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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
different applications, as shown in figures 12-
14.
Figure 12 shows a circuit using the SP6682 to
drive discrete white LEDs as a current source.
Fig. 14: Driving 2-Wire White LED Module
as Current Source
In this application, the bias resistor can be
selected by:
Fig. 12: Driving Discrete White LEDs as Current Source
The current in one white LED current is set by
R B =
V FB
I LED ( TOTAL )
R B =
the ratio of the feedback pin voltage (306mV)
and the bias resistor RB. To set the operating
current, RB can be selected by:
V FB
I LED
The current of the remaining white LEDs is set
Where I LED(TOTAL) is the total operating current
of all the white LEDs.
To use the SP6682 as a voltage source for
fixed voltage applications, a voltage divider is
needed to program the ouput voltage, as
shown in Figure 15.
according to the similarity of the white LEDs.
A 3-wire white LED module with internal series
resistors as shown in figure 13 can also be
driven in this way.
Fig. 15: Driving 2-Wire White LED Module
as Voltage Source
The output voltage is set by the ratio of the
two resistors and the feedback control voltage
as shown by:
V OUT = ? ? 1 + 5 ? ? × V FB
Fig. 13: 3-Wire White LED Module
In Figure 14, the SP6682 was used to drive a
2-wire white LED module without internal
series resistors as a current source. The bias
resistor RB is selected to regulate the total
current of the white LED module in-stead of
the current of single LED as in Figure 12.
? R ?
? R 6 ?
P ROGRAMMING T HE O PERATING M ODE
SP6682 can automatically change from X1.5
mode to X2 mode for highest efficiency. To
? 2009 Exar Corporation
7/13
Rev. 2.0.0
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相关代理商/技术参数
SP6682ER 制造商:Exar Corporation 功能描述:Driver, Other
SP6682ER/TR 制造商:SIPEX 制造商全称:Sipex Corporation 功能描述:High Efficiency Charge Pump Regulator for White LEDs
SP6682ER-L 功能描述:电荷泵 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
SP6682ER-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
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