SLIS178B
October 2017 – January 2018
TPS92830-Q1
PRODUCTION DATA.
1
Features
2
Applications
3
Description
Simplified Schematic
4
Revision History
5
Description (Continued)
6
Pin Configuration and Functions
Pin Functions
7
Specifications
7.1
Absolute Maximum Ratings
7.2
ESD Ratings
7.3
Recommended Operating Conditions
7.4
Thermal Information
7.5
Electrical Characteristics
7.6
Timing Requirements
7.7
Typical Characteristics
8
Detailed Description
8.1
Overview
8.2
Functional Block Diagram
8.3
Feature Description
8.3.1
Device Bias
8.3.1.1
Power-On-Reset (POR)
8.3.1.2
Current Reference (IREF)
8.3.1.3
Low-Current Fault Mode
8.3.2
Charge Pump
8.3.2.1
Charge Pump Architecture
8.3.3
Constant-Current Driving
8.3.3.1
High-Side Current Sense
8.3.3.2
High-Side Current Driving
8.3.3.3
Gate Overdrive Voltage Protection
8.3.3.4
High-Precision Current Regulation
8.3.3.5
Parallel MOSFET Driving
8.3.4
PWM Dimming
8.3.4.1
Supply Dimming
8.3.4.2
PWM Dimming by Input
8.3.4.3
Internal Precision PWM Generator
8.3.4.4
Full Duty-Cycle Switch
8.3.5
Analog Dimming
8.3.5.1
Analog Dimming Topology
8.3.5.2
Internal High-Precision Pullup Current Source
8.3.6
Output Current Derating
8.3.6.1
Output-Current Derating Topology
8.3.7
Diagnostics and Fault
8.3.7.1
LED Short-to-GND Detection
8.3.7.2
LED Short-to-GND Auto Retry
8.3.7.3
LED Open-Circuit Detection
8.3.7.4
LED Open-Circuit Auto Retry
8.3.7.5
Dropout-Mode Diagnostics
8.3.7.6
Overtemperature Protection
8.3.7.7
FAULT Bus Output With One-Fails–All-Fail
8.3.7.8
Fault Table
8.4
Device Functional Modes
8.4.1
Undervoltage Lockout, V(IN) < V(UVLO)
8.4.2
Normal Operation (V(IN) ≥ 4.5 V, V(IN) > V(LED) + 0.5 V)
8.4.3
Low-Voltage Dropout
8.4.4
Fault Mode (Fault Is Detected)
9
Application and Implementation
9.1
Application Information
9.2
Typical Applications
9.2.1
Typical Application for Automotive Exterior Lighting With One-Fails–All-Fail
9.2.1.1
Design Requirements
9.2.1.2
Detailed Design Procedure
9.2.1.3
Application Curves
9.2.2
High-Precision Dual-Brightness PWM Generation
9.2.2.1
Dual-Brightness Application
9.2.2.2
Design Requirements
9.2.2.3
Detailed Design Procedure
9.2.2.4
Application Curve
9.2.3
Driving High-Current LEDs With Parallel MOSFETs
9.2.3.1
Application Curves
10
Layout
10.1
Layout Guidelines
10.2
Layout Example
11
Device and Documentation Support
11.1
Receiving Notification of Documentation Updates
11.2
Community Resources
11.3
Trademarks
11.4
Electrostatic Discharge Caution
11.5
Glossary
12
Mechanical, Packaging, and Orderable Information
11
Device and Documentation Support