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LM2700 Datasheet(PDF) 10 Page - Texas Instruments |
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LM2700 Datasheet(HTML) 10 Page - Texas Instruments |
10 / 26 page Hz 1 2S(RC + RO)CC fPC = Hz 1 fZC = 2SRCCC LM2700 SNVS152C – MAY 2001 – REVISED MARCH 2013 www.ti.com INTRODUCTION TO COMPENSATION Figure 18. (a) Inductor current. (b) Diode current. The LM2700 is a current mode PWM boost converter. The signal flow of this control scheme has two feedback loops, one that senses switch current and one that senses output voltage. To keep a current programmed control converter stable above duty cycles of 50%, the inductor must meet certain criteria. The inductor, along with input and output voltage, will determine the slope of the current through the inductor (see Figure 18(a)). If the slope of the inductor current is too great, the circuit will be unstable above duty cycles of 50%. A 4.7µH inductor is recommended for most 600 kHz applications, while a 2.2µH inductor may be used for most 1.25 MHz applications. If the duty cycle is approaching the maximum of 85%, it may be necessary to increase the inductance by as much as 2X. See Inductor and Diode Selection for more detailed inductor sizing. The LM2700 provides a compensation pin (VC) to customize the voltage loop feedback. It is recommended that a series combination of RC and CC be used for the compensation network, as shown in Figure 19. For any given application, there exists a unique combination of RC and CC that will optimize the performance of the LM2700 circuit in terms of its transient response. The series combination of RC and CC introduces a pole-zero pair according to the following equations: (3) (4) 10 Submit Documentation Feedback Copyright © 2001–2013, Texas Instruments Incorporated Product Folder Links: LM2700 |
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