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IRU3047 Datasheet(PDF) 11 Page - International Rectifier |
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IRU3047 Datasheet(HTML) 11 Page - International Rectifier |
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11 / 19 page  IRU3047 11 Rev. 1.0 09/09/02 www.irf.com FP3 = fS 2 4) Place third pole at the half of the switching frequency. C12 > 50pF If not, change R7 selection. 5) Place R7 in equation (16) and calculate C10: 6) Place second pole at ESR zero. FP2 = FESR Check if R8 > If R8 is too small, increase R7 and start from step 2. 7) Place second zero around the resonant frequency. FZ2 = FLC 8) Use equation (1) to calculate R5: These design rules will give a crossover frequency ap- proximately one-tenth of the switching frequency. The higher the band width, the potentially faster the load tran- sient speed. The gain margin will be large enough to provide high DC-regulation accuracy (typically -5dB to - 12dB). The phase margin should be greater than 45 8 for overall stability. The slave error amplifier is a differential-input transcon- ductance amplifier as well, the main goal for the slave feed back loop is to control the inductor current to match the masters inductor current as well provides highest bandwidth and adequate phase margin for overall stabil- ity. 1 gm The transfer function of power stage is expressed by: As shown the transfer function is a function of inductor current. The transfer function for the compensation network is given by equation (18), when using a series RC circuit as shown in Figure 8. Figure 8 - The PI compensation network for slave channel. The loop gain function is: Select a zero crossover frequency (FO2) one-tenth of the switching frequency: FO2 = 20KHz Where: VIN = Input Voltage VOUT = Output Voltage L2 = Output Inductor VOSC = Oscillator Peak Voltage C12 = 1 2 p 3 R7 3 FP3 C10 [ 3 2 p 3 Lo 3 FO 3 Co R7 VOSC VIN R8 = 1 2 p 3 C10 3 FP2 R6 = - R8 1 2 p 3 C10 3 FZ2 R5 = 3 R6 VREF VOUT - VREF L2 L1 C2 R2 RS2 RS1 Ve IL2 IL1 E/A2 Fb2 Comp2 Vp2 FO2 = fS 10 G(s) = = ---(17) IL2(s) Ve(s) VIN - VOUT sL2 3 VOSC D(s)= = gm 3 3 ---(18) ( ) ( ) Ve(s) RS2 3 IL2(s) RS1 RS2 1 + sC2R2 sC2 H(s)=[G(s) 3D(s)3RS2] 3 H(s)=RS2 3 ( ) RS1 RS2 gm 3 VIN-VOUT sL2 3VOSC ( ) 1+sR2C2 sC2 ( )3 |
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