tb62707fg Marktech Optoelectronics, tb62707fg Datasheet - Page 10

• Manufacturer Part Number: tb62707fg
• Description: 8bit Pipo Pallalel In , Pallalel Out Constant Current Drivers
• Manufacturer: Marktech Optoelectronics

LED DRIVER TB6270X SERIES APPLICATION NOTE
Moreover, IC operation may become unstable by long wiring. It recommends arranging IC and LED to near.
APPLICATION
[3] Pattern layout
IO(max.) * Nu mber of CH s(max .)
VLED
supply voltage (V
This device owns only one ground pin that means signal ground pin and power ground pin are common.
If ground pattern layout contains large inductance and impedance and the voltage between ground and
would life you to pay attention to pattern layout to minimize inductance.
LATCH , CLOCK terminals exceeds 2.5V by switching noise in operation, this device may miss−operate. So we
VF of LED
O
). Moreover, Resistor R is calculable by the lower formula.
VO (min .)
[1] Output current (I OUT )
Fig.1.
[2] Total supply voltage (VLED)
When a higher voltage is input to the divide, the excess
voltage is consumed inside the device, that leads to power
dissipation.
In order to minimize power dissipation and loss, we would like
to recommended to set the total supply voltage as shown
below.
dissipation of this divide, an additional R can decrease the
10
I
This device can operate 0.4~0.7V (V
V
When the total supply is too high considering the power
OUT
LED
= V
is set by the external resistor (R−EXT) as shown in
(Total supply voltage)
CE
(Tr V
sat
) + V
f
(LED Forward voltage) + V
O
).
TB62707FG
2006-06-14
O