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LM2611BMF датащи(PDF) 8 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
номер детали LM2611BMF
подробное описание детали  1.4MHz Cuk Converter
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производитель  NSC [National Semiconductor (TI)]
домашняя страница  http://www.national.com
Logo NSC - National Semiconductor (TI)

LM2611BMF датащи(HTML) 8 Page - National Semiconductor (TI)

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Operation (Continued)
The following equations define values given in
Figure 2 and
Figure 3:
I
L2 =IOUT
Use these equations to choose correct core sizes for the
inductors. The design of the LM2611’s internal compensa-
tion assumes L1 and L2 are equal to 10 - 22 µH, thus it is
recommended to stay within this range.
Switch Current Limit
The LM2611 incorporates a separate current limit compara-
tor, making current limit independent of any other variables.
The current limit comparator measures the switch current
versus a reference that represents current limit. If at any time
the switch current surpasses the current limit, the switch
opens until the next switching period. To determine the maxi-
mum load for a given set of conditions, both the input and
output inductor currents must be considered. The switch
current is equal to i
L1 +iL2, and is drawn in Figure 4.In
summary:
i
SW(PEAK) must be less than the current limit (1.2A typical),
but will also be limited by the thermal resistivity of the
LM2611’s SOT23-5 package (
θ
JA
= 265˚C/W).
Figure 5
shows the maximum output current vs. input voltage that can
be expected from a typical layout using 1oz. copper (no
heatsink or fan), it is limited by thermal shutdown rather than
current limit.
Input Capacitor
The input current waveform to a Cuk converter is continuous
and triangular, as shown in
Figure 2. The input inductor
insures that the input capacitor sees fairly low ripple cur-
rents. However, as the input inductor gets smaller, the input
ripple goes up. The RMS current in the input capacitor is
given by:
The input capacitor should be capable of handling the RMS
current. Although the input capacitor is not so critical in a Cuk
converter, a 10µF or higher value good quality capacitor
prevents any impedance interactions with the input supply. A
0.1µF or 1µF ceramic bypass capacitor is also recom-
mended on the V
IN pin (pin 5) of the IC. This capacitor must
be connected very close to pin 5 (within 0.2 inches).
Output Capacitor
Like the input current, the output current is also continuous,
triangular, and has low ripple (see I
L2 in Figure 3). The output
capacitor must be rated to handle its RMS current:
For example, I
COUT(RMS) can range from 30mA to 180mA
with 10µH
≤ L
1,2 ≤ 22µH, −10V ≤ VOUT ≤ −3.3V, and 2.7V ≤
V
IN ≤ 30V (VIN may be 30V if using separate power and
analog supplies, see Split Supply Operation in the APPLI-
CATIONS section). The worst case conditions are with L
1,2,
V
OUT(MAX), and VIN(MAX). Many capacitor technologies will
provide this level of RMS current, but ceramic capacitors are
ideally suited for the LM2611. Ceramic capacitors provide a
good combination of capacitance and equivalent series re-
sistance (ESR) to keep the zero formed by the capacitance
and ESR at high frequencies. The ESR zero is calculated as:
20018102
FIGURE 4. Switch Current Waveform in a Cuk
Converter. The peak value is equal to the sum of the
average currents through L1 and L2 and the
average-to-peak current ripples through L1 and L2.
20018126
) LEVEL 3
FIGURE 5. I
OUT(MAX) vs VIN using 1oz. copper layout.
See
Figure 14 for the test circuit.
www.national.com
8


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