TB62707FG 데이터 시트보기 (PDF) - Toshiba
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TB62707FG Datasheet PDF : 15 Pages
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TB62707FG
LED DRIVER TB6270X SERIES APPLICATION NOTE
[1] Output current (IOUT)
IOUT 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 (VO).
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.
VLED (Total supply voltage)
= VCE (Tr Vsat) + Vf (LED Forward voltage) + VO
When the total supply is too high considering the power
dissipation of this divide, an additional R can decrease the
supply voltage (VO). Moreover, Resistor R is calculable by the lower formula.
VLED VF of LED VO (min .)
IO(max.) * Number of CH s(max.)
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.
10
2006-06-14
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