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LMR23630AFDDA Datasheet(PDF) 21 Page - Texas Instruments |
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LMR23630AFDDA Datasheet(HTML) 21 Page - Texas Instruments |
21 / 42 page ![]() OUT REF FBT FBB REF V V R R V u 21 LMR23630 www.ti.com SNVSAH2C – DECEMBER 2015 – REVISED JUNE 2017 Product Folder Links: LMR23630 Submit Documentation Feedback Copyright © 2015–2017, Texas Instruments Incorporated 1. Inductance value is calculated based on VIN = 36 V. 2. All the COUT values are after derating. Add more when using ceramic capacitors. 3. RFBT = 0 Ω for VOUT = 1 V. RFBB = 22.1 kΩ for all other VOUT setting. 4. or designs with RFBT other than recommended value, please adjust CFF such that (CFF × RFBT) is unchanged and adjust RFBB such that (RFBT / RFBB) is unchanged. 9.2.1 Design Requirements Detailed design procedure is described based on a design example. For this design example, use the parameters listed in Table 3 as the input parameters. Table 3. Design Example Parameters DESIGN PARAMETER EXAMPLE VALUE Input voltage, VIN 12 V typical, range from 8 V to 28 V Output voltage, VOUT 5 V Maximum output current IO_MAX 3 A Transient response 0.2 A to 2.5 A 5% Output voltage ripple 50 mV Input voltage ripple 400 mV Switching frequency fSW 400 kHz 9.2.2 Detailed Design Procedure 9.2.2.1 Custom Design With WEBENCH® Tools Click here to create a custom design using the LMR23625 device with the WEBENCH® Power Designer. 1. Start by entering the input voltage (VIN), output voltage (VOUT), and output current (IOUT) requirements. 2. Optimize the design for key parameters such as efficiency, footprint, and cost using the optimizer dial. 3. Compare the generated design with other possible solutions from Texas Instruments. The WEBENCH Power Designer provides a customized schematic along with a list of materials with real-time pricing and component availability. In most cases, these actions are available: • Run electrical simulations to see important waveforms and circuit performance • Run thermal simulations to understand board thermal performance • Export customized schematic and layout into popular CAD formats • Print PDF reports for the design, and share the design with colleagues Get more information about WEBENCH tools at www.ti.com/WEBENCH. 9.2.2.2 Output Voltage Setpoint The output voltage of LMR23630 is externally adjustable using a resistor divider network. The divider network is comprised of top feedback resistor RFBT and bottom feedback resistor RFBB. Equation 11 is used to determine the output voltage: (11) Choose the value of RFBB to be 22.1 kΩ. With the desired output voltage set to 5 V and the VREF = 1 V, the RFBB value can then be calculated using Equation 11. The formula yields to a value 88.7 k Ω. 9.2.2.3 Switching Frequency The default switching frequency of the LMR23630 is 400 kHz. For other switching frequency, the device must be synchronized to an external clock, see Enable/Sync for more details. |
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