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參數(shù)資料
| 型號： | T6313A-BF |
| 廠商： | TM Technology, Inc. |
| 英文描述： | Low Noise, High Efficiency WhiteLED Charge Pump |
| 中文描述： | 低噪聲，高效率電荷泵WhiteLED |
| 文件頁數(shù)： | 6/10頁 |
| 文件大小： | 99K |
| 代理商： | T6313A-BF |
TE
CH
tm
Preliminary T6313A
TM Technology Inc. reserves the right
P. 6
to change products or specifications without notice.
Publication Date: JAN. 2006
Revision:C
Functional Description
The T6313A uses a fractional (x1.5)
conversion charge pump to generate a voltage
for the regulated current sinks. These current
sinks are used to ensure a constant current for
each LED.
The charge pump can generate total 80
mA of output current, so each of the 4 LED
outputs can be powered with up to 20 mA of
current.
The T6313A uses two wires to enable
and set the LED currents. The EN pin is used
to either enabling or disabling the T6313A.
When EN is high, then the numbers of
pulse shift from SET pin are valid and an
internal counter counts up from 1 from the
first rising edge of SET and increases by one
when another rising edge of SET is shifted in.
The outputs of the counter will map to 32
levels of LED current. Each level (code) is
mapped to a different current, which is a
defferent brightness (Fig-2 & Tabel1). Once
the final clock cycle is input for the desired
brightness level, the SET pin is held high to
maintain the device output current at the
programmed level. The device is disabled
350us after the SET pin transitions to a logic
low state. A level will stay until EN goes low.
T6313A is power down when EN goes low.
After EN goes low then any pulse shifting
from SET pin is invalid (Fig-3).
I diode(mA)
25
0
5
10
15
20
1
2
3
4
5
6
7
8
9
1
1
1
1
1
1
1
Fig - 2
1
1
1
2
2
2
2
2
2
2
2
2
2
3
3
3
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