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LM2611AMFX データシート(PDF) 9 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
部品番号 LM2611AMFX
部品情報  1.4MHz Cuk Converter
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メーカー  NSC [National Semiconductor (TI)]
ホームページ  http://www.national.com
Logo NSC - National Semiconductor (TI)

LM2611AMFX データシート(HTML) 9 Page - National Semiconductor (TI)

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Operation (Continued)
A general rule of thumb is to keep f
ESR > 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 capaci-
tor and could place f
ESR 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, C
FF, in par-
allel to the top feedback resistor (R
FB1). 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 6 and Figure 7). The position of the
zero-pole pair is a function of the feedback resistors and the
capacitor value:
(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, placing the zero at 34 krad/s (5.4 kHz) is
effective (this corresponds to the values on the front page
schematic). Notice how the pole position,
ω
p, is dependant
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.
Hysteric 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 8 and Figure 9.
20018120
) LEVEL 3
FIGURE 6. 130mA to 400mA Transient Response
of the circuit in
Figure 10 with C
FF= 1nF
20018122
) LEVEL 3
FIGURE 7. 130mA to 400mA Transient Response
of the circuit in
Figure 10 with C
FF disconnected
20018121
FIGURE 8. The LM2611 in PWM mode has very low
ripple
www.national.com
9


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