a705ngt-350 ADD Microtech Inc., a705ngt-350 Datasheet - Page 4

• Manufacturer Part Number: a705ngt-350
• Description: High Power Advanced Current Regulator
• Manufacturer: ADD Microtech Inc.

Output Capacitor C
A705 is located in the same PCB, and the length of the routing path L1<10cm & L2<3cm, the output capacitor C
be neglected. The number of LEDs in series could be 1 ~ 3, that the total V
capacitor C
much longer than 3cm.
be separated because the voltage level of V
application circuit is shown in the following figure.
Copyright © 2009 ADDtek Corp.
The output capacitor C
If LED and A705 is located in separate PCBs, or the length of the routing path L1>10cm or L2>3cm, the output
If four LEDs or more are connected in series to OUT pin, the supply voltage to VDD pin and LED+ end should
GND
V
O
IN
should be added. Typically, capacitance of 0.1uF ~ 1uF is recommended and 1uF is needed when L2 is
C
1uF
PCB
IN
O
A705
and PCB layout:
O
Length = L1
VDD
GND
may be removed under certain condition. Please refer to the following figure. If LED and
OUT
GND
GND
V
IN
V
APPLICATION INFORMATION
IN
C
1uF
LED+
IN
C
1uF
0.1uF
C
1uF
IN
O
|
C
1uF
is higher than the voltage rating of VDD pin. The recommended
BP
Length
= L2
PCB
VDD
A705
4
A705
Length = L1
GND
VDD
GND
OUT
GND
OUT
V
IN
Length = L2
C
1uF
PCB
IN
F
C
0.1uF
of the LED string is smaller 11V.
1uF
O
|
V
＋
－
F, Total
PCB
A705
Length = L1
VDD
GND
OUT
DD077_D -- JULY 2009
C
0.1uF
Length
= L2
1uF
O
|
A705
O
can