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TPS9264x Synchronous Buck Controllers for Precision Dimming LED Drivers
SNVS902A
October 2012 – October 2015
TPS92640
,
TPS92641
PRODUCTION DATA.
CONTENTS
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TPS9264x Synchronous Buck Controllers for Precision Dimming LED Drivers
1
Features
2
Applications
3
Description
4
Revision History
5
Pin Configuration and Functions
6
Specifications
6.1
Absolute Maximum Ratings
6.2
ESD Ratings
6.3
Recommended Operating Conditions
6.4
Thermal Information
6.5
Electrical Characteristics
6.6
Typical Characteristics
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
7.4.1
Low Power Shutdown Using the UDIM Pin
7.4.2
Thermal Shutdown
8
Application and Implementation
8.1
Application Information
8.1.1
Switching Frequency
8.1.2
LED Ripple Current
8.1.3
Buck Converters Without Output Capacitor
8.1.4
Input Capacitor
8.1.5
NFETs
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
9
Power Supply Recommendations
10
Layout
10.1
Layout Guidelines
10.2
Layout Example
10.3
EMI and Noise Considerations
11
Device and Documentation Support
11.1
Related Links
11.2
Community Resources
11.3
Trademarks
11.4
Electrostatic Discharge Caution
11.5
Glossary
12
Mechanical, Packaging, and Orderable Information
IMPORTANT NOTICE
Package Options
Mechanical Data (Package|Pins)
PWP|14
MPDS370A
Thermal pad, mechanical data (Package|Pins)
PWP|14
PPTD288A
Orderable Information
snvs902a_oa
snvs902a_pm
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