TLD1211SJFUMA1

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LED (light-emitting diode) drivers are integrated circuits that provide the appropriate electric current to a light-emitting diode to make it glow bright. Without the right electric current, an LED will not light up. A well-designed LED driver ensures that the LED receives the right electric current and voltage, at the right time, so that it functions optimally. Increasing commitment to energy-saving, cost-efficient solutions has led to surge in the demand for LED drivers. TLD1211SJFUMA1 is one of the high performance LED drivers from TI. This application note provides a description on TLD1211SJFUMA1 as a PMIC - LED driver.

TLD1211SJFUMA1

TLD1211SJFUMA1 from TI (Texas Instruments Inc) is a control chip that helps in driving power LEDs. This chip is a constant current driver with a step-up (boost) converter to achieve high brightness for the LEDs. It is designed for the constant-current of a string of LEDs and adapts to supply voltage variations due to changes in the load or output current. It provides a constant current even under load variations, with superior efficiency and fast transient response.

TLD1211SJFUMA1 has an adjustable current up to 1.2A with an external sense resistor. It has built−in input under voltage protection with external P-Channel MOSFET and provides an input voltage range of 4.5V to 36V. This LED driver chip comes in an easy–to–use and tiny 8-pin package.

TLD1211SJFUMA1 Features

• Built−in internal P-Channel MOSFET
• Input Under-Voltage Lock-Out (UVLO) protection
• Soft-Start Function with charge pump
• Adjustable current up to 1.2A
• Open LED protection
• High frequency (60kHz) constant current driver
• Wide 4.5V to 36V input voltage range
• Smart thermal current shutdown
• Small 8-pin NSOP and 8-pin TSSOP packages

TLD1211SJFUMA1 Applications

TLD1211SJFUMA1 is designed for LED backlighting for LCD display and general LED lighting applications. It is suitable for LED TV backlighting, LED lamp, LED lighting modules and modules applications, etc. This LED driver is also suitable for various AC/DC adapter, battery-powered and other LED illuminating applications. It can work with other types of low current LED strings up to 24V, such as infrared LEDs, UV LEDs and white LEDs.

Working Principle of TLD1211SJFUMA1

TLD1211SJFUMA1 can provide a constant current to a string of connected LEDs. To achieve this, the device employs a step-up (boost) converter with integrated P-Channel MOSFET and an adjustable current sink. The boost converter works on the principle of ‘flyback’ converter and is usually used in offline LED lighting applications.

The device consists of control, switch and rectifier blocks. The flyback input voltage is stepped up to the internal voltage (VIN) level required for the internal linear current sink to regulate the desired output current. The internal linear feedback works on error signal generated from the sensed current and drives the P-Channel MOSFET. Connected to the primary winding is the internal P-channel MOSFET which will switch when the sensing block reaches the programmed current level.

The P-channel MOSFET is charge-filled during the off-time of the switching cycle and is completely discharged with time during on-time of the switching cycle. This results in current through the LEDs. The current is sensed across the sense resistor and regulated with PWM (pulse-width modulation). The external resistor R1 is used to adjust the LED current.

Once the output voltage reaches a certain level, the LED current will start to flow like a fixed step-down converter, where LED current is regulated by the internal linear feedback. This principle of operation ensures constant current regardless of the load and input voltage variations.

Conclusion

TLD1211SJFUMA1 from TI is an adjustable high performance LED driver. It features a wide input voltage range, adjustable current up to 1.2A, soft–start, open LED protection and input Under-Voltage Lock-Out (UVLO) protection. TLD1211SJFUMA1 is designed for LED lighting applications such as LED TV backlighting, LED lamp, LED lighting modules and modules applications, etc. Its flyback control principle ensures constant current even under load variations.

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