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LMZ21700 Arkusz danych(PDF) 11 Page - Texas Instruments |
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LMZ21700 Arkusz danych(HTML) 11 Page - Texas Instruments |
11 / 37 page CIN 22µF _ 25V X7R or X5R CSS 3300pF _10V X7R or X5R COUT 22µF _ 10V X7R or X5R RPG 10k 1% RFBT 41.2k 1% RFBB 82.5k 1% COMPONENT VALUES FOR VOUT=1.2V VIN EN GND SS LMZ21700 CIN CSS VOUT PG FB VOS COUT RPG RFBT RFBB VIN VOUT LMZ21700 www.ti.com SNVS872C – AUGUST 2012 – REVISED NOVEMBER 2014 8.5 Device Functional Modes 8.5.1 PWM Mode Operation The LMZ21700 operates in PWM mode when the output current is greater than half the inductor ripple current. The frequency variation in PWM mode is controlled and depends on the VIN and VOUT settings. Refer to the Application Curves section for switching frequency graphs for several typical output voltage settings. As the load current is decreased and the valley of the inductor current ripple reaches 0 A the device enters PSM operation to maintain high efficiency. 8.5.2 PSM Operation Once the load current decreases and the valley of the inductor current reaches 0 A, the LMZ21700 will transition to Power Save Mode of operation. The device will remain in PSM as long as the inductor current is discontinuous. The switching frequency will decrease linearly with the load current. If VIN decreases to about 15 % above VOUT the device will not enter PSM and will maintain output regulation in PWM mode. 9 Application and Implementation NOTE Information in the following applications sections is not part of the TI component specification, and TI does not warrant its accuracy or completeness. TI’s customers are responsible for determining suitability of components for their purposes. Customers should validate and test their design implementation to confirm system functionality. 9.1 Application Information The LMZ21700 is a step down DC-to-DC converter. It is used to convert higher DC voltage to a regulated lower DC voltage with maximum load current of 650 mA. The following design procedure can be used to select components for the LMZ21700. Alternatively, the WEBENCH® software can be used to select from a large database of components, run electrical simulations, and optimize the design for specific performance. Please go to webench.ti.com to access the WEBENCH® tool. 9.2 Typical Application For a quick start, the following component values can be used as a design starting point for several typical output voltage rails and 650 mA of output load current. Figure 14. Typical Applications Circuit Figure 15. External Component Values ( VOUT = 1.2 V ) Copyright © 2012–2014, Texas Instruments Incorporated Submit Documentation Feedback 11 Product Folder Links: LMZ21700 |
Podobny numer części - LMZ21700_15 |
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Podobny opis - LMZ21700_15 |
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