LED backlight driver power scheme

19/apr/2012 07.52.20 bathroom Contatta l'autore


Portable electronic products, LCD screen backlight is white LED-based white LED brightness as the current is proportional to the AP3036 series type LED structure, can provide up to eight white LED tube series required voltage, AP3036 largest The advantage is that you can use the PWM signal to adjust the LED brightness dimming frequency range is very wide and can go to 100KHz, when the AP3036 use 20KHz frequency to adjust the LED brightness, you can skip the audio range, audio interference, EMI better.
LED = Light Emitting Diode light emitting diode, the ability to convert electrical energy into visible light solid-state semiconductor devices, it can direct electricity into energy saving lamp; LED = Large ElectrONic Display, large electronic display; the LED = lupus erythematosus disseminatus broadcast Divergence of lupus, a chronic, idiopathic autoimmune disease; LED is the lead of the past and past participle, meaning "leadership, and lead"; Russia's Pulkovo Airport IATA code. This entry introduces a light-emitting diodes.
AP3036's highest conversion efficiency can reach 82%, the minimum operating voltage of 2.5V, and can reduce current consumption and extend battery life, built-in Schottky diode to reduce the required components and complexity. Built-in soft-start (Soft STart) function can reduce the intrusion current (Inrush current), over-voltage protection (OVP) and overcurrent protection (OCP) can determine the normal state.
AP3036 SOT23-6 and TSOT-23-6 in two packages, and of 200mV version and the 250mV version (AP3036A), these two versions are already in mass production, and the provision of samples and the Demo Board.
AP3036 Introduction
The AP3036 is the the BCD latest special LED Light drive control chip inductor structure of current-mode boost control, provides an ideal LED constant current function and regulation. The AP3036 series LED structure can drive up to 8LED LED constant current through a current sense resistor. The input voltage range of 2.5V to 16V, you can use a single battery or multiple batteries connected in series to the system power supply.
AP3036 maximum operating frequency of 1.0MHz, so can significantly reduce the external device parameters and dimensions of a typical 1mm 22uH inductor and 0.22uF output capacitance to meet the normal conditions of use.

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