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参数资料
| 型号： | MAX16826ATJ+C24 |
| 厂商： | Maxim Integrated |
| 文件页数： | 22/26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
Switching Noise Effects
on ADC Readings
Excessive switching noise can corrupt the ADC read-
ings on the current sink MOSFET drains. Proper PCB
layout is critical to minimize this noise. The output diode
should be selected appropriately. The capacitance and
reverse recovery characteristics of the output diode
contribute to ground noise. Diodes with lower capaci-
tance and lower reverse recovery time will result in
lower current spikes at the turn on edge of the boost
switch. The lower current spike will result in lower
ground noise. Another method to reduce the ground
noise is to add a gate resistor in series with the gate of
the switching MOSFET. For most applications the gate
resistor should be in the range of 4.7 to 10ohms. Care
must be taken in selecting the gate resistor value, due
to power dissipation increase on the boost transistor. A
higher resistor value reduces the switching noise, but
power dissipation due to switching losses will increase.
The ground noise should be measured by measuring
the voltage between the ground of the input capacitor
that is farthest from the IC on the PCB and the ground
of the MAX16826. The pins 1,2 and 3 are the ground
pins of the MAX16826. To prevent problems on the
ADC readings of the MAX16826 the ground noise mea-
sured from the IC ground to the input capacitor ground
should be less than 0.5V peak to peak on a wide band-
width scope using a wide bandwidth probe. A wide
bandwidth scope must have a bandwidth greater than
150MHz.
SEPIC Topology
The SEPIC power topology is very useful when the
input voltage is expected to be higher or lower than the
output voltage of the switching regulator stage as
required by the number of LEDs used in a single string.
The SEPIC topology is more complex than the simple
boost topology and it requires the use of two additional
energy storage components, L2 and C25, in Figure 9.
V IN
L1
C25
D1
V OUT
Q1
R11
C28
R13
R15
C26
R17
R12
L2
R14
R16
R32
R33
R34
R35
GND
C27
GND
GND
GND
GND
GND
R26
R24
GND
C29
R18
R22
R20
IN
DL
RSC CS
COMP
FB
Q5
Q4
Q3
Q2
SYSTEM
DIM1
OVP
μ C
DIM
DIM2
DIM3
DIM4
DIMMING INPUTS
DR4
DR3
DR2
SDA
SCL
SDA
SCL
MAX16826
I 2 C INTERFACE
DR1
DL1
CS1
R31
R30
R29
R28
DL2
ENABLE
GND
SYNC/EN
CS2
DL3
CS3
DL4
CS4
CSS
RTCT
V CC
GND PGND
R19
R27
R25
R23
R21
C44
C43
C42
C41
C30
C33
C32
GND
GND
GND
GND
GND
GND
GND
GND
Figure 9. SEPIC-Based LED Driver
22
Maxim Integrated
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) |
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