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PDF G5524A Data sheet ( Hoja de datos )
| Número de pieza | G5524A | |
| Descripción | Integrated Power Supply | |
| Fabricantes | Global Mixed-mode Technology | |
| Logotipo |  |
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Global Mixed-mode Technology Inc.
G5524A
Integrated Power Supply for TFT-LCD Panels with
4-Channel White LED Driver
Features
2.5V to 5.5V Input Supply Range
Boost Regulator
640kHz/1.2MHz Fixed Frequency
Current-Mode Control
Fast Transient Response to Pulse Load
±1% Accurate Output Voltage
Built-In 20V/2A, 0.2Ω N-Channel MOSFET
High Efficiency up to 90%
Programmable Soft-Start
Over-Current Protection
Output Under-Voltage Protection
White-LED Driver
Wide 4.2V to 24V Input Supply Range
Adjustable Switching Frequency
40V/2A, 0.3Ω n-channel MOSFET
Input Under-Voltage Protection
Over Current Protection
Over Voltage Protection
Maximum Programmable LED Channel Current
50mA
Maximum 3% Matching between Channels
100Hz~20kHz PWM Dimming
High-Performance Operational Amplifiers
±150mA Output Short-Circuit Current
12V/µs Slew Rate
12MHz, -3dB Bandwidth
Rail-to-Rail Input and Output
Low Dropout Voltage Linear Regulator
350mA Maximum Output Current
Adjustable Output Voltage
On-Chip GPM Controller
Adjustable Falling Time and Power-On Delay
Flicker Compensator
Power-On Sequence Control
Charge pump for VGH regulation
Low Voltage Detector
Programmable Detecting Voltage and Delay Time
Thermal Protection
RoHs Compliant
TQFN5X5-40 and TQFN3.8X6.2-44 Package
Applications
Notebook Computer Displays
UMPCs
LCD Monitor
General Description
The G5524A 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 dis-
plays (LCDs).
The boost converter provides the regulated supply volt-
age for the panel source driver ICs. The converter is a
high switching frequency (640kHz or 1.2MHz) cur-
rent-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 re-
sponse 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 pro-
grammed by external capacitor, which sets the in-
put-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 cur-
rent. 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 inter-
nal 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 con-
troller 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 ca-
pacitor.
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 in-
put/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 refer-
ence.
Ver: 0.2
Feb 16, 2011
TEL: 886-3-5788833
http://www.gmt.com.tw
1
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| Páginas | Total 2 Páginas | |
| PDF Descargar | [ Datasheet G5524A.PDF ] | |
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