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LM2611 bảng dữ liệu(PDF) 8 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
tên linh kiện LM2611
Giải thích chi tiết về linh kiện  1.4MHz Cuk Converter
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nhà sản xuất  NSC [National Semiconductor (TI)]
Trang chủ  http://www.national.com
Logo NSC - National Semiconductor (TI)

LM2611 bảng dữ liệu(HTML) 8 Page - National Semiconductor (TI)

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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
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