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LM2611 데이터시트(PDF) 9 Page - Texas Instruments

부품명 LM2611
상세설명  LM2611 1.4MHz Cuk Converter
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LM2611 데이터시트(HTML) 9 Page - Texas Instruments

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Zp =
1
CFFRFB1(
1+
RFB2
RFB1
(rad/s)
Zz =
1
CFFRFB1
(rad/s)
LM2611
www.ti.com
SNOS965I – JUNE 2001 – REVISED APRIL 2013
A general rule of thumb is to keep fESR > 80kHz for LM2611 Cuk designs. Low ESR tantalum capacitors will
usually be rated for at least 180mA in a voltage rating of 10V or above. However the ESR in a tantalum capacitor
(even in a low ESR tantalum capacitor) is much higher than in a ceramic capacitor and could place fESR low
enough to cause the LM2611 to run unstable.
Improving Transient Response/Compensation
The compensator in the LM2611 is internal. However, a zero-pole pair can be added to the open loop frequency
response by inserting a feed forward capacitor, CFF, in parallel to the top feedback resistor (RFB1). Phase margin
and bandwidth can be improved with the added zero-pole pair. This inturn will improve the transient response to
a step load change (see Figure 17 and Figure 18). The position of the zero-pole pair is a function of the feedback
resistors and the capacitor value:
(10)
(11)
The optimal position for this zero-pole pair will vary with circuit parameters such as D, IOUT, 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,
ωp, is dependant on the feedback resistors RFB1 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.
Figure 17. 130mA to 400mA Transient Response
Figure 18. 130mA to 400mA Transient Response
of the circuit in 5V to -5V Inverting Converter with
of the circuit in 5V to -5V Inverting Converter with
CFF= 1nF
CFF disconnected
Copyright © 2001–2013, Texas Instruments Incorporated
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