LYT1603D

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LYT1603D is a PMIC (Power Management IC) and LED driver, which is capable of driving up to two strings of LEDs in parallel. It features an adjustable current regulator to enable optimal brightness control of the LEDs while maintaining their reliability. This IC is available in variety of packages and is suitable for a wide range of applications, including automotive lighting, LCD backlighting, decorative lighting, and display modules.

Features

• Operate up to two strings of LEDs in parallel
• Adjustable current regulator for brightness control
• Ultra low standby current for improved system power efficiency
• Superior stability and accuracy of the LED current
• High operating and storage temperature range
• Highly integrated architecture for simple system integration
• Wide input voltage range for power efficiency and flexibility

Applications

• Automotive lighting
• LCD backlighting
• Decorative lighting
• Display modules

Working Principle

The LYT1603D is a buck-boost LED driver with a wide input voltage range, up to 35V. The presence of two strings of LEDs with adjustable current output enables the design to be optimized for high power efficiency. The primary flow of electricity is from the input voltage, through the output filter, to the LEDs in series. The adjustable current regulator can be used to set the output current to the desired level, which subsequently determines the final output voltage.

Besides the adjustable current regulator, the LYT1603D consists of an output control die, a switching regulator, control circuits, an internal oscillator, and an output filter for the voltage regulation. The output control die consists of error amplifiers, voltage reference, and logic control circuits to complete the regulation of the output. The switching regulator is powered by the oscillator. The control circuits convert the current command of the error amplifier into drive signal for the switching regulator. The output filter smoothes out the output voltage.

The adjustable current regulator inside the IC is the main control of the device. It contains an error amplifier with gain and an adjustable current register. The output current of the device is set by the current register. The output current will start to increase when the control voltage (VCTRL) is applied to the current register. The output current will stop increasing when the error amplifier detects that the output voltage (VOUT) is equal to the reference voltage (VREF). The current register can be controlled through an external resistor network to set the output current.

Conclusion

The LYT1603D is a PMIC and LED driver designed to operate up to two strings of LEDs in parallel. It features an adjustable current regulator for optimized brightness control of the LEDs while maintaining their reliability, as well as a wide input voltage range for power efficiency and flexibility. The IC is suitable for a wide range of applications, including automotive lighting, LCD backlighting, decorative lighting, and display modules.

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