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24-Output PWM LED Drivers
for Message Boards
Use the same length interface signal paths, whether
differential or CMOS, to ensure a uniform propagation
delay for each signal.
Power-Supply Considerations
The MAX6974/MAX6975 operate with a power-supply
voltage of 3.0V to 3.6V. Bypass the V DD power supply
to GND with a 0.1μF ceramic capacitor as close as
possible to the device pins. If the LED supply is shared
with the V DD supply, adequately decouple the V DD
Example of using an external npn transistor:
V DD = 3.3V ±5%, I OUT = 30mA, external pass transistor
V BE = 0.7V to 1V at 30mA emitter current.
For best output current accuracy, design V O to be at
least 1.2V:
R1 (MAX) = (3.15 - 1 - 1.2) / 0.030 = 31.7 Ω , so choose
R1 = 30 Ω.
supply with bulk capacitance to ensure that the fast-
rising, high-current LED drive currents do not cause
transient dips in V DD .
Driving LEDs from a Supply Higher than 7V
An external npn transistor in a cascode configuration
+3.3V
V DD
MAX6974
MAX6975
+3.3V
Q1
+24V
extends the output drive voltage above 7V. The external
pass transistor ’s emitter clamps to a V BE below its
R1
base, which is connected to the MAX6974/MAX6975’s
supply voltage. An optional emitter resistor reduces the
voltage drop across the MAX6974/MAX6975’s output
transistor and effectively takes the dissipation off the
device into the resistor. The external transistor’s collector
current is equal to its emitter current (less a small base
current), and the MAX6974/MAX6975 accurately
GND
R0
R1
R2
R3
R4
R5
R6
R7
30mA
control the emitter current with a constant current sink
driver structure.
SYSTEM
Figure 13. External Cascode npn Transistor
Typical Operating Circuit
MAX6974
MAX6974
CLK
DATA
LOAD
CLKI
DINI
LOADI
CLKO
DINO
LOADO
CLKI
DINI
LOADI
CLKO
DINO
LOADO
8 RGB LEDs
PROCESS: BiCMOS
R0/G0/B0
R1/G1/B1
R2/G2/B2
R3/G3/B3
R4/G4/B4
R5/G5/B5
R6/G6/B6
R7/G7/B7
Chip Information
R0/G0/B0
R1/G1/B1
R2/G2/B2
R3/G3/B3
R4/G4/B4
R5/G5/B5
R6/G6/B6
R7/G7/B7
______________________________________________________________________________________
21
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相关代理商/技术参数
MAX6974ATL+T 功能描述:LED照明驱动器 24-Output PWM 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
MAX6974ATL-T 制造商:Maxim Integrated Products 功能描述:24-OUTPUT PWM LED DRIVERS FOR MESSA - Tape and Reel
MAX6974EVKIT 功能描述:LED 照明开发工具 MAX6974 Evaluation Kit RoHS:否 制造商:Fairchild Semiconductor 产品:Evaluation Kits 用于:FL7732 核心: 电源电压:120V 系列: 封装:
MAX6974EVKIT+ 功能描述:LED 照明开发工具 MAX6974 Evaluation Kit RoHS:否 制造商:Fairchild Semiconductor 产品:Evaluation Kits 用于:FL7732 核心: 电源电压:120V 系列: 封装:
MAX6975ATL 功能描述:LED显示驱动器 RoHS:否 制造商:Micrel 数位数量:5 片段数量: 安装风格:SMD/SMT 封装 / 箱体:PLCC-44 工作电源电压:4.75 V to 11 V 最大电源电流:10 mA 最大工作温度:+ 85 C 最小工作温度:- 40 C 封装:Tube
MAX6975ATL+ 功能描述:LED照明驱动器 24-Output PWM 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
MAX6975ATL+T 功能描述:LED照明驱动器 24-Output PWM 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
MAX6975ATL-T 功能描述:LED显示驱动器 RoHS:否 制造商:Micrel 数位数量:5 片段数量: 安装风格:SMD/SMT 封装 / 箱体:PLCC-44 工作电源电压:4.75 V to 11 V 最大电源电流:10 mA 最大工作温度:+ 85 C 最小工作温度:- 40 C 封装:Tube