In this artical ,the author questions:
When test TPS54229 EVM found there is big spike or ripple voltage during startup, but there is no similar issue refer to TPS54229 EVM user guide, would you help clarify the reason and help solve the issue?
Link to this post:http://www.deyisupport.com/question_answer/analog/power_management/f/24/t/9552.aspx
Answers to the questions of TI FAE: Trevor、 Martin Ma1 、 Stone Zeng
Let me introduce the power management chip of TPS54229:
The TPS54229 is an adaptive on-time D-CAP2 mode synchronous buck converter. TheTPS54229 enables system designers to complete the suite of various end equipment’s power bus regulators with a cost effective, low component count, low standby current solution. The main control loop for the TPS54229 uses the D-CAP2 mode control which provides a fast transient response with no external compensation components. The TPS54229 also has a proprietary circuit that enables the device to adopt to both low equivalent series resistance (ESR) output capacitors, such as POSCAP or SP-CAP, and ultra-low ESR ceramic capacitors. The device operates from 4.5-V to 18-V VIN input. The output voltage can be programmed between 0.76 V and 7 V. The device also features an adjustable soft start time. The TPS54229 is available in the 8-pin DDA package, and designed to operate from –40°C to 85°C.
Typical Application Circuit as shown below:
Absolute maximum rayings as shown below:
Recommended operating conditions as shown below:
Author simulation waveforms as shown below:
about this ,the TI FAE answers:
As can be seen from their answers,we can learn about the chip of TPS54229,I encountered such a problem for the future, providing answers to the idea, but also increase their experience.thanks very much.