BCD recently introduced the innovative design of the tandem white LED driver AP3036. The AP3036 provides a simple pulse dimming technology up to 100KHz. The system can easily adjust the output brightness by providing wide and narrow digital pulses. It also incorporates a Schottky diode (Diode) into the circuit, resulting in fewer system components and less RF interference.
Currently portable electronic LCD screen backlight based mainly white LED, white LED with luminance proportional to the current, AP3036 architecture provides series type LED, may be provided in series up to a desired voltage 8 white LED, and may be connected in series A resistor to set the maximum LED current, the function can cover all the small size LCD screen backlight required, and ensure the uniformity of LED brightness. The biggest advantage of the AP3036 is that it can adjust the brightness of the LED with PWM signal. The dimming frequency range is very wide and can reach 100KHz. When the AP3036 uses the frequency above 20KHz to adjust the LED brightness, the audio range can be skipped, so the audio interference is smaller and the EMI is more. it is good.
Figure 1. Typical application of the AP3036/A
The AP3036 has a conversion efficiency of up to 82% and a minimum operating voltage of 2.5V, which reduces current consumption and extends battery life. The built-in Schottky diode reduces the components and complexity required for the system. The built-in Soft start function reduces Inrush current, overvoltage protection (OVP) and overcurrent protection (OCP) to determine that the system is operating under normal conditions.
The AP3036 is available in SOT23-6 and TSOT-23-6 packages and is available in 200mV and 250mV versions (AP3036A). Both versions are currently in volume production and are sampling and the Demo Board.
Introduction to AP3036
AP3036 is BCD's latest LED backlight dedicated drive control chip, which uses inductor structure current mode boost control to provide ideal LED constant current function and excellent regulation. The AP3036 uses a series LED structure to drive up to 8 LEDs, and a constant current function of the LED is achieved through a current sense resistor. With an input voltage range of 2.5V to 16V, a single-cell battery or multiple cells can be used in series to power the system.
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