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参数资料
| 型号： | SP6682ER-L/TR |
| 厂商： | Exar Corporation |
| 文件页数： | 8/13页 |
| 文件大小： | 0K |
| 描述： | IC LED DRIVER WHITE 10DFN |
| 标准包装： | 3,000 |
| 拓扑： | PWM，升压（升压），切换式电容器（充电泵） |
| 输出数： | 1 |
| 内部驱动器： | 是 |
| 类型 - 主要： | 背光，闪灯/白光 |
| 类型 - 次要： | 白色 LED |
| 频率： | 420kHz ~ 780kHz |
| 电源电压： | 2.7 V ~ 5.5 V |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 10-VFDFN 裸露焊盘 |
| 供应商设备封装： | 10-DFN（3x3） |
| 包装： | 带卷 (TR) |
| 工作温度： | -40°C ~ 85°C |
S P 6 6 8 2
H i g h E f f i c i e n c y W h i t e L E D C h a r g e P u m p R e g u l a t o r
V TH = 1 . 25 × ? 1 +
?
use this feature, divider resistors should be
chosen according to the specific applica-tion,
as shown in Figure 16.
?
?
R 1 ?
R 2 ?
R 1 = ? TH ? 1 ? × R 2
which can be expressed as R1:
? V ?
? 1 . 25 ?
For the typical SP6682 application, using
V F =3.6V, M=4, I LED =15mA, R OUT =16 ? , the V TH
will be 3.24V. Select R2=100k ? , then
R1=158k ? .
C APACITOR S ELECTION
( V F + 0 . 306 + M × I LED × R OUT )
V TH =
Fig. 16: Programming the V MODE Resistors
The guideline for divider resistor selections is
as follows: For high input voltage, the SP6682
will work in X1.5 mode. When the input
voltage drops to the V TH threshold voltage, it
will switch to X2 mode automati-cally. The V TH
threshold voltage for mode change can be
calculated by:
1 . 5
Where V F and M are the forward voltage and
number of the white LEDs, R OUT is the output
resistance of the SP6682. The equation for the
voltage divider R1 and R2 with V MODE = 1.25V
is:
Ceramic capacitors are recommended for their
inherently low ESR, which will help produce
low peak to peak output ripple, and reduce
high frequency spikes.
The fly capacitor controls the strength of the
charge pump. Selection of the fly capacitor is
a trade-off between the output voltage ripple
and the output current capability. Decreasing
the fly capacitor will reduce the output voltage
ripple because less charge will be delivered to
the output capacitor. However, smaller fly
capacitors lead to larger output resistance,
thus decreasing the out-put current capability
and the circuit effi-ciency. Place all the
capacitors as close to the SP6682 as possible
for layout. Increasing the value of the input
and output capaci-tors could further reduce
the input and out-put ripple.
Refer to Table 1 for some suggested low ESR
capacitors.
Manufacturer
TDK
TDK
Murata
Murata
Part Number
C2012X5R1A225K
C2012X5R0J475K
GRM188R60J225KE01D
GRM219R60J475KE01D
Capacitance
Voltage
2.2μF/10V
4.7μF/6.3V
2.2μF/6.3V
4.7μF/6.3V
Capacitor
Size/Type
0805/X5R
0805/X5R
0805/X5R
0805/X5R
ESR @ 100KHz
0.030 ?
0.020 ?
0.030 ?
0.020 ?
Table 1: Suggested Low ESR Capacitors
B RIGHTNESS C ONTROL U SING PWM
Dimming control can be achieved by applying
a PWM control signal to the EN/PWM pin. The
brightness of the white LEDs is con-trolled by
increasing and decreasing the duty cycle of
the PWM signal. While the operating frequency
range of the PWM control is from 60Hz to
700Hz, the recommended maxim-um
brightness frequency range of the PWM signal
is from 60Hz to 200Hz. A repetition rate of at
least 60Hz is required to prevent flicker.
? 2009 Exar Corporation
8/13
Rev. 2.0.0
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相关代理商/技术参数 |
参数描述 |
|---|---|
| SP6682EU | 制造商:Exar Corporation 功能描述:Driver, Other |
| SP6682EU/TR | 制造商:SIPEX 制造商全称:Sipex Corporation 功能描述:High Efficiency Charge Pump Regulator for White LEDs |
| SP6682EU-L | 功能描述:电荷泵 2.5V-16V 600kHz temp -40C to 85C RoHS:否 制造商:Maxim Integrated 功能:Inverting, Step Up 输出电压:- 1.5 V to - 5.5 V, 3 V to 11 V 输出电流:100 mA 电源电流:1 mA 最大工作温度:+ 70 C 封装 / 箱体:SOIC-8 Narrow 封装:Tube |
| SP6682EU-L/TR | 功能描述:电荷泵 High Efficiency for White LEDs RoHS:否 制造商:Maxim Integrated 功能:Inverting, Step Up 输出电压:- 1.5 V to - 5.5 V, 3 V to 11 V 输出电流:100 mA 电源电流:1 mA 最大工作温度:+ 70 C 封装 / 箱体:SOIC-8 Narrow 封装:Tube |
| SP6682UEB | 功能描述:电源管理IC开发工具 Eval Board for SP6682U Series RoHS:否 制造商:Maxim Integrated 产品:Evaluation Kits 类型:Battery Management 工具用于评估:MAX17710GB 输入电压: 输出电压:1.8 V |
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