TPS92002DR Integrated Circuits (ICs)

Voltage - Output:	5V
Base Part Number:	TPS92002
Supplier Device Package:	8-SOIC
Package / Case:	8-SOIC (0.154", 3.90mm Width)
Mounting Type:	Surface Mount
Operating Temperature:	-40°C ~ 85°C (TA)
Applications:	Lighting
Dimming:	Triac
Frequency:	100kHz
Current - Output / Channel:	--
Series:	--
Voltage - Supply (Max):	21V
Voltage - Supply (Min):	--
Number of Outputs:	1
Internal Switch(s):	No
Topology:	Flyback, Step-Down (Buck)
Type:	AC DC Offline Switcher
Part Status:	Active
Packaging:	Tape & Reel (TR)

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Introduction

The TPS92002DR is an Integrated LED Driver comprised of a boost converter, Linear Regulator and current regulators which enable dimming of a multi-string LED backround illumination system. TPS92002DR is a high-performance LED driver for LED backlight applications in portable and stationary display systems. It integrates several voltage regulators and current control circuitry, allowing the user to control the LED current and brightness independently of the input voltage. It has a wide input voltage range and low quiescent current, which make it very suitable for battery-operated applications.

Feature

The TPS92002DR is designed to drive LEDs in mobile displays with efficient DC-DC voltage regulation and current regulation. Its features include:• Wide Input Voltage Range: The device operates over the input voltage range of 2.7V to 5.5V.• High Efficiency: In boost mode, the efficiency of the TPS92002DR regulator is up to 90%.• Adjustable Output Voltage: The Adjustable Output Voltage allows for customization of the led brightness and power consumption.• Thermal Protection: The device includes built-in thermal protection which will automatically turn off the device in the event of an over-temperature condition.• Low Quiescent Current: The quiescent current consumption of the device is less than 20µA.• Dimming Control: The TPS92002DR can be dimmed via either an analog voltage input or an I2C digital interface.

Application

The TPS92002DR is ideal for use in a variety of portable displays and lighting applications. Its wide input voltage range and low quiescent current make it especially suitable for battery-powered applications. Examples of applications include:• Portable displays• Keypad backlight• Infotainment systems• Automotive lighting • Medical displays• Building Automation• LED Bulbs

Working Principle

The TPS92002DR utilizes an integrated boost topology to regulate the LED current. The device supports both constant current and constant voltage LED configurations. The LED current is controlled via external resistors, which sets the LED current prior to the boost stage. The device will then take this input current and regulate the output voltage to match the input current.The device contains a Linear Regulator which is used to regulate the voltage supplied to the LED string. This is used to ensure the LED current remains constant across a range of input voltages. In addition to this, the Linear Regulator can be used to dim the LED string by varying the output voltage. The device also contains an I2C interface which the user can use to adjust the LED current, or to dim the LED string digitally.

Conclusion

The TPS92002DR is a high-performance LED driver designed for LED backlight applications in mobile and stationary display systems. It integrates a boost converter, linear regulator and current regulators, allowing independent control of the LED current and brightness. It has a wide input voltage range, high efficiency and low quiescent current, making it very suitable for battery-operated applications. The device is perfect for portable displays, keypad backlight, infotainment systems, automotive lighting, medical displays and building automation, among other applications.

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