ZHCSEC7A October 2012 – October 2015 TPS92640 , TPS92641
PRODUCTION DATA.
- 1 特性
- 2 應用
- 3 說明
- 4 修訂歷史記錄
- 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器件和文檔支持
- 12機械、封裝和可訂購信息
11 器件和文檔支持
11.1 相關鏈接
下面的表格列出了快速訪問鏈接。 范圍包括技術文檔、支持和社區資源、工具和軟件，以及樣片或購買的快速訪問。
11.2 社區資源
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 商標
E2E is a trademark of Texas Instruments.
All other trademarks are the property of their respective owners.
11.4 靜電放電警告
這些裝置包含有限的內置 ESD 保護。 存儲或裝卸時，應將導線一起截短或將裝置放置于導電泡棉中，以防止 MOS 門極遭受靜電損傷。
11.5 Glossary
SLYZ022 — TI Glossary.
This glossary lists and explains terms, acronyms, and definitions.