Integrated Power Supply for TFT-LCD Panels with 4-Channel White LED Driver CXLC8996A includes a high-performance boost regulator, 4-channel LED driver, a low dropout linear regulator (LDO)

   产品概述 返回TOPdUe嘉泰姆

The CXLC8996A includes a high-performance boost regulator, 4-channel LED driver, a low dropout linear regulator (LDO), a gate pulse modulator (GPM), a voltage detector, a VCOM buffer (unity-gain OPA), and a VGH charge pump controller for active-matrix thin-film transistor (TFT) liquid-crystal displays (LCDs). The boost converter provides the regulated supply voltage for the panel source driver ICs. The converter is a high switching frequency (640kHz or 1.2MHz) current-mode regulator with an integrated 20V N-Channel 0.2Ω MOSFET that allows the use of ultra-small inductors and ceramic capacitors. It provides fast transient response to pulsed loading while achieving efficiency over 90%. The device can produce output voltage as high as 18V from an input as low as 2.8V. Soft-Start is programmed by external capacitor, which sets the input-current ramp-rate. The LED driver automatically regulated supply voltage for the LED light bars without the need to calculate the output for different LED types. A FREQ2 pin is applied to adjust switching frequency in the range of 640kHz to 2MHz. It also integrates a 40V n-channel MOSFET that provides high output power. The 4-channel current driver is ideal for constant current driving, and, well matched less than 3%. To set the maximum driving current, the ISET pin is used to determine reference current. Each channel of the current drivers is set to 1300 times of this reference current. A PWM pin can be used to perform PWM dimming from the range of 100Hz to 20kHz. Open LED-string automatically disable the channel from entering over voltage protection. The low-dropout (LDO) linear regulator can supply up to 350mA current while input voltage is 3.3V. It uses an internal PMOS as the pass device. It is suitable for the supply voltage of the timing controller. The GPM is controlled by frame signals from timing controller to modulate the Gate-On voltage, VGHM, which acts a flicker compensation circuit to reduce the coupling effect between gate lines and pixels. It also can delay the Gate-On voltage while power-on for achieving a corrected power-on sequence for gate driver ICs. Both of power-on delay time and the falling time of the Gate-On voltage are programmable by external capacitor and resistor. The voltage detector monitors the supply voltage to issue a reset signal while the detected voltage is too low. The detecting level is decided by an external resistor divider and the delay time is programmable by an external capacitor. The VCOM buffer can drive the LCD VCOM voltage that features high short-circuit current (150mA), fast slew rate (12V/μs), wide bandwidth (12MHz) and rail-to-rail input/output. The VGH charge pump controller provides regulated TFT Gate-On voltage. The regulation of the positive charge pump is generated by the internal comparator that senses the output voltage and compares it with an internal reference.

   产品特点 返回TOPdUe嘉泰姆

„ 2.5V to 5.5V Input Supply Range dUe嘉泰姆

„ Boost Regulator dUe嘉泰姆

Š 640kHz/1.2MHz Fixed Frequency dUe嘉泰姆

Š Current-Mode Control dUe嘉泰姆

Š Fast Transient Response to Pulse Load dUe嘉泰姆

Š ±1% Accurate Output Voltage dUe嘉泰姆

Š Built-In 20V/2A, 0.2Ω N-Channel MOSFET dUe嘉泰姆

Š High Efficiency up to 90% dUe嘉泰姆

Š Programmable Soft-Start dUe嘉泰姆

Š Over-Current Protection dUe嘉泰姆

Š Output Under-Voltage Protection dUe嘉泰姆

„ White-LED Driver dUe嘉泰姆

Š Wide 4.2V to 24V Input Supply Range dUe嘉泰姆

Š Adjustable Switching Frequency dUe嘉泰姆

Š 40V/2A, 0.3Ω n-channel MOSFET dUe嘉泰姆

Š Input Under-Voltage Protection dUe嘉泰姆

Š Over Current Protection dUe嘉泰姆

Š Over Voltage Protection dUe嘉泰姆

Š Maximum Programmable LED Channel Current 50mA dUe嘉泰姆

Š Maximum 3% Matching between Channels dUe嘉泰姆

Š 100Hz~20kHz PWM Dimming dUe嘉泰姆

„ High-Performance Operational Amplifiers dUe嘉泰姆

Š ±150mA Output Short-Circuit Current dUe嘉泰姆

Š 12V/μs Slew Rate dUe嘉泰姆

Š 12MHz, -3dB Bandwidth dUe嘉泰姆

Š Rail-to-Rail Input and Output dUe嘉泰姆

„ Low Dropout Voltage Linear Regulator dUe嘉泰姆

Š 350mA Maximum Output Current dUe嘉泰姆

Š Adjustable Output Voltage dUe嘉泰姆

„ On-Chip GPM Controller dUe嘉泰姆

Š Adjustable Falling Time and Power-On Delay dUe嘉泰姆

Š Flicker Compensator dUe嘉泰姆

Š Power-On Sequence Control dUe嘉泰姆

„ Charge pump for VGH regulation dUe嘉泰姆

„ Low Voltage Detector dUe嘉泰姆

 Š Programmable Detecting Voltage and Delay Time dUe嘉泰姆

„ Thermal Protection dUe嘉泰姆

„ RoHs Compliant dUe嘉泰姆

„ TQFN5X5-40 and TQFN3.8X6.2-44 PackagedUe嘉泰姆

   应用范围 返回TOPdUe嘉泰姆

„ Notebook Computer Displays dUe嘉泰姆

„ UMPCs dUe嘉泰姆

„ LCD MonitordUe嘉泰姆

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