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| 型号： | MAX16823ATE/V+ |
| 厂商： | Maxim Integrated |
| 文件页数： | 6/12页 |
| 文件大小： | 0K |
| 描述： | IC LED DRIVER HIGH BRIGHT 16WQFN |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 60 |
| 恒定电流： | 是 |
| 拓扑： | 线性（LDO），开路漏极，PWM |
| 输出数： | 3 |
| 内部驱动器： | 是 |
| 类型 - 主要： | 车载 |
| 类型 - 次要： | 高亮度 LED（HBLED），RGB |
| 电源电压： | 5.5 V ~ 40 V |
| 输出电压： | 3.41V |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 16-WQFN 裸露焊盘 |
| 供应商设备封装： | 16-TQFN-EP（5x5） |
| 包装： | 管件 |
| 工作温度： | -40°C ~ 125°C |
High-Voltage, 3-Channel Linear High-Brightness
LED Driver with Open LED Detection
Detailed Description
The MAX16823 three-channel current regulator operates
from a 5.5V to 40V input voltage range and delivers up
to 100mA per channel to one or more strings of
HBLEDs. The output currents are programmable using
external current-sense resistors in series with the LEDs.
Three DIM inputs allow a wide range of independent
pulsed dimming in addition to providing the on and off
control of the outputs. The MAX16823 offers an LED-
GOOD output that indicates an open-circuit condition
when one or more LED channels are open.
Applications Information
Programming the LED Current
The MAX16823 uses sense resistors to set the output
current for each channel. To set the LED current for a
particular channel, connect a sense resistor across the
corresponding current-sense input (CS_) and GND. For
optimal accuracy, connect the low-side of the current-
sense resistors to the IC’s ground pin with short traces.
The value needed for the sense resistor for a given cur-
rent can be calculated with the equation below:
Integrated pass elements minimize external compo-
nents while providing ± 5% output current accuracy.
Additional features include a 3.4V (±5%) voltage regula-
R CS _ ( Ω ) =
V CS _ (V)
I OUT _ ( A )
tor with 4mA output current capability, short-circuit and
thermal protection.
The MAX16823 uses a feedback loop to linearly control
the current from each output. The voltage across each
sense resistor is compared to a fixed reference voltage
and the error is amplified to drive the internal power
pass device for a particular channel. See the Block
Diagram. The regulation point is factory-set at 203mV.
The regulated current is adjusted by the value of
R CS__ .
The MAX16823 is a constant-current LED driver inter-
nally optimized for driving the impedance range
expected from one or more HBLEDs.
3.4V Regulator (REG)
The MAX16823 includes a fixed 3.4V voltage regulator
that delivers up to 4mA of load current for auxiliary
applications throughout the 5.5V to 40V input voltage
range. Connect a 0.1μF compensation capacitor from
REG to ground. Shorting REG to ground disables the
thermal shutdown.
Thermal Protection
The MAX16823 enters a thermal-shutdown mode in the
event of overheating. This typically occurs in overload or
output short-circuit conditions. When the junction temper-
ature exceeds T J = +155°C, the internal thermal protec-
tion circuitry turns off the series pass elements. The
MAX16823 recovers from thermal-shutdown mode once
the junction temperature drops by 23°C. The part will
therefore protect itself by low-frequency thermal cycling
in the event of a short-circuit or overload condition.
where V CS_ is 203mV and I OUT_ is the desired LED
current (I LED ).
Input-Voltage Considerations
For proper operation, the minimum input voltage must
always be:
V IN ( MIN ) ≥ V CS _( MAX ) + V FT ( MAX ) + V DO ( MAX )
where V FT(MAX) is the total forward voltage of all series-
connected LEDs. The minimum operating voltage of
the device is 5.5V.
LEDGOOD
The MAX16823 features an active-low, open-drain
LEDGOOD output that goes low either when one or
more LED channels are open or when a signal at any of
the dimming inputs remains low for a period greater
than the programmed LEDGOOD delay time t DELAY .
Program t DELAY with a capacitor connected between
LGC and ground. The LEDGOOD output goes low after
the programmed delay period t DELAY has elapsed. Use
the following formula to set the delay period:
t DELAY = 257 , 900 ( Ω ) × C LGC ( F )
where C LGC is the capacitor connected between LGC
and ground. The LEDGOOD output goes low during
the thermal shutdown.
6
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