ZHCSKJ3D december 2019 – may 2023 TPS652353
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
- 7.1 Overview
- 7.2 Functional Block Diagram
- 7.3
Feature Description
- 7.3.1 Boost Converter
- 7.3.2 Linear Regulator and Current Limit
- 7.3.3 Boost Converter Current Limit
- 7.3.4 Charge Pump
- 7.3.5 Slew Rate Control
- 7.3.6 Short Circuit Protection, Hiccup and Overtemperature Protection
- 7.3.7 Tone Generation
- 7.3.8 Tone Detection
- 7.3.9 Audio Noise Rejection
- 7.3.10 Disable and Enable
- 7.3.11 Component Selection
- 7.4 Device Functional Modes
- 7.5 Programming
- 7.6 Register Maps
- 8 Application and Implementation
- 9 Device and Documentation Support
- 10Mechanical, Packaging, and Orderable Information
7.3.11.1 Boost Inductor
The TPS652353 device is recommended to operate with a boost inductor value of 4.7 µH or 10 µH. The boost inductor must be able to support the peak current requirement to maintain the maximum LNB output current without saturation. Use Equation 5 to estimate the peak current of the boost inductor (Ipeak).
where
With a different inductance, the system has different gain and phase margins. Figure 7-5 shows a Bode plot of boost loop with 2 × 10 µF / 35 V of boost capacitor and 4.7 µH, 5.6 µH, 6.8 µH, 8.2 µH, and 10 µH of boost inductance. As the boost inductance increases, the 0-dB crossover frequency keeps relatively constant while reducing the phase and gain margins. With a 4.7-µH boost inductance, the phase margin is 66.96° and with a 10-µH inductance, the phase margin is 39.63°.
Figure 7-5 Gain and Phase Margin of the Boost Loop with Different Inductance (VIN = 12 V, VOUT = 18.2 V, ILOAD = 1 A, fSW = 1 MHz, 5 µF, Typical Bode Plot)