Offline and DC-DC PWM Controllers for
High-Brightness LED Drivers
OPTIONAL ONLY WHEN PWM DIMMING IS USED
D3
C4
D1
R2
T1
D2
R1
V CC
NDRV
Q1
LEDs
UNIVERSAL
AC INPUT
BRIDGE
RECTIFIER
C3
IN
GND
C6
MAX16801B
CS
C1
C2
*PWM
DIM/FB
UVLO/EN
R3
R4
C5
* WARNING: PWM DIMMING SIGNAL IS SHOWN AT THE PRIMARY SIDE.
USE AN OPTOCOUPLER FOR SAFETY ISOLATION OF THE PWM SIGNAL.
Figure 8. Universal AC Input, Offline, Isolated Flyback HB LED Driver with Low-Frequency PWM Dimming
D1
T1
+V IN
D3
V OUT
U2
R1
R2
OPTO LED
IN
NDRV
Q1
R8
C1
V CC
CS
R4
C4
R11
C3
U2
OPTO TRANS
R7
COMP
MAX16801
GND
R9
Z1
U3
TLV431
R5
R6
DIM/FB
UVLO/EN
R3
GND
C2
C5
R10
Figure 9. Universal Input, Offline, High-Accuracy Current Regulation in an Isolated Flyback HB LED Driver
______________________________________________________________________________________
13
相关PDF资料
MAX16803EVKIT+ EVAL KIT FOR MAX16803
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相关代理商/技术参数
MAX16803ATE/V+ 功能描述:LED照明驱动器 350mA HB LED Drvr w/PWM Dim and 5V Reg 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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MAX16803EVKIT+BJT 功能描述:LED 照明开发工具 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:
MAX16804ATP+ 功能描述:LED照明驱动器 350mA HB LED Drvr w/analog & PWM Dim 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