ISL59920IRZ Intersil, ISL59920IRZ Datasheet - Page 15

• Manufacturer Part Number: ISL59920IRZ
• Description: IC ANLG VID LINE TRPL 20-QFN
• Manufacturer: Intersil
• Type: Video Delay Liner

Specifications of ISL59920IRZ

• Applications: RGB Video Signals
• Mounting Type: Surface Mount
• Package / Case: 20-VQFN Exposed Pad, 20-HVQFN, 20-SQFN, 20-DHVQFN
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Power Dissipation
As the delay setting increases, additional filter blocks turn on
and insert into the signal path. When the delay per channel
increments, V
does not change significantly. Under the extreme settings,
the positive supply current reaches 141mA and the negative
supply current can be 41mA. Operating at ±5V power supply,
the worst-case ISL5992x power dissipation is:
The minimum θ
the ISL5992x is calculated using Equation 2:
Where:
T
T
For a 20 Ld package on a well laid-out PCB with good
connectivity between the QFN’s pad and the PCB copper
area, 31°C/W θ
yields a much higher power dissipation of 3.54W using
Equation 2 (see Figure 31). To disperse the heat, the bottom
heat spreader must be soldered to the PCB. Heat flows
through the heat spreader to the circuit board copper then
spreads and convects to air. Thus, the PCB copper plane
becomes the heatsink (see TB389). This has proven to be a
very effective technique. A separate application note, which
details the 20 Ld QFN PCB design considerations, is
available.
θ
PD
A
JA
J
is the maximum junction temperature (+135°C)
is the maximum ambient temperature (+85°C)
=
=
5 141mA
(
T
•
J
–
T
A
SP
) PD
JA
JA
⁄
+
current increases by 0.9mA while V
5 41mA
required for long term reliable operation of
thermal resistance can be achieved. This
•
=
55°
C W
⁄
=
15
910mW
ISL59920, ISL59921, ISL59922, ISL59923
SM
(EQ. 1)
(EQ. 2)
August 31, 2010
FN6826.2