上电顺序控制
- 1、下载文档前请自行甄别文档内容的完整性，平台不提供额外的编辑、内容补充、找答案等附加服务。
- 2、"仅部分预览"的文档,不可在线预览部分如存在完整性等问题,可反馈申请退款(可完整预览的文档不适用该条件!)。
- 3、如文档侵犯您的权益，请联系客服反馈,我们会尽快为您处理(人工客服工作时间：9:00-18:30)。
Application Report
SLVA470–November 2011
TPS62130/40/50Sequencing and Tracking
Tahar Allag /Chris Glaser Battery Power Applications
ABSTRACT
The TPS6213x/4x/5x is a family of synchronous buck DC-DC converters with a wide operating input voltage range from 3V to 17V and adjustable output voltage of 0.9V to 6V.Because of the wide input and output voltage ranges,they are ideal for use in systems which contain multiple output voltage rails.This application note describes how to use the EN,PG,and SS/TR pins in tracking and sequencing applications in such systems which contain any combination of the TPS6213x,TPS6214x,or TPS6215x devices.
Contents 1
Device Description ..........................................................................................................11.1Soft Start and Tracking (SS/TR).................................................................................21.2Enable (EN).........................................................................................................21.3Power Good (PG).. (22)
Sequential Start Up Using EN and PG (33)
Ratiometric Start Up Using Connected SS/TR Pins (44)
Ratiometric and Simultaneous Start Up ..................................................................................54.1V OUT 1Leading V OUT 2...............................................................................................74.2V OUT 2Leading V OUT 1...............................................................................................74.3Simultaneous Start Up ............................................................................................85Conclusion and References ...............................................................................................
95.1Conclusion ..........................................................................................................
95.2References ..........................................................................................................
9
List of Figures 1
Soft Start Ramp Up Time (22)
Sequential Start Up Using the EN and PG Pins (33)
Sequential Start Up Using the EN and PG Pins (Results of the Circuit of Figure 2) (34)
Ratiometric Start Up Using the SS/TR Pins (45)
The Ratiometric Start Up (Result of the Circuit in Figure 4) (56)
Ratiometric and Simultaneous Start Up Sequence (67)
Ratiometric Start Up with V OUT 1Leading V OUT 2 (78)
Ratiometric Start Up with V OUT 2Leading V OUT 1.........................................................................
8
9Simultaneous Start Up (9)
1Device Description
The TPS6213x/4x/5x devices are easy to use synchronous step down DC-DC converters suited for applications that requires tracking and sequencing.They have a built in power good function to indicate the status of the device,a soft start circuit to control the output voltage slope during start up,and an enable function for controlling the turn on of the device.Each of these functions is useful for tracking and sequencing.
1
SLVA470–November 2011
TPS62130/40/50Sequencing and Tracking Submit Documentation Feedback Copyright ©2011,Texas Instruments Incorporated