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参数资料
| 型号： | MAX16832AASA+ |
| 厂商： | Maxim Integrated |
| 文件页数： | 8/10页 |
| 文件大小： | 0K |
| 描述： | IC LED DRIVER HIGH BRIGHT 8-SOIC |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 100 |
| 恒定电流： | 是 |
| 拓扑： | PWM，降压（降压） |
| 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： | 2MHz |
| 电源电压： | 6.5 V ~ 65 V |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 8-SOIC（0.154"，3.90mm Width）裸露焊盘 |
| 供应商设备封装： | 8-SOICN 裸露焊盘 |
| 包装： | 管件 |
| 工作温度： | -40°C ~ 125°C |
2MHz, High-Brightness LED Drivers with
Integrated MOSFET and High-Side Current Sense
HYSTERETIC
MODE
I LED
f SW
? I
AVG. LED
CURRENT
t
V DIM
t1
Figure 2. Current-Regulator Operation
t2
t
Freewheeling-Diode Selection
For stability and best efficiency, a low forward-voltage
drop diode with fast reverse-recovery time and low
capacitance is recommended. A Schottky diode is a
good choice as long as its breakdown voltage is high
enough to withstand the maximum operating voltage.
PCB Layout Guidelines
Careful PCB layout is critical to achieve low switching
losses and stable operation. In normal operation, there
are two power loops. One is formed when the internal
MOSFET is on and the high current flows from ground
through the input cap, R SENSE , the LED load, the
inductor, and the internal MOSFET back to ground. The
second loop is formed when the internal MOSFET is off
and the high current circulates from the input cap posi-
tive terminal through R SENSE , the LED load, the induc-
tor, and the freewheeling diode and back to the input
cap positive terminal. Note that the current through
R SENSE , the LED load, and the inductor is basically DC
with some triangular ripple (low noise). The high-noise,
large signal, fast transition switching currents only flow
through the freewheeling diode to the input cap positive
8
terminal, or through the MOSFET to ground and then to
the input cap positive terminal. Without a proper PCB
layout, these square-wave switching currents can cre-
ate problems in a hysteretic LED driver.
The current control depends solely on the voltage
across R SENSE . Any noise pickup on this node induces
erratic switching of the internal MOSFET (the IC will
operate at a much higher frequency). To help prevent
this, place R SENSE as close as possible to CS and IN
and keep the sense traces short. It is especially impor-
tant to keep the square-wave switching currents in the
freewheeling diode away from R SENSE . To minimize
interference, place the freewheeling diode on the oppo-
site side of the IC as R SENSE and position the input
capacitor near the diode so it can return the high fre-
quency currents to ground. The layout in Figure 3
should be used as a guideline. The dashed line shows
the path of the high frequency components that cause
disruption in operation. For a good thermal design, the
exposed pad on the IC should solder to a large pad
with many vias to the backside ground plane.
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX16832AASA/V+ | 制造商:Maxim Integrated Products 功能描述:2MHZ, HIGH-BRIGHTNESS LED DRIVER WITH INTEGRATED MOSFET AND - Rail/Tube |
| MAX16832AASA+ | 功能描述:LED照明驱动器 Ic Led Drvr High Bright 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 |
| MAX16832AASA+T | 功能描述:LED照明驱动器 Ic Led Drvr High Bright 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 |
| MAX16832CASA+ | 功能描述:LED照明驱动器 Ic Led Drvr High Bright 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 |
| MAX16832CASA+T | 功能描述:LED照明驱动器 Ic Led Drvr High Bright 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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