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Offline and DC-DC PWM Controllers for
High-Brightness LED Drivers
Application Circuits
Figure 5 shows an offline application of an HB LED dri-
ver using the MAX16801. The use of transformer T1
allows significant design flexibility. Use the internal
error amplifier for a very accurate LED current control.
Figure 6 shows a discontinuous flyback LED driver with
linear dimming capability. The total LED voltage can be
lower or higher than the input voltage.
Figure 7 shows a continuous-conduction-mode HB LED
buck driver with linear dimming and just a few external
components.
Figure 8 shows an offline isolated flyback HB LED dri-
ver with low-frequency PWM using MAX16801. The
PWM signal needs to be inverted (see the Functional
Diagram ). Transformer T1 provides full safety isolation
and operation from universal AC line (85VAC to
265VAC).
D1
T1
V SUPPLY
D2
V OUT
R1
R2
C4
IN
NDRV
Q1
LEDs
C1
V CC
CS
C2
C3
MAX16801
R4
R7
COMP
GND
R6
DIM/FB
UVLO/EN
R3
R5
GND
Figure 5. Offline, Nonisolated, Flyback LED Driver with Programmable Input-Supply Start Voltage
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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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MAX16803ATE+ 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 制造商:Maxim Integrated Products 功能描述:HIGH-VOLTAGE, 350MA, HIGH-BRIGHTNES - Bulk
MAX16803EVKIT+ 功能描述:LED 照明开发工具 MAX16803 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:
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