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参数资料
| 型号： | MAX6970AAE+T |
| 厂商： | Maxim Integrated |
| 文件页数： | 8/12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： | 2,000 |
| 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： | 36V |
| 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： | 带卷 (TR) |
| 工作温度： | -40°C ~ 125°C |
8-Port, 36V Constant-Current LED Driver
N = number of MAX6970 outputs driving LEDs at the
same time (maximum is eight)
LE
OUT_
t LRF
V OUT = MAX6970 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.
LE
OUT_
t LRR
Dissipation example:
I OUT = 50mA, N = 8, DUTY = 1, V OUT = 2V, V+ = 5.25V
P D = (5.25V x 25mA) + (2V x 1 x 50mA x 8) = 0.931W.
Thus, for a 16-pin TSSOP package (T JA = 1 / 0.0213 =
CLK
OUT_
t CRF
+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 + (0.931 x
46.95°C/W)
so T A = +106.3°C.
CLK
t CRR
OUT_
Figure 3. LE and CLK to OUT_ Timing
Applications Information
Selecting External Component R SET to Set
LED Output Current
The MAX6970 uses an external resistor R SET to set the
LED current for outputs OUT0 to OUT7. The minimum
allowed value of R SET is 327.3 Ω , which sets the output
currents up to 55mA. The reference value, 360 Ω , sets
the output currents to 50mA. To set a different output
current, use the formula:
R SET = 18,000 / I OUT
where I OUT is the desired output current in mA.
Computing Power Dissipation
The upper limit for power dissipation (P D ) for the
MAX6970 is determined from 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
Overtemperature Cutoff
The MAX6970 contains an internal temperature sensor
that turns off all outputs when the die temperature
exceeds approximately +165°C. The outputs are re-
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 is the load LEDs cycling between on and
off as the driver repeatedly overheats and cools, alter-
nately turning the LEDs off and then back on again.
Power-Supply Considerations
The MAX6970 operates with a chip supply V+, and one
or more LED supplies. Bypass each supply to GND
with a 0.1μF capacitor as close to the MAX6970 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 four to 16 MAX6970s.
The necessary capacitance depends on the LED load
current, PWM switching frequency, and serial-interface
speed. Inadequate V+ decoupling can cause timing
problems, and very noisy LED supplies can affect LED
current regulation.
Chip Information
PROCESS: BiCMOS
8
_______________________________________________________________________________________
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX6970APE | 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 |
| MAX6970AUE | 功能描述:LED照明驱动器 8-Port 36V 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 |
| MAX6970AUE+ | 功能描述:LED照明驱动器 8-Port 36V 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 |
| MAX6970AUE+T | 功能描述:LED照明驱动器 8-Port 36V 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 |
| MAX6970AUE-T | 功能描述:LED照明驱动器 8-Port 36V 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 |
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