ×π × × Ω ×Ω ×× Ω Ω +Ω Ω Choose R 4=26.7kΩ. 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 2.9kHz 26.7k 2nF = ×π ×× = ×π × × ×Ω = Choose C 2=2.2nF. 6. Calculate C 1 by equation (14) with pole Fp2 at half the switching frequency. 1 4 P2 1 C 2 RF 1 2 26.7k 300kHz 20pF = ×π ×× = ×π × Ω× = Choose C 1=22pF. |
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