- 您现在的位置：买卖IC网 > Datasheet目录340 > MAX16826ATJ+C24 (Maxim Integrated)IC LED DVR HB PROGR 32-HQFN Datasheet资料下载
参数资料
| 型号： | MAX16826ATJ+C24 |
| 厂商： | Maxim Integrated |
| 文件页数： | 21/26页 |
| 文件大小： | 0K |
| 描述： | IC LED DVR HB PROGR 32-HQFN |
| 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
register. First, activate standby mode and then deacti-
vate this mode using the I 2 C interface. Next, perform a
read operation on the fault status register. The old fault
information is reported in this first read operation. The
conclusion of the read operation clears the data con-
tained in the register. Subsequent read o perations con-
firm that the fault status register has been cleared.
The description of this register is as follows:
Bit 0: Overvoltage sense flag. This flag is set if the volt-
age at OVP exceeds 1.25V; switching stops until power
or the enable or standby is cycled.
? Bit 1: Not used.
Calculating the Value of Peak
Current-Limit Resistor
The value of R12 sets the peak switching current that
flows in the switching FET (Q1). Set the value of resistor
R12 using the equation below:
R12 = 0.19/(1.2 x I PK )
where I PK is the peak inductor current at minimum
input voltage and maximum load.
Boost Inductor Value
The value of the boost inductor is calculated using the
following equation:
? Bit 2: LED string 1 shorted flag. A diode short in LED
string 1 has been detected if this bit is set.
? Bit 3: LED string 2 shorted flag. A diode short in LED
L1 =
V INMIN × ( V OUT ? V INMIN )
V O UT × f SW × Δ I L
string 2 has been detected if this bit is set.
? Bit 4: LED string 3 shorted flag. A diode short in LED
string 3 has been detected if this bit is set.
? Bit 5: LED string 4 shorted flag. A diode short in LED
string 4 has been detected if this bit is set.
Register 0Bh Bit 0: Device Standby Command
When register 0Bh bit 0 is set to 1, the IC enters a low-
current standby mode. In this mode, the system clock is
off and no operation is allowed. Set this bit to 0 to leave
standby mode and back to normal operation mode.
Register 0Ch Bit 2-0: Device Revision Code
These 3 bits are a hardwired value that identifies the
IC’s revision.
Applications Information
Programming LED Currents
The MAX16826 uses sense resistors (R28, R29, R30,
R31 in the Typical Application Circuit) to set the output
current for each LED string. To set the LED current for a
particular string, connect a sense resistor across the
corresponding current-sense input (CS1 –CS4) and
GND. For optimal accuracy, connect the low-side of the
current-sense resistors to GND with short traces. The
value needed for the sense resistor for a given current
is calculated with the equation below:
R31 = V CS1 /I OUT1
where V CS1 can be set from 97mV to 316mV by the
internal registers through the I 2 C interface and I OUT1 is
the desired LED string 1 current.
Maxim Integrated
where V INMIN is the minimum input voltage, V OUT is the
desired output voltage, and f SW is the switching fre-
quency, and Δ I L is the peak-to-peak ripple in the boost
inductor. Higher inductor values lead to lower ripple but
at a higher cost and size. Choose an inductor value
that gives peak-to-peak ripple current in the order of
30% to 40% of the average current in the inductor at
low-line and full-rated load. This choice of inductor is a
compromise between cost, size, and performance for
the boost converter.
Setting Output Voltage
Set the switch regulator output voltage by connecting
FB to the center of a resistive voltage-divider between
the switching regulator output and GND. V FB is regulat-
ed to a voltage from 0.88V to 1.25V (typ) set by an
internal register through the I 2 C interface. Choose R13
and R14 in the Typical Application Circuit for a reason-
able bias current in the resistive divider and use the fol-
lowing formula to set the output voltage:
V OUT = (1 + R13/R14) x V FB
where V FB is the regulated voltage set by the internal
register.
Adaptive Voltage Optimization
The availability of the digitized switching regulator output
voltage and current sink drain voltages and the ability to
change the switching regulator output voltage provide
the ability to do adaptive voltage optimization. A slow
digital control loop is established with an external μC
closing the loop. Firmware residing in the external μC is
tasked to read each one of the current sink FET drain
voltages and select the minimum value of the four LED
strings. The minimum value is subtracted from the scaled
output voltage reading, and then the switching regulator
output is forced to maintain the difference required to
provide current regulation in the current sink FETs.
21
相关PDF资料 |
PDF描述 |
|---|---|
| MAX16835ATE+T | IC LED DRIVR HIGH BRIGHT 16-TQFN |
| MAX16838AUP+ | IC LED DRIVR HIGH BRIGHT 20TSSOP |
| MAX1698EUB | IC LED DRVR WT/CLR BCKLGT 10MSOP |
| MAX17014EVKIT+ | KIT EVAL FOR MAX17014 |
| MAX17061AETI+T | IC LED DRVR WHITE BCKLGT 28-TQFN |
相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX16826BATJ/V+ | 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 |
| MAX16826BATJ/V+T | 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 |
| MAX16826BATJ+ | 制造商:Maxim Integrated Products 功能描述:PROGRAMMABLE, FOUR-STRING HB LED DRIVER WITH OUTPUT-VOLTAGE - Rail/Tube |
| MAX16826BATJ+T | 制造商:Maxim Integrated Products 功能描述:PROGRAMMABLE, FOUR-STRING HB LED DRIVER WITH OUTPUT-VOLTAGE - Tape and Reel |
| MAX16826EVKIT+ | 制造商:Maxim Integrated Products 功能描述:EVAL KIT FOR THE MAX16826 - Boxed Product (Development Kits) |
发布紧急采购，3分钟左右您将得到回复。