ZHCSC24E january 2014 – may 2023 TPS562200 , TPS563200
PRODUCTION DATA
- 1
- 1 特性
- 2 应用
- 3 说明
- 4 Revision History
- 5 Pin Configuration and Functions
- 6 Specifications
- 7 Detailed Description
- 8 Application and Implementation
- 9 Device and Documentation Support
- 10Mechanical, Packaging, And Orderable Information
8.2.2.2.1 Output Filter Selection
| Output Voltage (V) | R2 (kΩ) | R3 (kΩ) | L1 (µH) | C5 + C6 + C7 (µF) | ||
|---|---|---|---|---|---|---|
| MIN | TYP | MAX | ||||
| 1 | 3.09 | 10.0 | 1.0 | 1.5 | 4.7 | 20 - 68 |
| 1.05 | 3.74 | 10.0 | 1.0 | 1.5 | 4.7 | 20 - 68 |
| 1.2 | 5.76 | 10.0 | 1.0 | 1.5 | 4.7 | 20 - 68 |
| 1.5 | 9.53 | 10.0 | 1.0 | 1.5 | 4.7 | 20 - 68 |
| 1.8 | 13.7 | 10.0 | 1.5 | 2.2 | 4.7 | 20 - 68 |
| 2.5 | 22.6 | 10.0 | 1.5 | 2.2 | 4.7 | 20 - 68 |
| 3.3 | 33.2 | 10.0 | 1.5 | 2.2 | 4.7 | 20 - 68 |
| 5 | 54.9 | 10.0 | 2.2 | 3.3 | 4.7 | 20 - 68 |
| 6.5 | 75 | 10.0 | 2.2 | 3.3 | 4.7 | 20 - 68 |
The inductor peak-to-peak ripple current, peak current and RMS current are calculated using Equation 8, Equation 9 and Equation 10. The inductor saturation current rating must be greater than the calculated peak current and the RMS or heating current rating must be greater than the calculated RMS current. Use 650 kHz for ƒSW.
Use 650 kHz for ƒSW. Make sure the chosen inductor is rated for the peak current of Equation 9 and the RMS current of Equation 10.
For this design example, the calculated peak current is 3.505 A and the calculated RMS current is 3.014 A. The inductor used is a TDK CLF7045T-1R5N with a peak current rating of 7.3 A and an RMS current rating of 4.9 A.
The capacitor value and ESR determines the amount of output voltage ripple. The TPS563209 is intended for use with ceramic or other low ESR capacitors. Recommended values range from 20 μF to 68 μF. Use Equation 6 to determine the required RMS current rating for the output capacitor. For this design three TDK C3216X5R0J226M 22μF output capacitors are used. The typical ESR is 2 mΩ each. The calculated RMS current is 0.292 A and each output capacitor is rated for 4 A.