|
|
PDF EUP2619 Data sheet ( Hoja de datos )
| Número de pieza | EUP2619 | |
| Descripción | TFT LCD DC-DC Converter | |
| Fabricantes | Eutech Microelectronics | |
| Logotipo |  |
|
Hay una vista previa y un enlace de descarga de EUP2619 (archivo pdf) en la parte inferior de esta página. Total 14 Páginas | ||
|
No Preview Available !
Preliminary
EUP2619
TFT LCD DC-DC Converter with Integrated
Charge Pumps and OP-AMP
DESCRIPTION
The EUP2619 generates power supply rails for thin-film
transistor (TFT) liquid-crystal display (LCD) panels in
tablet PCs and notebooks operated from 2.5V to 5.5V input
supply. The device integrates a step-up converter, positive
and negative charge pumps, and a high speed VCOM buffer.
The external compensated step-up converter, providing the
regulated supply voltage for the panel source driver ICs,
features an internal power MOSFET and high frequency
operation allowing to use small inductors and capacitors.
The step up converter uses fixed-frequency peak current
mode control architecture which provides fast
load-transient response and easy compensation. A 2.8A
peak current limit for the internal switch protects power
supply fault condition.
The regulated positive and negative charge pump regulators
generate the positive and negative supply rails for the TFT
LCD gate resistive voltage-divider ICs.
The high speed VCOM buffer features 500mA short circuit
current, 20MHz bandwidth, fast slew rate 45V/µs, and
rail-to-rail inputs and outputs.
The EUP2619 includes internal power-up sequencing,
over/under voltage protections of the boost converter, and
over temperature protection to ensure in safe operating.
The EUP2619 are available in a 16-pin 3mm × 3mm TQFN
packages.
Typical Application Circuit
FEATURES
2.5V to 5.5V Input Supply Range
1.2MHz Current-Mode Step-Up Converter
- Built-In 20V/2.8A, 0.16Ω N-Channel MOSFET
- High Efficiency Up to 90%
- ±1% Accurate Output Voltage
- Fast Transient Response to Pulse Load
- Over-Current Protection
- Output Under-Voltage Protection
600kHz Negative Charge Pump Driver for VGL
600kHz Positive Charge Pump Driver for VGH
High Speed High Current 18V VCOM Buffer
- ±500mA Output Short-Circuit Current
- 45V/µs Slew Rate
- 20MHz, -3dB Bandwidth
- Rail-to-Rail Input and Output
Power-On Sequence Control
Thermal-Overload Protection
3mm × 3mm TQFN-16 Package
RoHS Compliant and 100% Lead (Pb)-Free
Halogen-Free
APPLICATIONS
Tablet PCs
Notebook Displays
DS2619 Ver0.1 Nov. 2011
Figure 1.
1
1 page  
Tel: 0755-8398 3377 / 135 9011 2223
http://www.gofotech.com
Preliminary
EUP2619
Electrical Characteristics (Continued)
VIN= 3.3V,VOUT=8.5V. TA=-40°C to +85°C.Typical values are at TA=+25°C.Unless otherwise noted.
Symbol
Parameter
Conditions
EUP2619
Min. Typ. Max.
Main Step-Up Regulator
VOUT
VFB
Gm
Output Voltage Range
Feedback Voltage
FB Load Regulation
FB Line Regulation
FB Input Bias Current
Transconductance of Error
Amplifier
No load
0<ILOAD<Full, transient only
VIN=2.5V to 5.5V
VFB=1.2V
VIN 18
1.188 1.2 1.212
-1
0.08 0.15
50 125 200
75
RLX(ON)
LX ON-Resistance
Current Sense
Transconductance
ILX=200mA
0.16 0.25
3.3 5 10
ILIM Current Limit
N-MOSFET Leakage Current VLX=19V
Soft-start period
7 bit current ramp
2.8
10 20
8
VCOM Buffer
VSUP
IOP
VOS
IBIAS
VOH
Supply Voltage Range
VSUP Undervoltage Threshold
Supply Current
Input Offset Voltage
Input Bias Current
Input Common Mode Voltage
Range
Input Common Mode
Rejection Ratio
Output Voltage Swing High
Buffer configuration,
VOPAI=VSUP/2, no load
VOPAO, VOPAI=VSUP/2, TA=25ºC
VOPAO, VOPAI=VSUP/2
IOUT=1mA
IOUT=50mA
6
3.8 4
4
-1
0
VSUP-
50
VSUP-
300
80
18
4.2
6.5
8
1
VSUP
VOL Output Voltage Swing Low
Short-Circuit Current
IOUT=-1mA
IOUT=-50mA
Sourcing
Sinking
50
300
500
500
F3dB -3dB Bandwith
20
SR Slew Rate
45
Large Signal Voltage Gain
Gate-High Regulator
VOUT=1V to (VSUP-1)V
80
VSUP Input Supply Range
VSUP Over Voltage Threshold
FBP Line Regulation Error
FBP Input Bias Current
DRVP Current Limit
VSUP=Rising, Hystersis=200mV
VSUP=8V to 18V, VGH=15V
VFBP=1.5V
Not in dropout
6
19 20
-50
400
18
21
0.2
50
VFBP
RONP_P
RONP_N
Feedback Reference Voltage
DRVP Switch On-Resistance
No load
1.176 1.2 1.224
46
1.5 3
Unit
V
V
%
%/V
nA
µA/V
Ω
A/V
A
µA
ms
V
V
mA
mV
µA
V
dB
mV
mV
mA
MHz
V/µs
dB
V
V
%/V
nA
mA
V
Ω
DS2619 Ver0.1 Nov. 2011
5
5 Page 
Tel: 0755-8398 3377 / 135 9011 2223
http://www.gofotech.com
Preliminary
EUP2619
Function Description
The EUP2619 contains a high performance current mode
boost regulator, a gate-on charge pump driver and a
gate-off charge pump driver. It also includes of a
high-current rail-to-rail operation amplifier. The
following content contains the detailed description and
the information of the component selection.
