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參數(shù)資料
| 型號： | LQH2MCN150K02 |
| 廠商： | Linear Technology Corporation |
| 英文描述： | 20mA LED Driver and OLED Driver with Integrated Schottky in 3mm x 2mm DFN |
| 中文描述： | 20mA的LED驅(qū)動器和3毫米的OLED驅(qū)動器集成肖特基x 2mm DFN封裝 |
| 文件頁數(shù)： | 10/24頁 |
| 文件大?。?/td> | 449K |
| 代理商： | LQH2MCN150K02 |
LT3498
10
3498f
APPLICATIONS INFORMATION—LED DRIVER
Figure 3. Transient Response with
LEDs Disconnected From Output
Table 2: Recommended Ceramic Capacitor Manufacturers
Taiyo Yuden
(800) 368-2496
www.t-yuden.com
AVX
(803) 448-9411
www.avxcorp.com
Murata
(714) 852-2001
www.murata.com
Overvoltage Protection
The LED driver of the LT3498 has an internal open-circuit
protection circuit. In the cases of output open circuit, when
the LEDs are disconnected from the circuit or the LEDs
fail open-circuit, V
CAP1
is clamped at 27V (typ). The LED
driver will then switch at a very low frequency to minimize
input current. The V
CAP1
and input current during output
open-circuit are shown in the Typical Performance Char-
acteristics. Figure 3 shows the transient response when
the LEDs are disconnected.
Inrush Current
The LT3498 LED Driver has a built-in Schottky diode.
When supply voltage is applied to the V
IN
pin, an inrush
current flows through the inductor and Schottky diode
and charges up the CAP1 voltage. The Schottky diode
for the LED Driver of the LT3498 can sustain a maximum
current of 1A.
For low DCR inductors, which are usually the case for this
application, the peak inrush current can be simplified as
follows:
r
L
2
where L is the inductance, r is the DCR of the inductor
and C is the output capacitance.
Table 3 gives inrush peak currents for some component
selections.
Table 3: Inrush Peak Currents
α
ω
ω
α
ω
π
=
=
=
L C
r
L
I
V
L
PK
IN
1
4
2
2
–
–0 6
exp –
2
V
IN
(V)
4.2
4.2
4.2
4.2
r (
Ω
)
0.58
1.6
0.8
0.739
L (μH)
C
OUT
(μF)
1
1
1
1
I
P
(A)
0.828
0.682
0.794
0.803
15
15
15
15
500
μ
s
/DIV
I
L
200mA/DIV
V
CAP1
10V/DIV
349
8
F03
V
= 3.6V
FRONT PAGE APPLICATION CIRCUIT
LED
s
DI
S
CONNECTED
AT THI
S
POINT
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LQH2MCN150K02L | 功能描述:固定電感器 Choke Circuit Coated 15uH RoHS:否 制造商:AVX 電感:10 uH 容差:20 % 最大直流電流:1 A 最大直流電阻:0.075 Ohms 工作溫度范圍:- 40 C to + 85 C 自諧振頻率:38 MHz Q 最小值:40 尺寸:4.45 mm W x 6.6 mm L x 2.92 mm H 屏蔽:Shielded 端接類型:SMD/SMT 封裝 / 箱體:6.6 mm x 4.45 mm |
| LQH2MCN150K02p | 制造商:MURATA 制造商全稱:Murata Manufacturing Co., Ltd. 功能描述:Chip Inductor (Chip Coil) Power Inductor (Wire Wound Type) LQH2MC_02 Series (0806 Size) |
| LQH2MCN150M52 | 制造商:MURATA 制造商全稱:Murata Manufacturing Co., Ltd. 功能描述:DESIGN ENGINEERING KITS |
| LQH2MCN150M52L | 功能描述:固定電感器 0806 15uH 20% RoHS:否 制造商:AVX 電感:10 uH 容差:20 % 最大直流電流:1 A 最大直流電阻:0.075 Ohms 工作溫度范圍:- 40 C to + 85 C 自諧振頻率:38 MHz Q 最小值:40 尺寸:4.45 mm W x 6.6 mm L x 2.92 mm H 屏蔽:Shielded 端接類型:SMD/SMT 封裝 / 箱體:6.6 mm x 4.45 mm |
| LQH2MCN180K02 | 制造商:MURATA 制造商全稱:Murata Manufacturing Co., Ltd. 功能描述:Chip Inductor (Chip Coil) Power Inductor (Wire Wound Type) LQH2MC_02 Series (0806 Size) |
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