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LM2611 Datasheet(PDF) 6 Page - Texas Instruments |
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LM2611 Datasheet(HTML) 6 Page - Texas Instruments |
6 / 24 page VOUT = -VIN 1-D D + 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 VIN SHDN SHUTDOWN FF VO R THERMAL SHUTDOWN LM2611 SNOS965I – JUNE 2001 – REVISED APRIL 2013 www.ti.com Block Diagram Operation Cuk Converter Figure 13. Operating Cycles of a 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 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, the relationship of VOUT to the duty cycle (D) is found to be: (1) The following sections review the steady-state design of the LM2611 Cuk converter. Output and Input Inductor Figure 14 and Figure 15 show the steady-state voltage and current waveforms for L1 and L2, respectively. Referring to Figure 13 (a), when the switch is closed, VIN is applied across L1. In the next cycle, the switch opens and the diode becomes forward biased, and VOUT is applied across L1 (the voltage across CCUK is VIN − VOUT. 6 Submit Documentation Feedback Copyright © 2001–2013, Texas Instruments Incorporated Product Folder Links: LM2611 |
Número de pieza similar - LM2611_15 |
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Descripción similar - LM2611_15 |
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