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参数资料
| 型号： | SP6699EB |
| 厂商： | Exar Corporation |
| 文件页数： | 9/12页 |
| 文件大小： | 0K |
| 描述： | EVAL BOARD FOR SP6699 |
| 标准包装： | 1 |
| 系列： | * |
S P 6 6 9 9
2 7 V S t e p U p W h i t e L E D D r i v e r
PWM signal when it is applied on the CTRL pin.
The typical frequency of this PWM signal is
200Hz to 1KHz. Please refer to figure 21.
between the FB Pin and the DC voltage can
get appropriate luminous intensity. Comparing
with all kinds of PWM signal control, this
method features a stable output voltage and
LEDs current. Please refer to figure 24.
Fig. 21: Dimming Control using a PWM Signal
on CTRL Pin
Secondly, adding a constant DC voltage
through a resistor divider to CTRL pin can
control the dimming. The FB voltage is
indirectly adjusted when the CTRL pin voltage
is between 50mV to 1.8V, which can be used
as dimming control. Please refer to figure 22.
Fig. 22: Dimming COntrol using a DC Voltage
on CTRL Pin
Thirdly, using a filtered PWM signal added to
the CTRL pin can achieve dimming control.
The filtered PWM signal can be considered as
an adjustable DC voltage. It will change the FB
voltage indirectly and achieve dimming
control. The circuit is shown in Figure 23.
Fig. 24: Dimming Control using a DC Voltage
Second, using a filtered PWM signal can do it.
The filtered PWM signal can be considered as a
varying and adjustable DC voltage.
Fig. 25: Dimming Control using a Filtered PWM Voltage
Third, using a logic signal to change the
feedback voltage. For example, the FB pin is
connected to the GND through a MOSFET and
a resistor. And this MOSFET is controlled by a
logic signal. The luminous intensity of LEDs
will be changed when the MOSFET turns on or
off.
Fig. 23: Dimming Copntrol using a Filtered PWM Signal
on CTRL Pin
Changing the effective feedback voltage
There are three methods to change the
effective feedback voltage.
First, adding a constant DC voltage through a
resistor divider to FB pin can control the
dimming. Changing the DC voltage or resistor
Fig. 26: Dimming Control using Logic Signal
? 2011 Exar Corporation
9/12
Rev. 2.1.0
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相关代理商/技术参数 |
参数描述 |
|---|---|
| SP6699EK-L | 制造商:Exar Corporation 功能描述:IC CONVERTER STEP UP WHITE LED |
| SP6699EK-L/TR | 功能描述:DC/DC 开关控制器 SET UP WHITE LED CONVERTER RoHS:否 制造商:Texas Instruments 输入电压:6 V to 100 V 开关频率: 输出电压:1.215 V to 80 V 输出电流:3.5 A 输出端数量:1 最大工作温度:+ 125 C 安装风格: 封装 / 箱体:CPAK |
| SP-66A | 制造商:SUPERWORLD 制造商全称:Superworld Electronics 功能描述:Power Transformers - Bracket UL Type |
| SP-66-B | 制造商:Triad Magnetics 功能描述:SP-66 Series 300 Hz to 100 kHz Triad High Reliability Audio Transformer |
| SP-66E | 制造商:SUPERWORLD 制造商全称:Superworld Electronics 功能描述:Power Transformers - Bracket TUV Type |
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