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LM2611 数据表(PDF) 8 Page - Texas Instruments |
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LM2611 数据表(HTML) 8 Page - Texas Instruments |
8 / 22 page + 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 Submit Documentation Feedback Copyright © 2001–2015, Texas Instruments Incorporated Product Folder Links: LM2611 |
类似零件编号 - LM2611 |
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类似说明 - LM2611 |
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