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參數(shù)資料
| 型號(hào)： | LM2791 |
| 廠商： | National Semiconductor Corporation |
| 元件分類： | LED驅(qū)動(dòng)器 |
| 英文描述： | Current Regulated Switched Capacitor LED Driver with Analog Brightness Control |
| 中文描述： | 電流調(diào)節(jié)開(kāi)關(guān)電容LED與模擬亮度控制驅(qū)動(dòng)器 |
| 文件頁(yè)數(shù)： | 4/11頁(yè) |
| 文件大?。?/td> | 226K |
| 代理商： | LM2791 |
Absolute Maximum Ratings
If Military/Aerospace specified devices are required,
please contact the National Semiconductor Sales Office/
Distributors for availability and specifications.
(Note 1)
V
IN
BRGT, SD
Power Dissipation(Note 2)
T
JMAX
(Note 2)
θ
JA
(Note 7)
Storge Temperature
Lead Temp. (Soldering, 5 sec.)
0.3 to 6V
-0.3 to (V
IN
+0.2V)
400 mW
150C
55C/W
65C to +100C
260C
ESD Rating
Human Body Model
Machine Model
2KV
200V
Operating Conditions
Input Voltage (V
IN
)
BRGT
Ambient Temperature (T
A
)
Junction Temperature (T
J
)
3.0V to 5.8V
0 to 3.0V
30C to +85C
30C to +100C
Electrical Characteristics
Limits in standard typeface are for T
J
= 25C and limits in
boldface type
apply over the full
Operating Temperature Range
.
Unless otherwise specified, C
1
= C
IN
= C
HOLD
= 1 μF, V
IN
= 3.6V, V
DIODE
= 3.6V, R
SET
= 332
, BRGT pin = 0V.
Symbol
Parameter
Conditions
I
DX
Diode Current at ID1,2
V
IN
= 3V, R
SET
= 270
Available Current at Output Dx
V
IN
= 3V
V
IN
= 3.3V
V
IN
= 3.6V
V
IN
= 4.4V
I
Dx
Load Regulation at Output Dx
V
IN
=3.6V
V
DX
=3.0V
V
DX
=4.0V
I
DX
Line Regulation of Dx Output
Current
V
DX
= 3.6V
I
D-MATCH
Current Matching Between Any
Two Outputs
V
D1
, V
D2
= 3.6V
I
Q
Quiescent Supply Current
3.0V
≤
V
IN
≤
4.4V, Active, No
Load Current
I
SD
Shutdown Supply Current
3.0V
≤
V
IN
≤
5.5V, Shutdown at
85C
V
IH
SD Input Logic High
3.0V
≤
V
IN
≤
5.5V, (Note 5)
V
IL
SD Input Logic Low
3.0V
≤
V
IN
≤
5.5V, (Note 5)
I
LEAK-SD
SD Input Leakage Current
0V
≤
V
SD
≤
V
IN
R
BRGT
BRGT Input Resistance
I
SET
I
SET
Pin Output Current
f
SW
Switching Frequency (Note 4)
3.0V
≤
V
IN
≤
4.4V
t
START
Startup Time(Note 6)
I
Dx
= 90% steady state
Min
16.5
Typ
18
14.5
15.1
15.7
16.8
Max
Units
mA
12.8
13.3
17.7
18.4
16
15.4
mA
3.3V
≤
V
IN
≤
4.4V
15.7
mA
3.0V
≤
V
IN
≤
4.4V
0.3
%
0.7
2
mA
0.1
0.3
1
μA
0.8V
IN
V
V
μA
k
mA
kHz
μs
0.2V
IN
0.1
250
I
Dx
/25
650
10
450
850
Note 1:
Absolute maximum ratings indicate limits beyond which damage to the device may occur. Electrical specifications do not apply when operating the device
beyond its rated operating conditions.
Note 2:
D1 and D2 may be shorted to GND without damage. P
OUT
may be shorted to GND for 1sec without damage.
Note 3:
In the test circuit, all capacitors are 1.0μF, 0.3
maximum ESR capacitors. Capacitors with higher ESR will increase output resistance, reduce output
voltage and efficiency.
Note 4:
The output switches operate at one half of the oscillator frequency, f
OSC
= 2f
SW
.
Note 5:
The interanl thresholds of the shutdown bar are set at about 40% of V
IN
.
Note 6:
This electrical specification is guaranteed by design.
Note 7:
For more inforamtion regarding the LLP package, please refer to National Semiconductor Application note AN1187
L
www.national.com
4
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| LM2791B WAF | 制造商:Texas Instruments 功能描述: |
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| LM2791LD-L/NOPB | 功能描述:LED照明驅(qū)動(dòng)器 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(fēng)格:SMD/SMT 封裝 / 箱體:SO-16N |
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