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TPS65321A-Q1 Datasheet(PDF) 22 Page - Texas Instruments |
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TPS65321A-Q1 Datasheet(HTML) 22 Page - Texas Instruments |
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22 / 43 page  GND SW BOOT VIN RT/CLK SS Supply RST FB1 EN2 5 V COMP TPS65321-Q1 EN1 PowerPAD VI = 6 V to 36 V LDO_OUT VIN_LDO FB2 C8 100 F R4 47 k C6 3.3 nF R3 22 k R5 95.3 k R6 18 k C1 4.7 nF C7 10 F C2 (Optional) 12 pF D1 3.3 V R2 10 k R1 31.6 k C3 0.1 F L1 3.3 H C4 47 F C5 47 F VIO R7 10 k Supply VI = 6 V to 36 V C9 4.7 F Copyright © 2017, Texas Instruments Incorporated 22 TPS65321A-Q1 SLVSE55 – NOVEMBER 2017 www.ti.com Product Folder Links: TPS65321A-Q1 Submit Documentation Feedback Copyright © 2017, Texas Instruments Incorporated 8 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. 8.1 Application Information The TPS65321A-Q1 buck regulator operates with a supply voltage of 3.6 V to 36 V. The TPS65321A-Q1 LDO regulator operates with a supply voltage of 3 V to 36 V V. To reduce power dissipation, TI recommends to use the output voltage of the buck regulator as the input supply for the LDO regulator. To use the output voltage of the buck regulator in this way, the selected buck-regulator output voltage must be higher than the selected LDO- regulator output voltage. To optimize the switching performance (such as low jitter) in automotive applications with input voltages that have wide ranges, TI recommends to operate the device at higher frequencies, such as 2 MHz, which also helps achieve AM-band compliance requirements (that extends until 1.7 MHz). 8.2 Typical Application 8.2.1 2-MHzSwitching Frequency, 9-V to 16-V Input, 3.3-V Output Buck Regulator, 5-V Output LDO Regulator This example details the design of a high-frequency switching regulator and linear regulator using ceramic output capacitors. Figure 16. TPS65321A-Q1 Design Example With 2-MHz Switching Frequency |
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