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| 型号： | SP7616ER-L |
| 厂商： | Exar Corporation |
| 文件页数： | 7/11页 |
| 文件大小： | 0K |
| 描述： | IC LED DRIVER LOWSIDE 4CH 8DFN |
| 产品变化通告： | Obsolescence Notification 01/Jun/2010 |
| 标准包装： | 150 |
| 恒定电流： | 是 |
| 拓扑： | 线性（LDO），低端，PWM |
| 输出数： | 4 |
| 内部驱动器： | 是 |
| 类型 - 主要： | 背光，通用 |
| 电源电压： | 4.5 V ~ 30 V |
| 输出电压： | 30V |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 8-VFDFN 裸露焊盘 |
| 供应商设备封装： | 8-DFN（3x2） |
| 包装： | 散装 |
S P 7 6 1 6
H i g h A c c u r a c y 4 - C h a n n e l L o w S i d e L E D D r i v e r f o r
C C F L R e p l a c e m e n t
THEORY OF OPERATION
I NTRODUCTION
The SP7616 is a four-channel constant current
source LED driver with programmable output
current level. The design consists of a
regulator reference voltage source, current
amplifier, and output driver. The precision
reference voltage ensures good performance
over voltage and temperature. The four
outputs are tightly coupled allowing for
I LED =
mA
I LED ≈ ( 1 V ? V MOD )
mA
excellent LED current matching.
S ETTING LED CURRENT
The current in the LED strings is set by
adjusting the R SET resistor connected between
the I SET pin and ground. The LED current is
set using the following the following equation.
K
R SET
Where:
K = Output Current Multiplication Ratio
I LED is the desired LED current
PWM D IMMING
The LED dimming control is done through the
PWM pin. The acceptable frequency range of
this signal is 100Hz to 5kHz. The acceptable
duty cycle range of the signal is 10% to 90%
at 1KHZ. When the PWM pin is driven low,
only the LED current sources are disabled
while the rest of the chip is still enabled.
A NALOG DIMMING CONTROL
Besides digital PWM control, the LED current
can be controlled continuously (from high to
low LED current) by raising the voltage at the
bottom of R SET , V MOD , from 0.0V to 1V
maximum. This configuration is shown in
figure 1 below.
Figure 1
The R SET value may be determined from the
previous equation for V MOD = 0V. The
equation below shows the effect of using a
V MOD in the circuit on the LED current.
K
R SET
Where:
1V = Typical I SET Voltage
K = Output Current Multiplication Ratio
I LED is the desired LED current
V MOD is the adjustment voltage
Note that this method of current control is not
as precise as adjusting R SET . The voltage at
the I SET pin is adjusted slightly during
manufacturing to ensure that K, the output
current multiplication ratio, is as accurate as
possible. When the SP7616 was originally
released at the end of 2006, the multiplication
ratio and I SET voltage were specified
separately. However, market feedback for
better accuracy when using R SET alone
prompted the change to the way the part is
specified today.
S HUTDOWN USING I SET PIN
In normal operation, the voltage at I SET pin is
around 1V. To ensure fast turn on at low duty
cycle and high PWM frequency, only the
output drivers are switching in PWM mode.
However, the whole chip can be shutdown by
pulling the voltage at I SET above 3V minimum.
? 2009 Exar Corporation
7/11
Rev. 2.0.4
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相关代理商/技术参数 |
参数描述 |
|---|---|
| SP7616ER-L/TR | 功能描述:LED照明驱动器 RoHS:否 制造商:STMicroelectronics 输入电压:11.5 V to 23 V 工作频率: 最大电源电流:1.7 mA 输出电流: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:SO-16N |
| SP7616ER-STE-L | 功能描述:LED照明驱动器 High Accuracy 4Ch Low Side LED Driver RoHS:否 制造商:STMicroelectronics 输入电压:11.5 V to 23 V 工作频率: 最大电源电流:1.7 mA 输出电流: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:SO-16N |
| SP7618 | 制造商:SIPEX 制造商全称:Sipex Corporation 功能描述:Evaluation Board Manual |
| SP7618_06 | 制造商:SIPEX 制造商全称:Sipex Corporation 功能描述:Evaluation Board Manual |
| SP7618EB | 功能描述:电源管理IC开发工具 Programmable LowSide Flash Driver 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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