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参数资料
| 型号： | MAX6968AAE+ |
| 厂商： | Maxim Integrated |
| 文件页数： | 9/13页 |
| 文件大小： | 0K |
| 描述： | IC LED DRIVER LINEAR 16-SSOP |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 76 |
| 恒定电流： | 是 |
| 拓扑： | 线性，高端 |
| 输出数： | 8 |
| 内部驱动器： | 是 |
| 类型 - 主要： | LED 照明显示器，标牌，汽车 |
| 电源电压： | 3 V ~ 5.5 V |
| 输出电压： | 5.5V |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 16-SSOP（0.209"，5.30mm 宽） |
| 供应商设备封装： | 16-SSOP |
| 包装： | 管件 |
| 工作温度： | -40°C ~ 125°C |
8-Port, 5.5V Constant-Current LED Driver
Applications Information
Selecting External Component R SET to Set
LED Output Current
The MAX6968 uses an external resistor R SET to set the
LED current for outputs OUT0 – OUT7. The minimum
allowed value of R SET is 307.6 ? , which sets the output
currents to 55mA. The maximum allowed value of R SET
is 1.5k ? . The reference value, 360 ? , sets the output
currents to 50mA. To set a different output current, use
Overtemperature Cutoff
The MAX6968 contains an internal temperature sensor
that turns off all outputs when the die temperature
exceeds approximately +165 ° C. The outputs are
enabled again when the die temperature drops below
approximately +140 ° C. Register contents are not
affected, so when a driver is overdissipating, the exter-
nal symptom will be the load LEDs cycling between on
and off as the driver repeatedly overheats and cools,
alternately turning the LEDs off and then back on again.
the formula:
R SET = 18,000 / I OUT
Power-Supply Considerations
The MAX6968 operates with a chip supply V+, and one
where I OUT is the desired output current in mA.
Computing Power Dissipation
The upper limit for power dissipation (P D ) for the
MAX6968 is determined by the following equation:
P D = (V+ x I+) + (V OUT x DUTY x I OUT x N)
where:
V+ = supply voltage
I+ = operating supply current when sinking I OUT LED
drive current into N outputs
DUTY = PWM duty cycle applied to OE
N = number of MAX6968 outputs driving LEDs at the
same time (maximum is 8)
V OUT = MAX6968 port output voltage when driving load
LED(s)
I OUT = LED drive current programmed by R SET
P D = power dissipation, in mW if currents are in mA
Dissipation example:
I OUT = 47mA, N = 8, DUTY = 1, V OUT = 2V, V+ = 5.25V
P D = (5.25V x 25mA) + (2V x 1 x 47mA x 8) = 0.883W
Thus, for a 16-pin TSSOP package (T JA = 1 / 0.0213 =
+46.95 ° C/W from the Absolute Maximum Ratings ), the
maximum allowed ambient temperature T A is given by:
T J(MAX) = T A + (P D x T JA ) = +150 ° C =
T A + (0.883 x 46.95 ° C/W)
so T A = +108.5 ° C.
or more LED supplies. Bypass each supply to GND
with a 0.1μF capacitor as close to the MAX6968 as pos-
sible. This is normally adequate for static LED driving.
For multiplex or PWM applications, it is necessary to
add an additional bulk electrolytic capacitor of 4.7μF or
more to each supply for every 4 to 16 MAX6968s. The
necessary capacitance depends on the LED load cur-
rent, PWM switching frequency, and serial-interface
speed. Inadequate V+ decoupling can cause timing
problems, and very noisy LED supplies can affect LED
current regulation.
For the TSSOP version, connect the underside exposed
pad to GND.
Chip Information
TRANSISTOR COUNT: 2382
PROCESS: BiCMOS
_______________________________________________________________________________________
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX6968AAE+ | 功能描述:LED显示驱动器 8-Port 5.5V Constant Current LED Driver 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 |
| MAX6968AAE+T | 功能描述:LED显示驱动器 8-Port 5.5V Constant Current LED Driver 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 |
| MAX6968AAE-T | 功能描述:LED显示驱动器 8-Port 5.5V Constant Current LED Driver 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 |
| MAX6968AEE | 制造商:Maxim Integrated Products 功能描述:8-PORT, 5.5V CONSTANT-CURRENT LED DRIVER - Rail/Tube |
| MAX6968AEE+ | 制造商:Maxim Integrated Products 功能描述:- Rail/Tube |
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