参数资料
型号: MAX16809ATU+T
厂商: Maxim Integrated
文件页数: 16/20页
文件大小: 0K
描述: IC LED DRVR WT/RGB BCKLT 38-TQFN
产品培训模块: Lead (SnPb) Finish for COTS
Obsolescence Mitigation Program
标准包装: 2,500
恒定电流:
拓扑: 开路漏极,PWM,降压(降压),SEPIC,升压(升压)
输出数: 16
内部驱动器:
类型 - 主要: 背光
类型 - 次要: RGB,白色 LED
频率: 20kHz ~ 1MHz
电源电压: 8 V ~ 26.5 V
输出电压: 36V
安装类型: 表面贴装
封装/外壳: 38-WFQFN 裸露焊盘
供应商设备封装: 38-TQFN(5x7)
包装: 带卷 (TR)
工作温度: -40°C ~ 125°C
Integrated 16-Channel LED Driver with
Switch-Mode Boost and SEPIC Controller
LE
t LW
t CL
t CH
t CP
t LS
CLK
t DH
t DS
DIN
D15
D14
D1
D0
t DO
DOUT
OE
OUT_ _
t OEF
t F
t OEW
80%
20%
t OER
t R
D15
Figure 3. 4-Wire Serial-Interface Timing Diagram
Selecting External Component
R SET to Set LED Output Current
LE
OUT_ _
t LRF
The MAX16809 uses an external resistor, R SET , to set
the LED current for outputs OUT0–OUT15. The mini-
mum allowed value of R SET is 311 Ω , which sets the out-
put currents to 55mA. The maximum allowed value of
R SET is 5k Ω (I OUT_ _ = 3.6mA) and the maximum
LE
t LRR
allowed capacitance at SET is 100pF.
Use the following formula to set the output current:
OUT_ _
CLK
R SET =
17,100 V
I OUT _ _
OUT_ _
t CRF
where I OUT_ _ is the desired output current in milliamps
and the value for R SET is in ohms.
Overtemperature Cutoff
CLK
t CRR
OUT_ _
Figure 4. LE and CLK to OUT_ _ Timing
The MAX16809 contains an internal temperature sensor
that turns off all outputs when the die temperature
exceeds +165°C. The outputs are enabled again when
the die temperature drops below +140°C. Register con-
tents are not affected, so when a driver is overdissipat-
ing, the external symptom is the load LEDs cycling on
and off as the driver repeatedly overheats and cools,
alternately turning itself off and then back on again.
16
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