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LT3467AEDDB Datasheet(PDF) 10 Page - Linear Integrated Systems |
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LT3467AEDDB Datasheet(HTML) 10 Page - Linear Integrated Systems |
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10 / 18 page  LT3467/LT3467A 10 3467afe APPLICATIONS INFORMATION Compensation—Theory Like all other current mode switching regulators, the LT3467/LT3467A needs to be compensated for stable and efficient operation. Two feedback loops are used in the LT3467/LT3467A: a fast current loop which does not require compensation, and a slower voltage loop which does. Standard Bode plot analysis can be used to under- stand and adjust the voltage feedback loop. As with any feedback loop, identifying the gain and phase contribution of the various elements in the loop is critical. Figure 6 shows the key equivalent elements of a boost converter. Because of the fast current control loop, the power stage of the IC, inductor and diode have been re- placed by the equivalent transconductance amplifier gmp. gmp acts as a current source where the output current is proportional to the VC voltage. Note that the maximum output current of gmp is finite due to the current limit in the IC. From Figure 6, the DC gain, poles and zeroes can be calculated as follows: Output Pole: P1= 2 2• π •RL •COUT Error Amp Pole: P2= 1 2• π •RO •CC Error Amp Zero: Z1= 1 2• π •RC •CC DC GAIN: A= 1.255 VOUT 2 •VIN •gma •RO •gmp •RL • 1 2 ESR Zero: Z2 = 1 2• π •RESR •COUT RHP Zero: Z3= VIN 2 •R L 2• π •VOUT 2 •L High Frequency Pole: P3> fS 3 Phase Lead Zero: Z4 = 1 2• π •R1•CPL Phase Lead Pole: P4 = 1 2• π •CPL • R1•R2 R1 +R2 The current mode zero is a right-half plane zero which can be an issue in feedback control design, but is manageable with proper external component selection. – + gma RC RO R2 CC: COMPENSATION CAPACITOR COUT: OUTPUT CAPACITOR CPL: PHASE LEAD CAPACITOR gma: TRANSCONDUCTANCE AMPLIFIER INSIDE IC gmp: POWER STAGE TRANSCONDUCTANCE AMPLIFIER RC: COMPENSATION RESISTOR RL: OUTPUT RESISTANCE DEFINED AS VOUT DIVIDED BY ILOAD(MAX) RO: OUTPUT RESISTANCE OF gma R1, R2: FEEDBACK RESISTOR DIVIDER NETWORK RESR: OUTPUT CAPACITOR ESR 3467 F06 R1 COUT CPL RL RESR VOUT VC CC gmp 1.255V REFERENCE Figure 6. Boost Converter Equivalent Model |
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