ANX6930数据手册HYSiC中文资料规格书

描述 Description

The ANX6930 is a highly compact white LED driver especially optimized for thin-film transistor (TFT) liquid crystal displays (LCDs) backlight. The chip can drive up to six strings of LEDs and up to 10 LEDs in series per string.

    The device offers a built-in high efficiency current mode boost converter. The six integrated current sink regulators provide high precision current regulation and matching for LED currents up to 60mA. The feedback loop senses LED current sink voltages and compensates for the non-uniformity of the LED forward voltage accumulated on the LED strings. To minimize the power loss, the output voltage of the boost converter is automatically adjusted by monitoring the highest forward voltage of the LED strings. An unused LED channel can be disabled by connecting the channel to ground.

     The ANX6930 controls LED dimming from PWM interface and supports direct dimming mode, mixed dimming mode, and programmable output frequency dimming mode. In direct PWM mode, the LED current is turned on and off in response to the duty cycle and frequency applied at the PWM pin. In mixed dimming mode, the input PWM duty cycle information is translated to analog signal to control the LED current linearly over 25% to 100% input PWM duty. In programmable output frequency dimming mode, the LED current of each channel is turned on and off based on the duty controllered by the input PWM signal, but the frquency is determined by the resistor on RFPWM pin. Auto phase shift dimming is applied in this mode, each channel is shifted accordingly.

     The ANX6930 features overcurrent protection (OCP), overtemperature protection (OTP), overvoltage protection (OVP), and LED string open and short detection. Once the device is turned on, the soft-start function raises the output voltage gradually to avoid voltage overshoot and inrush current.

特性 Features

• Wide input range from 4.2V to 24V\r
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• Integrated 2A/45V boost converter FET\r
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• Built-in loop compensation and soft-start\r
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• Programmable Boost Switching Frequency from 300kHz to 1MHz\r
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• Auto-adjusted Boost Output Voltage\r
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• Three Optional Dimming Method\r
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• Direct PWM Dimming \r
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• Mixed Dimming Mode\r
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• Programmable Output Frequency\r
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• Six programmable Current Sinks\r
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- Up to 40mA Current per Channel\r
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- 1% Minimum Dimming Duty Cycle\r
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- Input PWM Glitch Filter\r
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- 1.5% Current Matching (typical)\r
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• Protection:\r
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- LED String Open/Short Detection\r
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- Over-voltage Protection \r
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- Over-current Protection\r
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- Over-temperature Protection\r
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• Thin 4mm x 4mm 20-lead WQFN package\r
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• RoHS compliant and 100% Lead(Pb)-Free/Green

应用 Application

Notebook/Ultrabook/Tablet PC Display
Car Navigator/Entertainment Display