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Atmel LED Driver-MSL2162
16-string White and RGB LED Driver with
Adaptive Configuration, EEPROM, and SPI Bus
Using Multiple Atmel LED Driver-MSL2162s to Control a Common Power Supply
Multiple MSL2162s connect in a chain configuration to control a single string power supply (Figure 5) when driving more
than 16 LED stings. Cascade multiple devices with the FBI1 of one device connected to the FBO1 of the next. Connect
the first FBO1 to the power supply feedback resistor node through a diode, and the unused FBI1 input to ground as close
to the MSL2162 as possible. Assure that all strings powered by the common supply are assigned to FBO1 using String
Set registers (STRnSET) 0x40 - 0x5F (FBO1 is the power-up default setting for all strings). The chained devices work
together to ensure that the system operates at optimum efficiency. Note that the accuracy of the feedback chain may
degrade through each link of the FBI1/FBO1 chain by as much as 2%. Determine the potential worst case maximum
FBO1 current I FBOn(MAX/MIN) using:
I FBOn(MAX / MIN) = 255 μ A * (0.98) N -1 ,
where N is the number of MSL2162s connected in series. Use this result in the above R TOP resistor equation for the term
I FBOn(MAX) instead of using 255μA.
Take care in laying out the traces for the Efficiency Optimizer connections. Minimize the FBI1/FBO1 trace lengths as much
as possible. Do not route the signals close to traces with large variations in voltage or current, because noise may couple
into FBI1. If these traces must be routed near noisy signals, shield them from noise by using ground planes or guard
traces. Note that Figure 5 also shows the connections for an unused string.
VOUT
STRING
POWER
SUPPLY
FB
R TOP
R BOTTOM
1N4148
G0
FBO1
G15
FBI1
G0
FBO1
G15
FBI1
G0
FBO1
G14
FBI1
FBO2
DEVICE 1
MSL2162
FBO2
DEVICE 2
MSL2162
FBO2
DEVICE N
G15
D15
S15
MSL2162
Figure 5. Example of Cascading Multiple Devices to Optimize a Common String Power Supply
Atmel LED Driver-MSL2162
19
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功能描述:LED照明驱动器 16-String LED Driver Mult-PWM Modes 3FO 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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