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參數(shù)資料
| 型號： | TB62707FG |
| 廠商： | Toshiba Corporation |
| 英文描述： | 8BIT PIPO (Pallalel In , Pallalel Out) CONSTANT CURRENT DRIVERS |
| 中文描述： | 8位皮普（Pallalel在，Pallalel出）恒流驅(qū)動器 |
| 文件頁數(shù)： | 10/15頁 |
| 文件大小： | 346K |
| 代理商： | TB62707FG |
TB62707FG
2006-06-14
10
LED DRIVER TB6270X SERIES APPLICATION NOTE
[1] Output current (IOUT)
I
OUT
is set by the external resistor (R
EXT) as shown in
Fig.1.
[2] Total supply voltage (VLED)
This device can operate 0.4~0.7V (V
O
).
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.
V
LED
(Total supply voltage)
= V
CE
(Tr V
sat
) + V
f
(LED Forward voltage) + V
O
When the total supply is too high considering the power
dissipation of this divide, an additional R can decrease the
supply voltage (V
O
). Moreover, Resistor R is calculable by the lower formula.
Moreover, IC operation may become unstable by long wiring. It recommends arranging IC and LED to near.
APPLICATION
[3] Pattern layout
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
LATCH , CLOCK terminals exceeds 2.5V by switching noise in operation, this device may miss
operate. So we
would life you to pay attention to pattern layout to minimize inductance.
VLED VF of LED VO(min.)
IO(max.) * Number of CHs(max.)
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