ZHCSEC7A October 2012 – October 2015 TPS92640 , TPS92641
PRODUCTION DATA.
- 1 特性
- 2 应用
- 3 说明
- 4 修订历史记录
- 5 Pin Configuration and Functions
- 6 Specifications
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7 Detailed Description
- 7.1 Overview
- 7.2 Functional Block Diagram
- 7.3
Feature Description
- 7.3.1 Controlled On-Time Architecture
- 7.3.2 Switching Frequency
- 7.3.3 Average LED Current
- 7.3.4 Analog Dimming and True-Zero Operation
- 7.3.5 Undervoltage Lockout (UVLO)
- 7.3.6 PWM Dimming Using the UDIM Pin
- 7.3.7 External Shunt FET PWM Dimming
- 7.3.8 VCC Regulation and Start-up
- 7.3.9 Precision Reference
- 7.3.10 Control Loop Compensation
- 7.3.11 Overcurrent Protection
- 7.3.12 Overvoltage Protection (OVP)
- 7.3.13 Boot Undervoltage Lockout (UVLO)
- 7.4 Device Functional Modes
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8 Application and Implementation
- 8.1 Application Information
- 8.2
Typical Applications
- 8.2.1
TPS92640: Design Procedure
- 8.2.1.1 Design Requirements
- 8.2.1.2
Detailed Design Procedure
- 8.2.1.2.1 Set Output Voltage Feedback Ratio
- 8.2.1.2.2 Set Switching Frequency
- 8.2.1.2.3 Set Average LED Current
- 8.2.1.2.4 Set Inductor Ripple Current
- 8.2.1.2.5 Set LED Ripple Current and Determine Output Capacitance, COUT
- 8.2.1.2.6 Choose N-Channel MOSFETs
- 8.2.1.2.7 Choose Input Capacitance
- 8.2.1.2.8 Set the Turnon Voltage and Undervoltage Lockout Hysteresis
- 8.2.2
TPS92640 - PWM Dimming Application
- 8.2.2.1 Design Requirements
- 8.2.2.2
Detailed Design Procedure
- 8.2.2.2.1 Calculate Operating Points
- 8.2.2.2.2 Output Voltage Feedback
- 8.2.2.2.3 Switching Frequency
- 8.2.2.2.4 Set the Feedback Reference and LED Current
- 8.2.2.2.5 Calculate the Inductor Value
- 8.2.2.2.6 Calculate the Output Capacitor Value
- 8.2.2.2.7 Calculate the MOSFET Parameters
- 8.2.2.2.8 Calculate the Minimum Input Capacitance
- 8.2.2.2.9 Undervoltage Lockout and Hysteresis
- 8.2.2.3 Application Curve
- 8.2.1
TPS92640: Design Procedure
- 9 Power Supply Recommendations
- 10Layout
- 11器件和文档支持
- 12机械、封装和可订购信息
11 器件和文档支持
11.1 相关链接
下面的表格列出了快速访问链接。 范围包括技术文档、支持和社区资源、工具和软件，以及样片或购买的快速访问。
11.2 社区资源
The following links connect to TI community resources. Linked contents are provided "AS IS" by the respective contributors. They do not constitute TI specifications and do not necessarily reflect TI's views; see TI's Terms of Use.
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TI E2E™ Online Community TI's Engineer-to-Engineer (E2E) Community. Created to foster collaboration among engineers. At e2e.ti.com, you can ask questions, share knowledge, explore ideas and help solve problems with fellow engineers.
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Design Support TI's Design Support Quickly find helpful E2E forums along with design support tools and contact information for technical support.
11.3 商标
E2E is a trademark of Texas Instruments.
All other trademarks are the property of their respective owners.
11.4 静电放电警告
这些装置包含有限的内置 ESD 保护。 存储或装卸时，应将导线一起截短或将装置放置于导电泡棉中，以防止 MOS 门极遭受静电损伤。
11.5 Glossary
SLYZ022 — TI Glossary.
This glossary lists and explains terms, acronyms, and definitions.