DD331 Datasheet, PDF (8/11 Pages) Silicon Touch Technology Inc. – 4-Channel Flexible LED Pre-Driver

點晶科技股份有限公司
SILICON TOUCH TECHNOLOGY INC.
Typical Application
DD331
DD331
Application Notice
Notice the Rext applies to lower than 5 Ω, the wire resistance(Rwire) will affect Iout a
lot. For example, when Rext=5Ω Iout= 104mA, if Rwire=1Ω, than Iout will decrease
1.96%. Due to large current flow through rext, it needs high power resistor to apply to
prevent element burn out issue.
Dissipation Ratings
PACKAGE
POWER DISSAPATION
( Tj_max=150 ^oC )
SOP16
1.7 W
SSOP16
1.5 W
THERMAL RESISTANCE
( Rth_{(junction-to-air)}, Ta=25^oC )
72.1 ^oC/W
82 ^oC/W
Power Dissipation
Notice that the power dissipation of a semiconductor chip is limited to its package and
ambient temperature, in which the device requires the maximum output current calculated
for given operating conditions. The maximum allowable power consumption can be
calculated by the following equation:
Pd(max)(Watt) = ^{Tj(junction temperature)(max)(° C) - Ta(ambient temperature)(° C)}
Rth(junction- to- air thermal resistance)(° C/Watt)
High CONSTANT CURRENT LED DRIVERS
Version:A.002
Page 7