LM2794TLX/NOPB

Voltage - Output:	3.8V
Base Part Number:	LM2794
Supplier Device Package:	14-µSMD (2.1x2.4)
Package / Case:	14-WFBGA
Mounting Type:	Surface Mount
Operating Temperature:	-30°C ~ 85°C (TA)
Applications:	Backlight
Dimming:	Analog, PWM
Frequency:	515kHz
Current - Output / Channel:	20mA
Series:	--
Voltage - Supply (Max):	5.5V
Voltage - Supply (Min):	2.7V
Number of Outputs:	4
Internal Switch(s):	Yes
Topology:	Switched Capacitor (Charge Pump)
Type:	DC DC Regulator
Part Status:	Obsolete
Packaging:	Tape & Reel (TR)

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Introduction

The LM2794TLX/NOPB is a power management integrated circuit (PMIC) from Texas Instruments that provides an efficient and economical solution for driving LEDs in high power applications. It is an advanced three-channel LED driver that is designed to drive up to three LED strings with a single LED string current of up to 35 mA. The device is designed to be used in automotive or industrial applications and works by controlling a wide input voltage range (from 8 to 30 V) to a constant current and turning the LED off after a preset idle time. The LM2794TLX/NOPB provides a best-in-class thermal performance with a very low power dissipation at full output, adjustable output voltage, and high Modulation Frequency Range (MFR). It also offers an adjustable current limit circuit which ensures a safe operation and high efficiency. In addition, the LM2794TLX/NOPB also features an adjustable Soft-Start circuit and Preset Hold-Time (PHT) to improve the linearity of the output current and minimize the current ripple.

Application Field

The LM2794TLX/NOPB is a low-cost, feature-rich PMIC and LED driver solution that is ideal for applications such as automotive headlights and taillights, industrial lighting (including tunnel and outdoor lighting), signage, display backlighting, and stair lighting. The device can be used in environments with high temperature, humidity and dirt levels, or in industrial applications with strict technical requirements due to its wide operating temperature range (-40°C to +105°C) and high voltage tolerance (≥ 8V). The LM2794TLX/NOPB also features protection against transient over-voltage, over-temperature, over-current, and under-voltage conditions. Furthermore, the device is Pb (lead) free, RoHS (Restriction of Hazardous Substances) compliant and UL listed for safety.

Working Principle

The LM2794TLX/NOPB LED driver works by controlling a wide input voltage range (8 to 30 V) to a constant current and turning the LED off after a preset idle time. The device integrates a low on-resistance switch and a linear regulator to provide a high efficiency and constant current output. The device works by monitoring the input voltage and output current, and adjusting the input voltage to maintain a constant output current. The adjustable current limit can be used to reduce the input voltage typically below 10V, ensuring a safe operation and high efficiency. In addition, the adjustable soft-start circuit allows for a smooth transition of the output current to its programmed value.

The device features a proprietary thermal system which reduces the power dissipation at full output thereby improving the overall system efficiency. The LM2794TLX/NOPB also features an adjustable Modulation Frequency Range (MFR) which allows for the LED strings to be driven at various frequencies. The device can work with a wide range of LED strings and is capable of driving strings with no more than three LEDs per string. The device is implemented from a low drop-out (LDO) regulator which provides an accurate low dropout voltage and a fast transient response. In addition, the device offers an adjustable Preset Hold-Time (PHT) which allows for improved linearity of the output current, and minimizes the current ripple, allowing for longer and more durable LED lifetime.

Conclusion

The LM2794TLX/NOPB is an advanced power management integrated circuit and LED driver solution ideal for driving LEDs in high power applications. It is designed to be used in automotive or industrial applications and is engineered to provide an efficient and economical solution for driving LEDs in a wide range of applications. The device is designed to work with a wide input voltage range and provides an adjustable current limit, adjustable soft-start circuit and adjustable Modulation Frequency Range (MFR) to ensure a safe operation and high efficiency. In addition, the device features an adjustable Preset Hold-Time (PHT) to improve the linearity of the output current and minimize the current ripple.

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