A8503EECTR-T Integrated Circuits (ICs)

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Introduction

A8503EECTR-T is a PMIC (power management integrated circuit) – LED driver, which is one of the importance products of Dialog Corporation. A8503EECTR-T provides the constant current driving capability to power the LEDs, including high brightness and organic LEDs. It is certificated by C.I.A.E, an agency aheaded by Chinese Academy of Sciences.

Application Field

A8503EECTR-T could primarily be utilized in the application which requires power management solution. For example, it can be found in lighting industry such as industrial lighting, commercial lighting, automotive lighting and home appliances, or it can be used in fields like Backlighting for Displays, Portable Lighting, LED driver for Portable Device and LED Lighting.

Features

A8503EECTR-T offers some useful features:

• Two 3.2 MHz switch mode DC-DC converters for efficiency up to 91%;
• Two configurable 0.3 A or 0.6 A current sink;
• Integrated over temperature and over voltage protection;
• Soft start and soft disabled;
• Power-on-OFF LED current ramp;
• Transistor gate turn-off time trimming;
• PWM dimming.

Working Principle

The basic architecture of a switching regulator is shown in the block diagram. An input voltage (Vin ) is connected to the power stage. The power stage includes a power switch, a rectifier for conducting current in only one direction and inductor for storing energy. The output voltage is determined by the electrical components connected in the power stage. The regulation of the output voltage is done by forming an output voltage feedback loop. This feedback loop is composed of an error amplifier, current sensing and over-voltage protection of output voltage.

The power switch (usually a FET transistor) is turned on under the control of the oscillator to supply current to the load through the rectifier and inductor. This inductor stores energy when the power switch is in the ON-state and it releases energy for the load during the OFF-state. An internal control circuit is used to adjust the frequency of the oscillator and to control the on/off duty cycle of the power switch. When the current sensor senses a change in current, it sends a signal back to the control circuit to adjust the frequency of the oscillator, resulting in a change in the on/off duty cycle and, thus, controlling the output voltage.

In addition to its primary role in providing power for the loads, the switching DC-DC converter also has several other functions, such as UVLO detection, overvoltage protection, overcurrent protection, short-circuit protection and thermal protection.

Conclusion

A8503EECTR-T, as a protocol of Dialog Corporation’s PMIC – LED drivers, carries great application potential in the lighting and display industry, such as industrial lighting, commercial lighting, automotive lighting and home appliances. Besides, by providing the high efficiency switch mode DC-DC converters, over temperature protection, soft start and soft disable, current sensoring and more, it can be a reliable choice for application that requires power management solution.

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