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Setting LED String Currents
The maximum string current, I LED , for each string is
set by a resistor, R Sn , connected to ground from the
source terminal of the external string drive MOSFET.
The feedback threshold is 500mV. Determine the
resistor value using:
where V f(MIN) and V f(MAX) are the LED minimum and
maximum forward voltage drops at the peak current
set by R Sn (page_). For example, if the LED data are
V f(MIN) = 3.5V and V f(MAX) = 3.8V, and ten LEDs are
used in a string, then the total minimum and maximum
R Sn =
0.5
ohms. I LED
,
where I LED is in amperes and R Sn is in
voltage drops across a string are 35V and 38V,
respectively. Adding an allowance of 0.5V for the string
drive MOSFET headroom brings V OUT(MIN) to 35.5V and
V OUT(MAX) to 38.5V. Then, determine R TOP using:
R TOP =
V OUT ( MAX ) ? V OUT ( MIN )
I FBOn ( MAX )
For example, a full-scale LED current of 500mA
returns R Sn = 1.00 Ω . The current for the LED strings is
individually reduced from the full-scale resistor set value
with 6-bit resolution using ISTR n , the string current
control registers 0x10 through 0x1F.
Connecting an LED String Power Supply
to an Efficiency Optimizer Output
,
where I FBOn(MAX) is the 45μ A maximum output current
of the Efficiency Optimizer outputs, FBO1, FBO2, and
FBO3. Finally, determine R BOTTOM using:
The MSL2100 is designed to control up to three
external LED string power supplies that use voltage
dividers (R TOP and R BOTTOM in Figure 4) to set the output
voltage, and whose regulation feedback voltage is not
R BOTTOM = R TOP ?
V FB
V OUT ( MAX ) ? V FB
,
more than 1.5V. The Efficiency Optimizer improves
power efficiency by injecting a current of between
0 and 45μA into the voltage dividers of the external
power supplies, dynamically adjusting their outputs
to the minimum voltage required by the LED strings.
where V FB is the regulation feedback voltage of the
power supply. Place a Schottky diode (CMPSH-3 or
similar) between FBOn and the supply’s feedback node
to protect the MSL2100 against current flow into FBOn.
To select the resistors, first determine V OUT(MIN) and
V OUT(MAX) , the minimum and maximum string supply
voltage limits, using:
V OUT ( MIN ) = ( V f ( MIN ) ? [ # ofLEDs ] ) + 0 . 5 ,
and
V OUT ( MAX ) = ( V f ( MAX ) ? [ # ofLEDs ] ) + 0 . 5 ,
Figure 4. FBOn Connection to Power Supply Voltage Divider
14
Atmel LED Driver-MSL2100
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MSL2160 制造商:未知厂家 制造商全称:未知厂家 功能描述:16-string, White and RGB LED Drivers with Adaptive Configuration,EEPROM, and SPI/I2C/SMBus Serial Interface
MSL2160DQ 功能描述:LED照明驱动器 16-StringRGBLED Dvrs AdapPwrContr E2Prom 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
MSL2160DQ-R 功能描述:LED照明驱动器 16String White & RGB LED Drivers with A 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
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MSL2161DQ 功能描述:LED照明驱动器 16String White & RGB LED Drivers with A 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
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