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参数资料
| 型号： | MAX16826ATJ+ |
| 厂商： | Maxim Integrated |
| 文件页数： | 16/26页 |
| 文件大小： | 0K |
| 描述： | IC LED DVR HB PROGR 32TQFN-EP |
| 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： | PWM，SEPIC，升压（升压） |
| 输出数： | 4 |
| 内部驱动器： | 无 |
| 类型 - 主要： | 车载，背光 |
| 类型 - 次要： | 高亮度 LED（HBLED），RGB，白色 LED |
| 频率： | 100kHz ~ 1MHz |
| 电源电压： | 4.75 V ~ 24 V |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 32-WFQFN 裸露焊盘 |
| 供应商设备封装： | 32-TQFN-EP |
| 包装： | 托盘 |
| 工作温度： | -40°C ~ 125°C |
MAX16826
Programmable, Four-String HB LED Driver with
Output-Voltage Optimization and Fault Detection
is 2μs, so the ADC requires at least 5 of these minimum
pulses within the 190ms measurement window to com-
plete a conversion. During PWM dimming, LED current
pulse widths of less than 2μs are possible, but the ADC
may not have enough sampling time to complete a con-
version in this scenario and the corresponding data may
be incomplete or inaccurate. Therefore, adaptive volt-
age optimization may not be possible when the LED
current-pulse duration is less than 2μs. The LED current
pulse duration is shorter than the pulse applied at the
DIM_ inputs because of the LED turn-on delay.
Faults and Fault Detection
The MAX16826 features circuitry that automatically
detects faults such as overvoltage or shorted LED string.
An internal fault register at the address OAh is used to
record these faults. For example, if a shorted LED string
is detected, the corresponding fault register bit is set and
the faulty output is shut down.
Shorted LED strings are detected with fast comparators
connected to DR1–DR4. The trip threshold of these
comparators is 1.52V (typ). When this threshold is
ADC
EXTERNAL
exceeded, the shorted string is latched off and the cor-
responding bit of register OAh is set.
After the internal ADC completes a conversion, the
result is stored in the corresponding register and can
be read out by the external μC. The μC then compares
the conversion data with the preset limit to determine if
there is a fault.
When an LED string opens, the voltage at the corre-
sponding current-sink FET drain node goes to 0V.
However, the ADC can only complete a conversion if
the LED current comes into regulation. If an LED string
opens before the LED current can come into regulation,
the ADC cannot complete a conversion and the MSB
(eighth bit) is set to indicate an incomplete conversion
or timeout condition. Thus, an examination of the MSB
provides an indication that the LED string is open. If the
LED string opens after the LED current is in regulation,
the ADC can make conversions and reports that the
drain voltage is 0V. Therefore, to detect an open condi-
tion, monitor the MSB and the ADC measurement. If the
MSB is set and the CS_ on-time is greater than 2μs, or
if the ADC measures 0 at the drain, then there is an
open circuit.
DAC
EVENTS
REGISTER
OVP
FILE UNIT
SYSTEM
CLOCK
I 2 C
Figure 3. Digital Block Diagram
Table 1. ADC Response
POWER
MANAGEMENT
CONDITION
Shorted string fault
Shorted string fault while
converting
ADC register read when it is
being updated
UVLO
STBY
SHDN
16
ADC RESPONSE
Load full-scale code into register, no conversions on affected channel until power or enable is
cycled.
Immediately load full-scale code into register and cease conversion effort on this channel until
power or enable is cycled.
Previous sample is shifted out through the I 2 C interface and then the register is updated with the
new measurement.
Immediately terminate conversions, do not update current register.
Immediately terminate conversions, do not update current register.
Immediately terminate conversions, do not update current register.
Maxim Integrated
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX16826ATJ/V+ | 制造商:Maxim Integrated Products 功能描述:PROGRAMMABLE, FOUR-STRING HB LED DRIVER WITH OUTPUT-VOLTAGE - Rail/Tube |
| MAX16826ATJ/V+T | 制造商:Maxim Integrated Products 功能描述:PROGRAMMABLE, FOUR-STRING HB LED DRIVER WITH OUTPUT-VOLTAGE - Tape and Reel |
| MAX16826ATJ/VY+ | 制造商:Maxim Integrated Products 功能描述:PROGRAMMABLE, FOUR-STRING HB LED DRIVER WITH OUTPUT-VOLTAGE - Rail/Tube |
| MAX16826ATJ/VY+T | 制造商:Maxim Integrated Products 功能描述:PROGRAMMABLE, FOUR-STRING HB LED DRIVER WITH OUTPUT-VOLTAGE - Tape and Reel |
| MAX16826ATJ+ | 功能描述:LED照明驱动器 Prog 4-String HB 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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