EL5226 INTERSIL [Intersil Corporation], EL5226 Datasheet - Page 11

• Manufacturer Part Number: EL5226
• Description: 10- and 12-Channel TFT-LCD Reference Voltage Generators
• Manufacturer: INTERSIL [Intersil Corporation]

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.
when sourcing, and:
when sinking.
Where:
• i = 1 to total 12
• V
• I
• V
• I
By setting the two P
can solve for the R
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 EL5226 and EL5326. The
traces from the two ground pins to the ground plane must be
very short. The thermal pad of the EL5226 and EL5326
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 V
pins. A 4.7µF local bypass tantalum capacitor should be
placed to the V
APPLICATION USING THE EL5226 AND EL5326
In the first application drawing, the schematic shows the
interconnect of a pair of EL5226 and EL5326 chips
connected to give 8 gamma corrected voltages above the
V
V
P
P
COM
COM
DMAX
DMAX
S
LOAD
S
OUT
= Quiescent current
= Supply voltage
voltage, and 8 gamma corrected voltages below the
voltage.
i = Output voltage of the i channel
=
i = Load current of the i channel
=
V
V
S
S
×
×
S
I
I
S
S
, V
+
+
LOAD
REFH
Σ V
Σ V
DMAX
(
[
(
OUT
S
's to avoid the device overheat. The
, and V
- V
equations equal to each other, we
i
S
×
OUT
11
, V
I
LOAD
REFH
REFL
i )
×
i
)
I
LOAD
, V
pins.
REFL
i
]
, and CAP
EL5226, EL5326