EL5126(2003) View Datasheet(PDF) - Intersil

Part Name

Description

Manufacturer

EL5126
(Rev.:2003)

8-Channel TFT-LCD Reference Voltage Generator

Intersil 

EL5126

The maximum power dissipation actually produced by the IC

is the total quiescent supply current times the total power

supply voltage and plus the power in the IC due to the loads.

PDMAX = VS × IS + Σ[(VS - VOUTi ) × ILOADi]

when sourcing, and:

PDMAX = VS × IS + Σ(VOUTi × ILOADi)

when sinking.

Where:

• i = 1 to total 8

• VS = Supply voltage

• IS = Quiescent current

• VOUTi = Output voltage of the i channel

• ILOADi = Load current of the i channel

By setting the two PDMAX equations equal to each other, we

can solve for the RLOAD's to avoid the device overheat. The

package power dissipation curves provide a convenient way

to see if the device will overheat.

POWER SUPPLY BYPASSING AND PRINTED CIRCUIT

BOARD LAYOUT

Good printed circuit board layout is necessary for optimum

performance. A low impedance and clean analog ground

plane should be used for the EL5126. The traces from the

two ground pins to the ground plane must be very short. The

thermal pad of the EL5126 should be connected to the

analog ground plane. Lead length should be as short as

possible and all power supply pins must be well bypassed. A

0.1µF ceramic capacitor must be place very close to the VS,

VREFH, VREFL, and CAP pins. A 4.7µF local bypass

tantalum capacitor should be placed to the VS, VREFH, and

VREFL pins.

APPLICATION USING THE EL5126

In the first application drawing, the schematic shows the

interconnect of a pair of EL5126 chips connected to give

8 gamma corrected voltages above the VCOM voltage, and

8 gamma corrected voltages below the VCOM voltage.

10

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