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参数资料
| 型号： | MAX6975ATL+T |
| 厂商： | Maxim Integrated |
| 文件页数： | 10/23页 |
| 文件大小： | 0K |
| 描述： | IC LED DRIVER LINEAR 40-TQFN |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 2,500 |
| 拓扑： | PWM |
| 输出数： | 24 |
| 内部驱动器： | 是 |
| 类型 - 主要： | 通用 |
| 类型 - 次要： | RGB |
| 频率： | 33MHz |
| 电源电压： | 3 V ~ 3.6 V |
| 输出电压： | 7V |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 40-WFQFN 裸露焊盘 |
| 供应商设备封装： | 40-TQFN-EP（6x6） |
| 包装： | 带卷 (TR) |
| 工作温度： | -40°C ~ 125°C |
24-Output PWM LED Drivers
for Message Boards
(PWM) value. Each output current driver in the R, G,
and B ports has a unique 12-bit (MAX6974) or 14-bit
(MAX6975) PWM control value providing fine resolution
adjustment of average current output. Each bit time of
the PWM corresponds to one period of CLKI (T CLKI ).
The PWM setting determines the amount of time, out of
the total period, that the output is on. The subframes
have PWM off-zones at the start (t SPWM ) and end
(t EPWM ) of the PWM period (see Figure 3). The sub-
frame period and PWM off zones are shown in Table 2
for each device.
The MAX6974 subdivides each subframe by 4096
(12-bit) PWM steps and has 16 cycle off zones, leaving
an active PWM region of 4064 PWM steps ranging from
Table 2. Subframe and PWM Timing
16 to 4079. The MAX6975 subdivides each subframe
by 16,384 (14-bit) PWM steps and has 32 cycle off
zones, leaving an active PWM region of 16,320 PWM
steps ranging from 32 to 16,351. The PWM phase for
outputs R0, R2, R4, R6, G0, G2, G4, G6, B0, B2, B4,
and B6 use phasing with the outputs on first and off
second. Inverse phasing is used for outputs R1, R3,
R5, R7, G1, G3, G5, G7, B1, B3, B5, and B7 as shown
in Figure 3 to balance the timing of loads on the LED
anode power supply.
In multiplexed operation, the subframes are shared
between MUX0 and MUX1 active times, effectively
reducing the number of subframes by 2.
LED-Intensity Control Example
The three levels of intensity control are shown in Figure 2
PART
MAX6974
MAX6975
SUBFRAME
(T CLKI )
4096
16,384
t SPWM
(T CLKI )
16
32
t EPWM
(T CLKI )
16
32
t EMUX
(T CLKI )
16
32
for one LED output driver in a MAX6974 in nonmulti-
plexed mode. As an example, the CALDAC is set to
169 DEC, setting the port output current level to 21.8mA.
The global-intensity PDM value is set to 96 DEC , producing
an even distribution of ON subframes out of the 128
MULTIPLEXED
SUBFRAME (n), MUX0
SUBFRAME (n), MUX1
t EMUX
MUX0
t EMUX
MUX1
R0, R2, R4, R6
t SPWM
t SPWM
G0, G2, G4, G6
B0, B2, B4, B6
50%
75%
R1, R3, R5, R7
G1, G3, G5, G7
B1, B3, B5, B7
ON/OFF PHASING
OFF/ON PHASING
NONMULTIPLEXED
25%
t SPWM
100%
t EPWM
R0, R2, R4, R6
t SPWM
SUBFRAME (n)
t EPWM
SUBFRAME (n + 1)
G0, G2, G4, G6
75%
75%
B0, B2, B4, B6
ON/OFF PHASING
R1, R3, R5, R7
G1, G3, G5, G7
75%
75%
B1, B3, B5, B7
OFF/ON PHASING
Figure 3. Multiplexed and Nonmultiplexed Output Driver Phasing and Example PWM Values
10
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| MAX6974ATL+T | IC LED DRIVER LINEAR 40-TQFN |
相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX6977AAE | 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 |
| MAX6977AAE+ | 功能描述:LED照明驱动器 8-Port 5.5V Constant Current 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 |
| MAX6977AAE+T | 功能描述:LED照明驱动器 8-Port 5.5V Constant Current 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 |
| MAX6977AAE-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 |
| MAX6977AEE | 制造商:Maxim Integrated Products 功能描述:8-PORT, 5.5V CONSTANT-CURRENT LED DRIVER WITH - Rail/Tube |
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