Купить Микросхема CM501 QFN-48 2 шт.
PMIC for LCD TV / Monitor
General Description
The CM501 generates all the supply rails for thin-film transistor (TFT) liquid-crystal display (LCD) panels in TVs
and Monitors. It includes boost and buck regulators, VGH and VGL charge pump regulators, gate pulse modulator
(GPM) , HV LDO, voltage detector (XAO) and VCOM OP. The CM501 can support input voltage from 8V to 14V and
is optimized for LCD TV panel and LCD monitor applications running directly from 12V supply. The boost and buck regulators feature internal power MOSFETs and high-frequency operation allowing the use of small inductors and capacitors, resulting in a compact solution. Both switching regulators use fixed-frequency, current-mode control architectures, providing fast loadtransient response and easy compensation. The VGH and VGL charge-pump regulators provide supply voltages for TFT gate driver. Both output voltages can be adjusted with external resistive voltage dividers. The GPM is controlled by frame signals from timing controller to modulate the Gate-On voltage (VGHM), which acts as a flicker compensation to reduce the coupling effect between gate lines and pixels. It also can delay VGHM while power-on for achieving a correct power-on sequence for gate driver ICs. VGHM power-on delay time, the falling time and falling stop voltage can be programmable by an external capacitor and an external resistor.
The voltage detector (XAO) monitors VIN voltage to issue a reset signal while the detected voltage is too low. The
detecting level is decided by an external resistive voltage divider. The HV LDO can provide a highly accurate voltage (0.5%) for gamma reference voltage. It has fast transient response and also wide operation input range. The VCOM OP can drive the LCD VCOM voltage that features high short-circuit current (300mA), fast slew rate (45V/μs), wide bandwidth (20MHz) and rail-to-rail inputs and outputs. The CM501 is available in a small WQFN-48L 7x7 package and operates over the -40°C to +85°C temperature range.
Features
8V to 14V Supply Input Voltage Range
Current-Mode Boost Regulator
20V 3.5A 0.1Ω Internal N-MOSFET
Programmable Over Current Protection Voltage
±1% Accurate Output
Progremmable Soft-start
Line Regulation 0.15%/V
Load Regulation ±1%/A
External Compensation
Current-Mode Buck Regulator
16.5V 3.2A 0.15Ω Internal N-MOSFET
Over Current Protection
Adjustable Output Voltage from 1.8V to 3.3V
±1% Accurate Output
Line Regulation 0.1%/V
Load Regulation ±0.5%/A
Internal Compensation
Internal Soft-start
Adjustable VGH Charge Pump
±2% Accurate Output
Continuous Output Current 50mA
Adjustable VGL Charge Pump
Accurate Output Controlled by ( REF− FBN )
Continuous Output Current 50mA
Gate Pulse Modulator
18V to 35V Positive Supply Input
Flicker Compensation
Power-On/Off Sequence Control
On-Chip GPM Controller with Adjustable Falling
Time and Falling Stop Voltage
Voltage Detector (XAO)
Adjustable Detecting Voltage (±1%)
N-Channel Open-Drain Output
VCOM OP
5V to 20V Input Supply Voltage
±300mA Output Short-Circuit Current for 1ms
45V/μs Slew Rate
20MHz, −3dB Bandwidth
Rail-to-Rail Input/Output
Комментарии