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參數(shù)資料
| 型號： | TPS60251RTW |
| 廠商： | Texas Instruments, Inc. |
| 英文描述： | HIGH EFFICIENCY CHARGE PUMP FOR 7 WLEDs WITH I2C INTERFACE |
| 中文描述： | 高效電荷泵7，帶有I2C接口個WLED |
| 文件頁數(shù)： | 13/28頁 |
| 文件大小： | 515K |
| 代理商： | TPS60251RTW |
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SETTING THE LED CURRENT
The maximum LED current is user programmable using the IS input. Connect a resistor from IS to GND to set
the maximum LED current. The resistor value is calculated using the following equation between 2mA and
25.5mA:
I
LED
( A)
1.254
R
IS
1.276
10
6
Step
3.5
500
10
6
1.254
R
IS
1.276
10
6
1714.29
10
6
(1)
I
LED
( A)
1.254
R
IS
1.276
10
6
Step
3.5
100
10
6
(2)
TPS60251
SLVS767–APRIL 2007
APPLICATION INFORMATION (continued)
Where R
IS
is the resistor from IS to GND, I
LED
is the LED current in
μ
A and Step is the dimming step set by the
I
2
C interface (1 to 63). I
LED
may be set up to 25mA (R
IS
= 562 k
).
R
has an effect on the current steps that are programmed using the I
2
C. 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
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
ILED
100
μ
A
200
μ
A
300
μ
A
400
μ
A
500
μ
A
600
μ
A
700
μ
A
800
μ
A
900
μ
A
1.0mA
1.1mA
1.2mA
1.3mA
1.4mA
1.5mA
2.0mA
STEP
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
ILED
2.5mA
3.0mA
3.5mA
4.0mA
4.5mA
5.0mA
5.5mA
6.0mA
6.5mA
7.0mA
7.5mA
8.0mA
8.5mA
9.0mA
9.5mA
10.0mA
STEP
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
ILED
10.5mA
11.0mA
11.5mA
12.0mA
12.5mA
13.0mA
13.5mA
14.0mA
14.5mA
15.0mA
15.5mA
16.0mA
16.5mA
17.0mA
17.5mA
18.0mA
STEP
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
ILED
18.5mA
19.0mA
19.5mA
20.0mA
20.5mA
21.0mA
21.5mA
22.0mA
22.5mA
23.0mA
23.5mA
24.0mA
24.5mA
25.0mA
25.5mA
Figure 14. Dimming Steps for Sub, Main, and Keypad Backlight
13
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| TPS60251RTWR | 功能描述:LED照明驅(qū)動器 High Eff Charge Pump RoHS:否 制造商:STMicroelectronics 輸入電壓:11.5 V to 23 V 工作頻率: 最大電源電流:1.7 mA 輸出電流: 最大工作溫度: 安裝風格:SMD/SMT 封裝 / 箱體:SO-16N |
| TPS60251RTWRG4 | 功能描述:LED照明驅(qū)動器 High Eff Charge Pump RoHS:否 制造商:STMicroelectronics 輸入電壓:11.5 V to 23 V 工作頻率: 最大電源電流:1.7 mA 輸出電流: 最大工作溫度: 安裝風格:SMD/SMT 封裝 / 箱體:SO-16N |
| TPS60251RTWT | 功能描述:LED照明驅(qū)動器 High Eff Charge Pump RoHS:否 制造商:STMicroelectronics 輸入電壓:11.5 V to 23 V 工作頻率: 最大電源電流:1.7 mA 輸出電流: 最大工作溫度: 安裝風格:SMD/SMT 封裝 / 箱體:SO-16N |
| TPS60251RTWT | 制造商:Texas Instruments 功能描述:DC/DC Charge Pump Converter IC |
| TPS60251RTWTG4 | 功能描述:LED照明驅(qū)動器 High Eff Charge Pump RoHS:否 制造商:STMicroelectronics 輸入電壓:11.5 V to 23 V 工作頻率: 最大電源電流:1.7 mA 輸出電流: 最大工作溫度: 安裝風格:SMD/SMT 封裝 / 箱體:SO-16N |
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