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TPS560200DBVT 데이터시트(PDF) 10 Page - Texas Instruments |
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TPS560200DBVT 데이터시트(HTML) 10 Page - Texas Instruments |
10 / 22 page F = P OUT OUT 1 2 L x C p OUT R1 0.8 V R2 = V -0.8V ´ 10µF C4 10µH L1 10µF C5 VIN 4.5-17V VOUT 1.05V, 0.5 A 0.1µF C2 C3 TPS560200 VIN 4 EN 1 VSENSE 5 GND 2 PH 3 U1 10µF C1 6.19k R1 20.0k R2 open 10 TPS560200 SLVSC81C – SEPTEMBER 2013 – REVISED FEBRUARY 2016 www.ti.com Product Folder Links: TPS560200 Submit Documentation Feedback Copyright © 2013–2016, 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 TPS560200 is used as a step-down converter which converts a voltage of 4.5 V to 17 V to a lower voltage. WEBENCH® software is available to aid in the design and analysis of circuits. 8.2 Typical Application Figure 7. Typical Application Schematic 8.2.1 Design Requirements To begin the design process, the user must know a few application parameters: Table 1. Design Parameters PARAMETER VALUES Input voltage range 4.5 V to 17 V Output voltage 1.05 V Output current 500 mA Output voltage ripple 10 mV/pp 8.2.2 Detailed Design Procedure 8.2.2.1 Output Voltage Resistors Selection The output voltage is set with a resistor divider from the output node to the VFB pin. TI recommends using 1% tolerance or better divider resistors. Start by using Equation 2 to calculate VOUT. To improve efficiency at light loads, consider using larger value resistors, high resistance is more susceptible to noise, and the voltage errors from the VSENSE input current are more noticeable. (2) 8.2.2.2 Output Filter Selection The output filter used with the TPS560200 is an LC circuit. This LC filter has double pole at: (3) |
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