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LM2611AMF Datenblatt(PDF) 6 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor. Click here to check the latest version.
Teilenummer LM2611AMF
Bauteilbeschribung  1.4MHz Cuk Converter
Download  15 Pages
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Hersteller  NSC [National Semiconductor (TI)]
Direct Link  http://www.national.com
Logo NSC - National Semiconductor (TI)

LM2611AMF Datenblatt(HTML) 6 Page - National Semiconductor (TI)

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Operation
Cuk Converter
The LM2611 is a current mode, fixed frequency PWM
switching regulator with a −1.23V reference that makes it
ideal for use in a Cuk converter. The Cuk converter inverts
the input and can step up or step down the absolute value.
Using inductors on both the input and output, the Cuk con-
verter produces very little input and output current ripple.
This is a significant advantage over other inverting topolo-
gies such as the buck-boost and flyback.
The operating states of the Cuk converter are shown in
Figure 1. During the first cycle, the transistor switch is closed
and the diode is open. L1 is charged by the source and L2 is
charged by C
CUK, while the output current is provided by L2.
In the second cycle, L1 charges C
CUK and L2 discharges
through the load. By applying the volt-second balance to
either of the inductors, the relationship of V
OUT to the duty
cycle (D) is found to be:
The following sections review the steady-state design of the
LM2611 Cuk converter.
Output and Input Inductor
Figure 2 and Figure 3 show the steady-state voltage and
current waveforms for L1 and L2, respectively. Referring to
Figure 1 (a), when the switch is closed, V
IN is applied across
L1. In the next cycle, the switch opens and the diode be-
comes forward biased, and V
OUT is applied across L1 (the
voltage across C
CUK is VIN −VOUT.
The voltage and current waveforms of inductor L2 are shown
in Figure 3. During the first cycle of operation, when the
switch is closed, V
IN is applied across L2. When the switch
opens, V
OUT is applied across L2.
20018105
FIGURE 1. Operating Cycles of a Cuk Converter
20018103
FIGURE 2. Voltage and Current Waveforms in Inductor
L1 of a Cuk Converter
20018104
FIGURE 3. Voltage and Current Waveforms in Inductor
L2 of a Cuk Converter
www.national.com
6


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