SLVSGG9A June   2023  – September 2023 TPS922052 , TPS922053 , TPS922054 , TPS922055

PRODUCTION DATA  

  1.   1
  2. 1 Features
  3. 2 Applications
  4. 3 Description
  5. 4 Revision History
  6. 5 Device Comparison Table
  7. 6 Pin Configuration and Functions
  8. 7 Specifications
    1. 7.1 Absolute Maximum Ratings
    2. 7.2 ESD Ratings
    3. 7.3 Recommended Operating Conditions
    4. 7.4 Thermal Information
    5. 7.5 Electrical Characteristics
    6. 7.6 Typical Characteristics
  9. 8 Detailed Description
    1. 8.1 Overview
    2. 8.2 Functional Block Diagram
    3. 8.3 Feature Description
      1. 8.3.1 Adaptive Off-Time Current Mode Control
        1. 8.3.1.1 Switching Frequency Settings
        2. 8.3.1.2 Spread Spectrum
      2. 8.3.2 Setting LED Current
      3. 8.3.3 Undervoltage Lockout
      4. 8.3.4 Internal Soft Start
      5. 8.3.5 Dimming Mode
        1. 8.3.5.1 PWM Dimming
        2. 8.3.5.2 Analog Dimming
        3. 8.3.5.3 Hybrid Dimming
        4. 8.3.5.4 Flexible Dimming
      6. 8.3.6 CC/CV Charging Mode
      7. 8.3.7 Fault Protection
      8. 8.3.8 Thermal Foldback
  10. 9 Application and Implementation
    1. 9.1 Application Information
    2. 9.2 Typical Application
      1. 9.2.1 TPS922054 24-V Input, 4-A Output, 4-piece WLED Driver With Analog Dimming
        1. 9.2.1.1 Design Requirements
        2. 9.2.1.2 Detailed Design Procedure
          1. 9.2.1.2.1 Inductor Selection
          2. 9.2.1.2.2 Input Capacitor Selection
          3. 9.2.1.2.3 Output Capacitor Selection
          4. 9.2.1.2.4 Sense Resistor Selection
          5. 9.2.1.2.5 Other External Components Selection
        3. 9.2.1.3 Application Curves
      2. 9.2.2 TPS922054 48-V Input, 2-A Output, 12-piece WLED Driver with PWM Dimming
        1. 9.2.2.1 Design Requirements
        2. 9.2.2.2 Detailed Design Procedure
          1. 9.2.2.2.1 Inductor Selection
          2. 9.2.2.2.2 Input Capacitor Selection
          3. 9.2.2.2.3 Output Capacitor Selection
          4. 9.2.2.2.4 Sense Resistor Selection
          5. 9.2.2.2.5 Other External Components Selection
        3. 9.2.2.3 Application Curves
    3. 9.3 Power Supply Recommendations
    4. 9.4 Layout
      1. 9.4.1 Layout Guidelines
      2. 9.4.2 Layout Example
  11. 10Device and Documentation Support
    1. 10.1 Receiving Notification of Documentation Updates
    2. 10.2 Support Resources
    3. 10.3 Trademarks
    4. 10.4 Electrostatic Discharge Caution
    5. 10.5 Glossary
  12. 11Mechanical, Packaging, and Orderable Information

Package Options

Mechanical Data (Package|Pins)
Thermal pad, mechanical data (Package|Pins)
Orderable Information

8.1 Overview

The TPS92205x family is a 2-A / 4-A non-synchronous Buck LED driver with 4.5-V to 65-V wide input range. By integrating the low-side NMOS switch with constant current and constant voltage controls, the device is capable of not only driving LEDs but also charging batteries with high power density and high efficiency. The device also supports common anode connection and single layer PCB design, hence saving cost of connector, harness and PCB. The switching frequency is configurable through FSET pin, ranging from 100 kHz to 2.2 MHz, with optional spread spectrum feature to decrease the EMC emission and reduce the input filter size.

The device supports four dimming options, including analog dimming, PWM dimming, hybrid dimming and flexible dimming. Each dimming method can be configured through the PWM and ADIM input pins by means of simple high/low sequencing signals at startup. In PWM dimming mode, once the dimming mode is configured, LED is turned on and off corresponding to on and off of the PWM input signal at PWM input pin. The PWM dimming mode supports ultra-narrow pulse width down to 150 ns. In analog dimming mode, LED current is regulated corresponding to the pulse width duty cycle of the PWM input signal at ADIM input pin. In hybrid dimming mode, the LED current is controlled by a pre-determined combination of analog dimming and PWM dimming through the PWM input signal at PWM input pin. In flexible dimming mode, the LED current is controlled by analog dimming through the PWM input signal at ADIM input pins and PWM dimming through the PWM input signal at PWM input pins, respectively. The device adopts an adaptive off-time current mode control along with smart and accurate sampling to enable Inductive Fast Dimming (IFD) and achieve high dimming accuracy. The compensation bandwidth can be adjusted through an external capacitor based on system requirement.

For safety and protection, the devices support full systematic protections including LED open and short, sense resistor open and short, configurable thermal foldback and thermal shutdown protection. The fault output pin sends out acknowledge signals as soon as any fault condition is detected.