EUP2683 Datasheet, PDF (1/1 Pages) Eutech Microelectronics Inc – Multi-Output Power Supplies

EUP2683
Multi-Output Power Supplies
for TV TFT LCD Panels
DESCRIPTION
The EUP2683 generates all the four supply rails for
thin-film transistor liquid-crystal display (TFT LCD) TV
panels operating from a regulated 12V input. They include
a step-down and a step-up regulator, a positive and a
negative charge pump.
The step-up and step-down switching regulators feature
internal power MOSFETs and high-frequency operation
allowing the use of small inductors and capacitors,
resulting in a compact solution. The step-up regulator
provides TFT source driver supply voltage, while the
step-down regulator provides the system with logic supply
voltage. Both regulators use fixed-frequency current-mode
control architectures, providing fast load-transient response
and easy compensation. The positive and negative
charge-pump regulators provide TFT gate-driver supply
voltages. Both output voltages can be adjusted with
external resistive voltage-dividers. Both switching
regulators and both charge pumps operate from a central
clock that can be set to either 750 kHz or 500 kHz by tying
the FREQ pin high or low.
The EUP2683 features adjustable power-up sequencing,
step-up regulator over voltage protection, step-down
regulator short-circuit protection, and over temperature
protection to ensure in safe operating. The device also
incorporates a gate drive signal to control an external
MOSFET isolation switch connected in series with V_S or
V_GH.
Typical Application Circuit
FEATURES
8V to 14.7V In Input Voltage Range
Selectable Frequency (500kHz/750kHz)
Current-Mode Step-Up Regulator
- Built-In 20V, 3.7A, 100mΩ MOSFET
Current-Mode Step-Down Regulator
- Built-In 20V, 2.3A, 175mΩ MOSFET
100mA Charge Pump Output Current
Negative Charge Pump Driver for V_GL
Positive Charge Pump Driver for V_GH
Adjustable Sequencing for V_GL and V_GH
Gate Drive Signal to Drive External MOSFET
Internal and Adjustable Soft Start
Short-Circuit Protection
Over voltage Protection
Thermal Shutdown
Available in TSSOP-28 (EP) Package
RoHS Compliant and 100% Lead (Pb)-Free
Halogen-Free
APPLICATIONS
TFT LCD Displays for Monitor and LCD TV
DS2683 Ver1.2 Apr. 2013
Figure 1. Typical Application Circuit
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