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参数资料
| 型号： | TPS60251RTWR |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 稳压器 |
| 英文描述： | SWITCHED CAPACITOR CONVERTER, 750 kHz SWITCHING FREQ-MAX, PQCC24 |
| 封装： | 4 X 4 MM, GREEN, PLASTIC, QFN-24 |
| 文件页数： | 4/26页 |
| 文件大小： | 783K |
| 代理商： | TPS60251RTWR |
www.ti.com
I
LED(mA) +
1.254
R
IS
) 1.276
10*6
Step
500
3.5
10*6
*
1.254
R
IS
) 1.276
10*6
1714.29
106
(1)
I
LED(mA) +
1.254
R
IS
) 1.276
10*6
Step
100
3.5
10*6
(2)
SLVS767C – APRIL 2007 – REVISED NOVEMBER 2007
Where RIS is the resistor from IS to GND, ILED is the LED current in A and Step is the dimming step set by the
I2C interface (1 to 63). ILED may be set up to 25mA (RIS = 562 k).
RIS has an effect on the current steps that are programmed using the I
2C. When the current is programmed
below 1.5mA, the current is determined by the following equation:
This equation provides a greater resolution in current steps at lower currents.
STEP
ILED
STEP
ILED
STEP
ILED
STEP
ILED
1
100
A
17
2.5mA
33
10.5mA
49
18.5mA
2
200
A
18
3.0mA
34
11.0mA
50
19.0mA
3
300
A
19
3.5mA
35
11.5mA
51
19.5mA
4
400
A
20
4.0mA
36
12.0mA
52
20.0mA
5
500
A
21
4.5mA
37
12.5mA
53
20.5mA
6
600
A
22
5.0mA
38
13.0mA
54
21.0mA
7
700
A
23
5.5mA
39
13.5mA
55
21.5mA
8
800
A
24
6.0mA
40
14.0mA
56
22.0mA
9
900
A
25
6.5mA
41
14.5mA
57
22.5mA
10
1.0mA
26
7.0mA
42
15.0mA
58
23.0mA
11
1.1mA
27
7.5mA
43
15.5mA
59
23.5mA
12
1.2mA
28
8.0mA
44
16.0mA
60
24.0mA
13
1.3mA
29
8.5mA
45
16.5mA
61
24.5mA
14
1.4mA
30
9.0mA
46
17.0mA
62
25.0mA
15
1.5mA
31
9.5mA
47
17.5mA
63
25.5mA
16
2.0mA
32
10.0mA
48
18.0mA
Figure 14. Dimming Steps for Sub, Main, and Keypad Backlight
Figure 14 shows the dimming steps for sub, main, and auxiliary display banks in the 25mA maximum current
application. To satisfy today’s requirements on LED current, the TPS60251 covers low LED current area from
100
A to 1.5mA with 100-A dimming step (total 16 steps for 25-mA maximum current) for the new LCD panels
which have improved transparency rates. For LED currents in the range from 2mA to 25mA, the device uses 48
dimming steps with 0.5mA step. Also, DM5 has 4 dimming steps once the current path is assigned for auxiliary
applications with maximum 80-mA current.
12
Copyright 2007, Texas Instruments Incorporated
Product Folder Link(s): TPS60251
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