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MAX16838
Integrated, 2-Channel, High-Brightness LED Driver
with High-Voltage Boost and SEPIC Controller
4.75V TO 40V
L 1
C s
D
C IN
L 2
R2 OV
C OUT
R2 EN
R1 OV
LED
STRINGS
IN
EN
DRAIN
OV
NDRV
R1 EN
C VCC
R DRV
CFB
V CC
DRV
MAX16838
GATE
OUT1
OUT2
ISET
R ISET
C DRV
FLT
R COMP
DIM
COMP
CS
RT
C COMP
SGND
PGND
LEDGND
R RT
R CS
Figure 4. SEPIC Configuration
SEPIC Operation
Figure 4 shows a SEPIC application circuit using the
MAX16838. The SEPIC topology is necessary to keep
the output voltage of the DC-DC converter regulated
when the input voltage can rise above and drop below
the output voltage.
Boost-Buck Configuration
Figure 5 shows a boost-buck configuration with the
MAX16838 and MAX15054.
PCB Layout Considerations
LED driver circuits based on the MAX16838 device use
a high-frequency switching converter to generate the
voltage for LED strings. Take proper care while laying
out the circuit to ensure proper operation. The switching-
converter part of the circuit has nodes with very fast volt-
age changes that could lead to undesirable effects on
the sensitive parts of the circuit. Follow these guidelines
to reduce noise as much as possible:
Maxim Integrated
1)
2)
Connect the bypass capacitor on V CC and DRV as
close as possible to the device, and connect the
capacitor ground to the analog ground plane using
vias close to the capacitor terminal. Connect SGND
of the device to the analog ground plane using a via
close to SGND. Lay the analog ground plane on the
inner layer, preferably next to the top layer. Use the
analog ground plane to cover the entire area under
critical signal components for the power converter.
Have a power ground plane for the switching-
converter power circuit under the power compo-
nents (input filter capacitor, output filter capacitor,
inductor, MOSFET, rectifier diode, and current-
sense resistor). Connect PGND to the power ground
plane as close to PGND as possible. Connect all
other ground connections to the power ground
plane using vias close to the terminals.
17
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MAX16838AUP+T 功能描述:LED照明驱动器 HB w/High-Voltage DC/DC Controller 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
MAX16838EVKIT+ 功能描述:LED 照明开发工具 MAX16838 evaluation 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:
MAX16839ASA+ 功能描述:LED照明驱动器 High-Voltage Linear w/LED Open Detect 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
MAX16839ASA+T 功能描述:LED照明驱动器 High-Voltage Linear w/LED Open Detect 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
MAX16839ATT/V+ 制造商:Maxim Integrated Products 功能描述:
MAX16839ATT/V+T 功能描述:LED照明驱动器 High-Voltage Linear High-Brightness LED Driver with LED Fault Open Detect 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
MAX16839ATT+ 制造商:Maxim Integrated Products 功能描述:HIGH-VOLTAGE LINEAR HIGH-BRIGHTNES - Bulk
MAX16839ATT+T 功能描述:LED照明驱动器 High-Voltage Linear w/LED Open Detect 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