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LM2611 数据表(PDF) 8 Page - Texas Instruments

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部件名 LM2611
功能描述  Cuk Converter
Download  22 Pages
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制造商  TI1 [Texas Instruments]
网页  http://www.ti.com
标志 TI1 - Texas Instruments

LM2611 数据表(HTML) 8 Page - Texas Instruments

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+ L1 -
- L2 +
+ L1 -
- L2 +
VIN
VIN
COUT
COUT
VOUT
+ CCUK -
+
-
VOUT
+ CCUK -
+
-
a
b
PWM COMPARATOR
¦
Q1
Q2
x10
R3
30k
R4
140k
R5
R6
RC
CC
RAMP
GENERATOR
1.4MHz
OSCILLATOR
Q
R
s
R
0.05
CURRENT LIMIT
COMPARATOR
DRIVER
+
-
gm
-
+
R1
EXTERNAL
R2
EXTERNAL
CFF
(OPTIONAL)
1 SW
2 GND
5
3 NFB
4
VI
N
SHDN
SHUTDOWN
FF
VO
R
THERMAL
SHUTDOWN
LM2611
SNOS965J – JUNE 2001 – REVISED DECEMBER 2015
www.ti.com
7 Detailed Description
7.1 Overview
The LM2611 consists of a current mode controller with an integrated primary switch and integrated current
sensing circuitry. The feedback is connected to the internal error amplifier and a type II/III internal compensation
scheme is used. A ramp generator provides some slope compensation to the system. SHDN pin is a logic input
designed to shut down the converter.
7.2 Functional Block Diagram
7.3 Feature Description
7.3.1 Cuk Converter
Figure 13. Operating Cycles of a Cuk Converter
The LM2611 is a current mode, fixed frequency PWM switching regulator with a
−1.23-V 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 converter produces very little input and output
current ripple. This is a significant advantage over other inverting topologies such as the buck-boost and flyback.
The operating states of the Cuk converter are shown in Figure 13. 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, use Equation 1 to determine the relationship of VOUT to the duty cycle
(D).
8
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Copyright © 2001–2015, Texas Instruments Incorporated
Product Folder Links: LM2611


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