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LM2611AMF 데이터시트 PDF




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부품번호 LM2611AMF 기능
기능 1.4MHz Cuk Converter
제조업체 National Semiconductor
로고 National Semiconductor 로고


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LM2611AMF 데이터시트, 핀배열, 회로
January 2002
LM2611
1.4MHz Cuk Converter
General Description
The LM2611 is a current mode, PWM inverting switching
regulator. Operating from a 2.7 - 14V supply, it is capable of
producing a regulated negative output voltage of up to
−(36-VIN(MAX)). The LM2611 utilizes an input and output
inductor, which enables low voltage ripple and RMS current
on both the input and the output. With a switching frequency
of 1.4MHz, the inductors and output capacitor can be physi-
cally small and low cost. High efficiency is achieved through
the use of a low RDS(ON) FET.
The LM2611 features a shutdown pin, which can be acti-
vated when the part is not needed to lower the Iq and save
battery life. A negative feedback (NFB) pin provides a simple
method of setting the output voltage, using just two resistors.
Cycle-by-cycle current limiting and internal compensation
further simplify the use of the LM2611.
The LM2611 is available is a small SOT23-5 package. It
comes in two grades:
Current Limit
RDS(ON)
Grade A
1.2A
0.5
Grade B
0.9A
0.7
Features
n 1.4MHz switching frequency
n Low RDS(ON) DMOS FET
n 1mVp-p output ripple
n −5V at 300mA from 5V input
n Better regulation than a charge pump
n Uses tiny capacitors and inductors
n Wide input range: 2.7V to 14V
n Low shutdown current: <1uA
n 5-lead SOT-23 package
Applications
n MR Head Bias
n Digital camera CCD bias
n LCD bias
n GaAs FET bias
n Positive to negative conversion
Typical Application Circuit
© 2002 National Semiconductor Corporation DS200181
20018117
www.national.com




LM2611AMF pdf, 반도체, 판매, 대치품
Typical Performance Characteristics
RDS(ON) vs VIN
RDS(ON) Vs. Ambient Temperature
VIN = 5V
20018112
Switch Current Limit vs. VIN
20018145
Switch Current Limit vs Ambient Temperature
VIN = 5V
20018111
Oscillator Frequency vs VIN
20018143
Oscillator Frequency vs Ambient Temperature
VIN = 5V
www.national.com
20018119
4
20018116

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LM2611AMF 전자부품, 판매, 대치품
Operation
Cuk Converter
FIGURE 1. Operating Cycles of a Cuk Converter
20018105
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 CCUK, while the output current is provided by L2.
In the second cycle, L1 charges CCUK and L2 discharges
through the load. By applying the volt-second balance to
either of the inductors, the relationship of VOUT 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, VIN is applied across
L1. In the next cycle, the switch opens and the diode be-
comes forward biased, and VOUT is applied across L1 (the
voltage across CCUK is VIN − VOUT.
20018103
FIGURE 2. Voltage and Current Waveforms in Inductor
L1 of a Cuk Converter
The voltage and current waveforms of inductor L2 are shown
in Figure 3. During the first cycle of operation, when the
switch is closed, VIN is applied across L2. When the switch
opens, VOUT is applied across L2.
20018104
FIGURE 3. Voltage and Current Waveforms in Inductor
L2 of a Cuk Converter
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