TC962EPA

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TC962EPA is a monolithic boost circuit especially suitable for LED driver supply. This device features integrated high voltage power transistors, switching current regulator and temperature limiting circuit. Its regulating algorithm together with the special startup circuit offers good dynamic performance, high efficiency, and low output voltage ripple. It offers significant advantages compared with the complex traditional boost topology and drives 1W LED, especially suitable for thick film code applications.

Application Field

The TC962EPA is designed for LED driver supply:

• Small Application Circuits
• Portable Electronics
• Internet of Things (IOT)
• Home Appliances
• LED Lighting Systems

Working Principle

The TC962EPA features a boost topology with current regulation. Its basic operating principle is very straightforward and best understood by referring to the simplified schematic diagrams on the following pages. In operation, the oscillator generates an internal triangular waveform that controls the switching times of the internal power transistors.

The current in the inductor is sensed by the internal current sense resistor RN. The error amplifier compares the sensed inductor current to its reference voltage and adjusts the duty cycle of the oscillator accordingly. When the switch is ON, the inductor current increases until the switching current is approximately equal to the reference level.

By sensing the voltage across the switch, the device limits the peak current in the inductor. The boost converter will be in over-current protection and the output voltage will be lower than the programmed value. When the switch is OFF, the inductor current flows from the inductor to the output capacitor and C6 provides the start-up current.

The charge/discharge of the external capacitor CFLY is regulated by the internal loop control. In the "fixed frequency" mode, at each switching cycle, this capacitor acquires a certain amount of charge to the output. This is a critical aspect to the performance of the boost converter.

The output of the boost converter is stabilised by the temperature limiting circuit, providing improved stability and noise immunity. The temperature limiting circuit senses the junction temperature of the internal power transistors and shuts down the oscillator if the temperature exceeds the programmed value. This feature also limits the average current in the inductor and provides short-circuit protection.

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