Step-Up Converter
The Step-up regulator is a high efficiency current-mode
PWM architecture with 1.2MHz operation frequency. It
performs fast transient responses to generate source
driver supplies for TFT LCD display. The high operation
frequency allows smaller components to minimize the
thickness of LCD panel. The Step-up Converter can
operate in continuous conduction mode and steady state
operation, where the inductor current is continuously. In
the first half cycle, the power MOSFET is on and
Schottky diodes are reverse biased, the output current is
provided by output capacitor, inductor voltage is VIN,
and its current increase at the rate of VIN/L; during the
other half cycle, MOSFET is off and Schottky diodes are
forward biased, the energy stored in the inductor is
released. The inductor current ripple is:
∆I L
=
∆T2
×
VIN
− VOUT
L
1- D
∆T2 =
F
SW
Where L is self-inductance, the energy of inductor is
stored by electromagnetic induction.
In the steady state operation, the energy stored in
inductor must be converted equally, so the inductor
current ripples in two half cycle are identical.
D × VIN + 1 − D × VIN − VOUT = 0
F
SW
L
FSW
L
V
OUT =
1
V 1−D
IN
Output Voltage
The output voltage is reduced to a reference voltage
1.2V by external feedback resistor divider. The resistors
maximum value is limited by feedback output biased
current and potential coupling noise of feedback pin.
Output voltage of Step up Converter can be set
according to the following equations:
VOUT
= 1.2 × 1 +
R1
R2
The recommended range of R2 is from 10kΩ to 50kΩ.
Place the resistor divider as close as possible to the chip
can reduce noise sensitivity.
Inductor Selection
The output voltage ripple, transient response, capacity
and efficiency of output current supply are decided by
inductor selection and the inductor value is influenced
by input and output voltage, switching frequency and the
maximum output current. A 4.7µH or 10µH inductor is
recommended for small ripple applications.
Output Capacitor Selection
Small value of ESR capacitor can minimum the output
voltage ripple. So it is recommended that multi-layer
ceramic capacitors（X5R or X7R）are used to be output
capacitor because of its low ESR characteristics and
small size in package. ESR determines the output
voltage ripple according to the equation:
∆VO
=
IO
FSW
×D
× CO
+ IO
× ESR
Diode Selection
Schottky diodes, with their low forward voltage drop
and fast reverse recovery, are the ideal choices for
EUP2619 applications. It must be chosen correctly
depending on some parameters such as reverse
breakdown voltage, forward current and forward voltage
drop. A Schottky diode rated at 3A is sufficient for most
EUP2619 applications.
Input Capacitor Selection
Input capacitors, which are decided by input and output
voltage, maximum output current, inductor and supply
noise, are important in restraining input voltage ripple
and enhancing chip performance. In most application, a
20µF capacitor is suitable. Care must be taken to make
sure that chip is normal operated, a 10Ω resistor and a
1µF bypass capacitor should be taken next to the VIN
pin to decrease the high frequency noise of power wire.
Loop Compensation
The feedback loop of EUP2619 contains a trans-
conductance amplifier, which makes the chip achieve
better transient response and regulation. The EUP2619
employs current mode control architecture, which
features rapid current sense loop and slow voltage
feedback loop. Compensation is not required for rapid
current sense loop but is necessary for slow voltage
feedback loop to insure that the device is in the steady
state. RC network connected between the COMP pin and
AGND is a compensation network. In the network,
resistors play a decisive role in achieving a high gain of
high-frequency and obtain fast transient response.
Capacitor sets the zero of the integrator. Assuring about
loop stabilization, capacitor must be chosen between
220pF~10nF and resistor must be chosen accurately in
the range of 2kΩ ~100kΩ.
DS2619 Ver0.1 Nov. 2011
11
11 Page | ||
| Páginas | Total 14 Páginas | |
| PDF Descargar | [ Datasheet EUP2619.PDF ] | |
Hoja de datos destacado
| Número de pieza | Descripción | Fabricantes |
| EUP2619 | TFT LCD DC-DC Converter | Eutech Microelectronics |
| EUP2619JIR1 | TFT LCD DC-DC Converter | Eutech Microelectronics |
| Número de pieza | Descripción | Fabricantes |
| SLA6805M | High Voltage 3 phase Motor Driver IC. |
 Sanken |
| SDC1742 | 12- and 14-Bit Hybrid Synchro / Resolver-to-Digital Converters. |
 Analog Devices |
|
DataSheet.es es una pagina web que funciona como un repositorio de manuales o hoja de datos de muchos de los productos más populares, |
| DataSheet.es | 2020 | Privacy Policy | Contacto | Buscar |