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APU3048 Datasheet(PDF) 9 Page - Advanced Power Electronics Corp. |
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APU3048 Datasheet(HTML) 9 Page - Advanced Power Electronics Corp. |
9 / 16 page Advanced Power Electronics Corp. APU3048 9 As known, transconductance amplifier has high impedance (current source) output, therefore, consider should be taken when loading the E/A output. It may exceed its source/sink output current capability, so that the amplifier will not be able to swing its output voltage over the necessary range. The compensation network has three poles and two zeros and they are expressed as follows: FLC1 = 2.8KHz R8 = 1K R6 = 1.64K gm = 600umho For: VIN1 = 12V VOSC = 1.25V FO1 = 30KHz FESR1 = 26.5KHz This results to R9=46.4KΩ; Choose R9=46.4KΩ To cancel one of the LC filter poles, place the zero be-fore the LC filter resonant frequency pole: For: L3 = 10.2uH Co = 300uF Fz = 2.1KHz R9 = 46.4KΩ Using equations (11) and (13) to calculate C9, we get: C9 = 1630pF; Choose C9 = 1800pF We get: R11 = 38.9KΩ; Choose R11 = 39.2KΩ C19 = 1554pF; Choose C19 = 1800pF One more capacitor is sometimes added in parallel with C9 and R4. This introduces one more pole which is mainly used to supress the switching noise. The additional pole is given by: The pole sets to one half of switching frequency which results in the capacitor CPOLE: For a general solution for unconditionally stability for any type of output capacitors, in a wide range of ESR values we should implement local feedback with a compensation network. The typically used compensation network for voltage-mode controller is shown in Figure 7. Figure 7 - Compensation network with local feedback and its asymptotic gain plot. In such configuration, the transfer function is given by: The error amplifier gain is independent of the transconductance under the following condition: By replacing ZIN and Zf according to figure 7, the transformer function can be expressed as: . |
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