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参数资料
| 型号： | MAX16816ATJ+T |
| 厂商： | Maxim Integrated |
| 文件页数： | 17/33页 |
| 文件大小： | 0K |
| 描述： | IC LED DRIVR HIGH BRIGHT 32-TQFN |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 2,500 |
| 拓扑： | PWM，SEPIC，降压（降压），升压（升压） |
| 输出数： | 1 |
| 内部驱动器： | 是 |
| 类型 - 主要： | 车载 |
| 类型 - 次要： | 高亮度 LED（HBLED） |
| 频率： | 125kHz ~ 500kHz |
| 电源电压： | 5.5 V ~ 76 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（5x5） |
| 包装： | 带卷 (TR) |
| 工作温度： | -40°C ~ 125°C |
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Programmable Switch-Mode LED Driver
with Analog-Controlled PWM Dimming
an analog control signal is applied to DIM, the
MAX16816 compares the DC input to an internally gen-
erated 200Hz ramp to pulse-width modulate the LED
current (f DIM = 200Hz). The output current duty cycle is
linearly adjustable from 0 to 100% (0.2V < V DIM < 2.8V).
Use the following formula to calculate voltage, V DIM ,
necessary for a given output current duty cycle, D:
V DIM = (D x 2.6) + 0.2V
where V DIM is the voltage applied to DIM in volts.
Connect DIM to REF through a resistive voltage-divider
to apply a DC DIM control signal (Figure 2). Use the
required dimming input voltage, V DIM , calculated
above and select appropriate resistor values using the
following equation:
R 4 = R 3 x V DIM / (V REF - V DIM )
where V REF is the 3V reference output voltage and
15k Ω ≤ R 3 + R 4 ≤ 150k Ω .
A minimum 20μs pulse width is necessary for proper
operation during dimming.
Oscillator, Clock, and Synchronization
The MAX16816 is capable of stand-alone operation, of
synchronizing to an external clock, and of driving exter-
nal devices in SYNC mode. For stand-alone operation,
set the EEPROM Oscillator Enable/Disable (RTOF) bit
to ‘1’ to use the fixed internal 125kHz oscillator or set
RTOF to ‘0’ and program the switching frequency by
connecting a single external resistor, R T , between
RTSYNC and ground. Select a switching frequency,
f SW , between 125kHz and 500kHz and calculate R T
using the following formula:
To synchronize the MAX16816 with an external clock
signal ranging from 125kHz to 500kHz, set the RTOF bit
to ‘0 ’ and connect the clock signal to the RTSYNC
input. The MAX16816 synchronizes to the clock signal
after the detection of 5 successive clock edges at
RTSYNC.
A buffered clock output, CLKOUT, can drive the
RTSYNC input of an external PWM controller for multi-
channel applications. CLKOUT can drive capacitive
loads up to 500pF.
If the PWM switching frequency is set to 125kHz, the
RTSYNC oscillator can be temporarily disabled by setting
the EEPROM RTOF bit to ‘1’. In this case, the internal
125kHz frequency-fixed oscillator drives the PWM. See the
EEPROM and Programming section for more information
on setting the Oscillator Enable/Disable bit in the EEPROM.
Multichannel Configuration
The MAX16816 is capable of multichannel operation
and is configurable as a master or slave in a Master-
Slave configuration, or in a Peer-to-Peer configuration.
Connect CLKOUT to the SYNC input of an external
device to use the MAX16816 as a master clock signal.
Connect an external clock signal to RTSYNC to config-
ure the MAX16816 as a slave. To setup two MAX16816
devices in a daisy-chain configuration, drive the
RTSYNC input of one MAX16816 with the CLKOUT
buffer of another (Figure 3).
ILIM and HICCUP Comparator
R SENSE sets the peak current through the inductor for
switching. The differential voltage across R SENSE is
compared to the 200mV voltage-trip limit of the current-
limit comparator, ILIM. Set the current limit 20% higher
R T =
500kHz
f SW
× 2 5 k Ω
than the peak switch current at the rated output power
and minimum voltage. Use the following equation to
calculate R SENSE :
where the switching frequency is in kHz and R T is in k Ω .
R SENSE = V SENSE / (1.2 x I PEAK )
R 3
REF
DIM
MAX16816
MASTER/PEER
MAX16816
SLAVE/PEER
MAX16816
AGND
RTSYNC
CLKOUT
RTSYNC
CLKOUT
R 4
R T
Figure 2. Creating DIM Input Signal from REF
Figure 3. Master-Slave/Peer-Peer Clock Configuration
______________________________________________________________________________________
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX16816EVKIT+ | 功能描述:LED 照明开发工具 MAX16816 Eval Kit RoHS:否 制造商:Fairchild Semiconductor 产品:Evaluation Kits 用于:FL7732 核心: 电源电压:120V 系列: 封装: |
| MAX16818ATI+ | 功能描述:LED照明驱动器 1.5MHz 30A w/Rapid LED Current Pulsing 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 |
| MAX16818ATI+T | 功能描述:LED照明驱动器 1.5MHz 30A w/Rapid LED Current Pulsing 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 |
| MAX16818ETI+ | 功能描述:LED照明驱动器 1.5MHz 30A w/Rapid LED Current Pulsing 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 |
| MAX16818ETI+T | 功能描述:LED照明驱动器 1.5MHz 30A w/Rapid LED Current Pulsing 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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