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IP1202 Datasheet(PDF) 20 Page - International Rectifier |
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IP1202 Datasheet(HTML) 20 Page - International Rectifier |
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20 / 29 page  www.irf.com 20 iP1202 R 9 10 Vref Vo - Vref More than one iteration may be required to calculate the values of the compensation components if cross- over frequencies higher than the range specified in step 1 are required (for higher bandwidths and faster transient response performance). To ensure stability a phase margin greater than 45° shouldbe achieved. Refer to AN-1043 for more detailed compensation techniques using Transconductance Amplifiers. Compensation in Current Share Mode The iP1202 can be configured in single output paral- leled configuration. The feedback loop of the first out- put is closed around the output voltage, and the sec- ond amplifier, which is also a transconductance one, forces equal sharing of the inductor currents in both outputs. Voltage Loop Type II and Type III methods of voltage loop com- pensation discussed above, can be used to com- pensate the voltage loop of a single output iP1202. In this case, the total amount of capacitance seen by both channels and the inductance of the voltage controlling channel should be considered for com- pensation. Current Loop Use the following procedure for current loop com- pensation: In Fig. 20, L 1 and L2 are the inductors for outputs 1 and 2 respectively. Rsh1 and Rsh2 are the current sensing shunts for the same outputs. 7. Place the second pole f p2 at or near fesr of the out- put capacitor C o and determine the value of R24 from equation (20). Make sure R 24 < 8. Use equation (25) to calculate R 7. R 7 = R9 x (25) The crossover frequency f 0 for type III compensation is represented by equation (24): (24) Follow the steps below to determine the feedback loop compensation component values: 1. Select a zero db crossover frequency f 0 in the range of 10% to 20% of the switching frequency f sw. 2. Select R 23~ 10kΩ 3. Place the first zero f z1 at 75% of the resonant fre- quency f LC of the output filter. Determine C 9 from equation (22). 4. Place a third pole f P3 at or near the switching fre- quency f SW. Select C18 such that C 18 < 5. Calculate C 19 from equation (24). 6. Place the second zero at 125% of the resonant frequency f LC of the output filter. Calculate R9 using equation (23). 0 0 19 23 0 2 1 8 . 0 C L C R V f IN × × × × × × = π 1 V ramp 10 9 C The frequencies of the three poles and the two zeros of the type III compensation scheme are represented by the following equations: f p1= 0 (19) (20) 19 24 2 2 1 C R f p × × = π (22) (21) (23) 18 23 3 2 1 C R f p × × ≅ π 9 23 1 2 1 C R f z × × = π 19 9 2 2 1 C R f z × × = π |
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Similar Description - IP1202 |
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