ADT6610 ADtech, ADT6610 Datasheet - Page 16

• Manufacturer Part Number: ADT6610
• Description: 3-CH Constant current LED sink driver
• Manufacturer: ADtech

www.DataSheet.co.kr
Aug. 25. 2011
LOAD SUPPLY VOLTAGE( VLED )
The design of VLED should fulfill two targets
1. Less Power consumption and heat.
2. Sufficiently headroom for the LED and driver IC to operate in the constant current region.
The power dissipation in the driver is calculated by the equation.
PD = VDSA x IOUTA + VDSB x IOUTB + VDSC x IOUTC + VCC x ICC
By the spec, the max VCC = 18V, max ICC = 8mA => 144mW.
If VDSA = VDSB = VDSC = 1V, IOUTA=IOUTB=IOUTC=20mA.
PD is about 204mW.
If VDSA,VDSB,VDSC are over 1v then the power dissipation is more than 204mW.
This means, If VDSA,VDSB,VDSC drops too much voltage on the driver, it is necessary
to set external resistors( RA,RB,RC) to reduce the by V
* This specifications are subject to be changed without notice
V
Vf
R
R
VLED
A
•
IOUTA
VDSA
16/21
ADT6610
R
R
B
.
•
IOUTB
VDSB
R
C
VDSC
IOUTC
http://www.ad-tech.co.kr
ADT6610
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