High-Power Synchronous HBLED
Drivers with Rapid Current Pulsing
Applications Information
Boost LED Driver
Figure 5 shows the MAX16821A/MAX16821B/MAX16821C
configured as a synchronous boost converter with
MODE connected to V CC . During the on-time, the input
voltage charges the inductor. During the off-time, the
V CC
inductor discharges to the output. The output voltage
cannot go below the input voltage in this configuration.
Resistor R1 senses the inductor current and resistor R2
senses the LED current. The outer LED current regula-
tion loop programs the average current in the inductor,
thus achieving tight LED current regulation.
V LED
R4
ON/OFF
R9
R10
R3
C3
V IN
7V TO 28V
C2
14
13
12
11
10
9
8
L1
C11
I.C.
OUTV
RT/SYNC
EN
MODE
CLKOUT
SGND
15 OVI
N.C. 7
C10
R8
Q2
V LED
C9
R7
16 CLP
17 EAOUT
DH 6
LX 5
C4
Q1
C8
R5
18 EAN
MAX16821A
MAX16821B
MAX16821C
BST 4
R5
C1
LED
STRING
19 DIFF
DL 3
R2
20 CSN
21 CSP
N.C. 2
PGND 1
D1
R1
SGND
22
SENSE-
23
SENSE+
24
SGND
25
IN
26
V CC
27
V DD
28
V IN
C7
C6
C5
Figure 5. Synchronous Boost LED Driver (Output Voltage Not to Exceed 28V)
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相关代理商/技术参数
MAX16821EVKIT+ 制造商:Maxim Integrated Products 功能描述:HIGH-POWER SYNCHRONOUS HBLED DRIVER - Boxed Product (Development Kits)
MAX16822AASA/V+ 功能描述:LED照明驱动器 2MHz HB w/MOSFET & HSide Crnt Sense 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
MAX16822AASA/V+T 功能描述:LED照明驱动器 2MHz HB w/MOSFET & HSide Crnt Sense 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
MAX16822AASA+ 功能描述:LED照明驱动器 2MHz HB w/MOSFET & HSide Crnt Sense 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
MAX16822AASA+T 功能描述:LED照明驱动器 2MHz HB w/MOSFET & HSide Crnt Sense 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
MAX16822BASA+ 功能描述:LED照明驱动器 2MHz HB w/MOSFET & HSide Crnt Sense 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
MAX16822BASA+T 功能描述:LED照明驱动器 2MHz HB w/MOSFET & HSide Crnt Sense 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
MAX16822BEVKIT+ 功能描述:LED 照明开发工具 MAX16822B 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: