SLVSCU0
November 2015
TPS92690-Q1
PRODUCTION DATA.
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
Current Regulators
7.3.2
Peak Current Mode Control
7.3.3
Switching Frequency and Synchronization
7.3.4
Current Sense and Current Limit
7.3.5
Average LED Current
7.3.6
Precision Reference (VREF)
7.3.7
Low-Level Analog Dimming
7.3.8
Soft-Start and Shutdown
7.3.9
VCC Regulator and Start-Up
7.3.10
Overvoltage Protection (OVP)
7.3.11
Input Undervoltage Lockout (UVLO)
7.3.12
PWM Dimming
7.3.13
Control Loop Compensation
7.3.14
Thermal Shutdown
7.4
Device Functional Modes
8
Application and Implementation
8.1
Application Information
8.1.1
Inductor
8.1.2
LED Dynamic Resistance
8.1.3
Output Capacitor
8.1.4
Input Capacitor
8.1.5
MOSFET Selection
8.1.6
Recirculating Diode
8.2
Typical Applications
8.2.1
Basic Topology Schematics
8.2.1.1
Design Requirements
8.2.1.2
Detailed Design Procedure
8.2.1.2.1
Operating Point
8.2.1.2.2
Switching Frequency
8.2.1.2.3
Average LED Current
8.2.1.2.4
Inductor Ripple Current
8.2.1.2.5
Output Capacitance
8.2.1.2.6
Peak Current Limit
8.2.1.2.7
Loop Compensation
8.2.1.2.8
Input Capacitance
8.2.1.2.9
NFET
8.2.1.2.10
Diode
8.2.1.2.11
Input UVLO
8.2.1.2.12
Output OVLO
8.2.1.3
Application Curve
8.2.2
Simplified Application
8.2.2.1
Design Requirements
8.2.2.2
Detailed Design Procedure
8.2.2.2.1
Operating Point
8.2.2.2.2
Switching Frequency
8.2.2.2.3
Average LED Current
8.2.2.2.4
Inductor Ripple Current
8.2.2.2.4.1
Minimum Inductor Value
8.2.2.2.4.2
Inductor Ripple Current
8.2.2.2.4.3
RMS Inductor Current
8.2.2.2.5
LED Ripple Current
8.2.2.2.5.1
Output Capacitor
8.2.2.2.5.2
Output Capacitor RMS Current
8.2.2.2.6
Peak Current Limit
8.2.2.2.7
Loop Compensation
8.2.2.2.7.1
Compensation Capacitor
8.2.2.2.7.2
RHP Zero
8.2.2.2.7.3
Output Capacitor Pole
8.2.2.2.8
Input Capacitance
8.2.2.2.9
NFET
8.2.2.2.9.1
Maximum Average NFET Current
8.2.2.2.9.2
RMS Transistor Current
8.2.2.2.10
Diode
8.2.2.2.10.1
Maximum Average Diode Current
8.2.2.2.11
Output OVLO
8.2.2.2.12
Input UVLO
8.2.2.2.13
Soft-Start
8.2.2.2.14
PWM Dimming Method
8.2.2.2.15
Analog Dimming Method
9
Power Supply Recommendations
9.1
Bench Supply Current Limit
10
Layout
10.1
Layout Guidelines
10.2
Layout Example
11
Device and Documentation Support
11.1
Community Resources
11.2
Trademarks
11.3
Electrostatic Discharge Caution
11.4
Glossary
12
Mechanical, Packaging, and Orderable Information
Package Options
Mechanical Data (Package|Pins)
PWP|16
MPDS371A
Thermal pad, mechanical data (Package|Pins)
PWP|16
PPTD288A
Orderable Information
slvscu0_oa
slvscu0_pm
4 Revision History
DATE
REVISION
NOTES
November 2015
*
Initial release.
Released as a separate data sheet from the TPS92690 data sheet (
SLVSBK3
)