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LM5575MHX/NOPB bảng dữ liệu(PDF) 10 Page - Texas Instruments |
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LM5575MHX/NOPB bảng dữ liệu(HTML) 10 Page - Texas Instruments |
10 / 30 page SYNC 10k S R Q Q DEADTIME ONE-SHOT 5V 2.5V I = f(RT) SYNC LM5575 UP TO 5 TOTAL DEVICES LM5575 SYNC SYNC AGND LM5575 SW CLK SYNC SW 500 ns LM5575 SNVS471G – JANUARY 2007 – REVISED APRIL 2013 www.ti.com Figure 11. Sync from External Clock Figure 12. Sync from Multiple Devices Multiple LM5575 devices can be synchronized together simply by connecting the SYNC pins together. In this configuration all of the devices will be synchronized to the highest frequency device. The diagram in Figure 13 illustrates the SYNC input/output features of the LM5575. The internal oscillator circuit drives the SYNC pin with a strong pull-down / weak pull-up inverter. When the SYNC pin is pulled low either by the internal oscillator or an external clock, the ramp cycle of the oscillator is terminated and a new oscillator cycle begins. Thus, if the SYNC pins of several LM5575 IC’s are connected together, the IC with the highest internal clock frequency will pull the connected SYNC pins low first and terminate the oscillator ramp cycles of the other IC’s. The LM5575 with the highest programmed clock frequency will serve as the master and control the switching frequency of the all the devices with lower oscillator frequency. Figure 13. Simplified Oscillator Block Diagram and SYNC I/O Circuit 10 Submit Documentation Feedback Copyright © 2007–2013, Texas Instruments Incorporated Product Folder Links: LM5575 |
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