A8500EECTR-T Integrated Circuits (ICs)

Series:	--
Packaging:	Tape & Reel (TR)
Lead Free Status / RoHS Status:	--
Part Status:	Active
Moisture Sensitivity Level (MSL):	--
Type:	DC DC Regulator
Topology:	Step-Up (Boost)
Internal Switch(s):	Yes
Number of Outputs:	8
Voltage - Supply (Min):	4.2V
Voltage - Supply (Max):	5.5V
Voltage - Output:	--
Current - Output / Channel:	25mA
Frequency:	2MHz
Dimming:	Analog, Multi-Step, PWM
Applications:	Backlight
Operating Temperature:	-40°C ~ 85°C (TA)
Mounting Type:	Surface Mount
Package / Case:	26-WFQFN Exposed Pad
Supplier Device Package:	26-QFN/MLP (4x4)
Base Part Number:	A8500

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Introduction

A8500EECTR-T, PMIC LED drivers, is a family of LED drivers designed to provide accurate current regulation for LED strings up to 35 V. The device features high-accuracy fixed-current regulation, programmable current-setting, power factor correction, and thermal Protection. The device also includes a synchronous rectifier to reduce switching losses, a shot-circuit protection, an open-LED detection output, and a VDD frequency adjustment feature to reduce ripple and noise.

Application fields

A8500EECTR-T device is used extensively in the wide variety of markets, including general-purpose lighting applications, automotive lighting, architectural lighting, signage and displays,etc. A8500EECTR-T devices are also used in the industrial lighting. The device helps to provide the highest level of efficient power delivery and EMC/EMI compatibility.

Working Principle

At the heart of the A8500EECTR-T is a proprietary control architecture that takes all control functions into account when regulating the current. The architecture has been designed to provide a fast and accurate control strategy. The device is capable of regulating current to the load at various output voltages, depending on the output capacitor and load resistance. The current regulation loop of the A8500EECTR-T is composed of a voltage-controlled current source loop, sense resistor and compensation loop. The current source loop generates the desired current setpoint from the internal voltage reference, which is generated from the voltage control loop. This setpoint is then compared to the sensed current from the sense resistor to calculate the output voltage for the load. The output voltage is adjusted by the compensator loop until the current setpoint and sensed current match. The output of the current source is used to drive the power MOSFETs inside the device, to achieve a high system efficiency. The device also includes an internal circuit to sense the output voltage, which is used to protect the device from over-voltage conditions. The device is powered by the input voltage and is designed to operate over a wide range of input voltages up to 35V. The power-up sequence is designed to reduce the inrush current and ensure a fast recovery time.

Conclusion

The A8500EECTR-T is a highly efficient, accurate LED current regulator designed with features to optimize LED performance. The device is optimized for LED load regulation and thermal protection. The device is capable of providing efficient, accurate and stable current output to LED strings up to 35V. The device is used extensively in a wide variety of markets, such as general-purpose lighting, automotive lighting, architectural lighting, signage, and displays. The device has a control architecture providing fast, accurate control and its power-up sequence reduces inrush current and ensures a fast recovery time.

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