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参数资料
| 型号： | SP6685EB |
| 厂商： | Exar Corporation |
| 文件页数： | 12/14页 |
| 文件大小： | 0K |
| 描述： | EVAL BOARD FOR SP6685 |
| 标准包装： | 1 |
| 系列： | * |
S P 6 6 8 5
7 0 0 m A B u c k / B o o s t C h a r g e P u m p L E D D r i v e r
R ESISTOR S ELECTION
The sense resistor R SENSE is determined by the
value needed in the Torch mode for the
range of typical resistor values and sizes are
shown in table 2.
desired output current by the equation:
R SENSE = V FB /I OUT
Where V FB = 50mV (Torch Mode)
Once the R SENSE resistor has been selected for
Torch mode, the V FB voltage can be selected
for Flash mode using the following equation:
V FB = I OUT * R SENSE (Flash Mode)
Where I OUT is for Flash Mode.
Next, the R SET resistor can be selected for
Flash mode using the following equation:
Part Ref.
R SET
R SET
R SET
R SET
R SET
R SET
R SET
R SET
R SET
R SET
R SENSE
R SENSE
R SENSE
R SENSE
R SENSE
Value
68K ?
75K ?
82K ?
91K ?
100K ?
110K ?
120K ?
130K ?
140K ?
150K ?
0.22 ?
0.27 ?
0.33 ?
0.39 ?
0.47 ?
Tolerance
5%
5%
5%
5%
5%
5%
5%
5%
5%
5%
5%
5%
5%
5%
5%
Size
0402
0402
0402
0402
0402
0402
0402
0402
0402
0402
0603
0603
0603
0603
0603
R SET = (1.26V/ V FB )*11.2K Ω (Flash Mode)
For an example of 200mA Torch mode and
600mA Flash mode, the values R SENSE =
0.25 Ω , VFB = 150mV (Flash Mode), and R SET
= 94K Ω are calculated. The power obtained in
the Flash mode would be:
P FLASH = V FB *I OUT = 150mV*600mA = 90mW.
The typical 0603 surface mount resistor is
rated 1/10 Watt continuous power and 1/5
Watt pulsed power, more than enough for this
application. For other applications, the P FLASH
power can be calculated and resistor size
selected. The R SENSE resistor is recommended
to be size 0603 for most applications. The
Table 2: Resistor Value and Sizes
E VALUATION BOARD CIRCUIT LAYOUT
? 2009 Exar Corporation
12/14
Rev. 2.0.0
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相关代理商/技术参数 |
参数描述 |
|---|---|
| SP6685ER | 制造商:Exar Corporation 功能描述:LASER DIODE/LED DRIVER, 10 Pin, Plastic, LCC |
| SP6685ER/TR | 制造商:SIPEX 制造商全称:Sipex Corporation 功能描述:700mA Buck/Boost Charge Pump LED Driver |
| SP6685ER-L | 功能描述:电荷泵 Camera Flash 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 |
| SP6685ER-L/TR | 功能描述:电荷泵 700mA For Camera Flash 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 |
| SP6685ERTR | 制造商:SIPEX 制造商全称:Sipex Corporation 功能描述:Charge Pump LED Driver For Camera Flash |
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