TPS40100芯片数据表无法查询到最小的输出建立时间;目前遇到一个问题,当在芯片ss(softstart)引脚对GND加100nF电容时,Vout建立时间约4ms;当将ss引脚对GND电容容量减小,例如47nF、10nF等值时,Vout建立时间仍然无法改变,想请教贵司是什么原因?
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Yuchang
Hi Cao,
Did you use tracking in your application? Could you send us the schematic?
Thanks,
Nancy
The TPS40100 start-up will track the slower of the SS defined soft-start time or the tracking input. Check the rise-time on your TRKIN and TRKOUT if you are not seeing a faster start-up with reduced SS capacitance.
Hi Cao,
Please refer to datasheet page 23 " Interaction between Soft-start and Tracking Startup" section. When you used tracking to control the start up, the soft-start should not be set to a short time and the soft start ramp must be within the capability of the tracking loop to override.
Hope this helps,
Thanks,
Nancy