전자부품 데이터시트 검색엔진 |
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LM2611AMF 데이터시트(PDF) 8 Page - National Semiconductor (TI) |
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LM2611AMF 데이터시트(HTML) 8 Page - National Semiconductor (TI) |
8 / 15 page Operation (Continued) (1) (2) The optimal position for this zero-pole pair will vary with circuit parameters such as D, I OUT,COUT, L1, L2, and CCUK. For most cases, the value for the zero frequency is between 5 kHz to 20 kHz. Notice how the pole position, ω p, is depen- dant on the feedback resistors R FB1 and RFB2, and therefore also dependant on the output voltage. As the output voltage becomes closer to −1.26V, the pole moves towards the zero, tending to cancel it out. If the absolute magnitude of the output voltage is less than 3.3V, adding the zero-pole pair will not have much effect on the response. Hysteretic Mode As the output current decreases, there will come a point when the energy stored in the Cuk capacitor is more than the energy required by the load. The excess energy is absorbed by the output capacitor, causing the output voltage to in- crease out of regulation. The LM2611 detects when this happens and enters a pulse skipping, or hysteretic mode. In hysteretic mode, the output voltage ripple will increase, as illustrated in Figure 7 and Figure 8. 20018120 ) LEVEL 3 FIGURE 5. 130mA to 400mA Transient Response of the circuit in Figure 9 with C FF= 1nF 20018122 ) LEVEL 3 FIGURE 6. 130mA to 400mA Transient Response of the circuit in Figure 9 with C FF disconnected 20018121 FIGURE 7. The LM2611 in PWM mode has very low ripple www.national.com 8 |
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