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| 型号： | LM3423BBLSCSEV/NOPB |
| 厂商： | National Semiconductor |
| 文件页数： | 38/67页 |
| 文件大小： | 0K |
| 描述： | BOARD EVAL BUCK BOOST LM3423 |
| 标准包装： | 1 |
| 系列： | PowerWise® |
| 电流 - 输出 / 通道： | 700mA |
| 输出及类型： | 1，非隔离 |
| 输入电压： | 10 ~ 70 V |
| 已供物品： | 板，文档 |
| 已用 IC / 零件： | LM3423 |
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SNVS574E – JULY 2008 – REVISED MAY 2013
Method #2: If PWM dimming is required, a three resistor network is suggested. To set V TURN-ON , assume R UV2 =
10 k ? and solve for R UV1 as in Method #1. To set V HYS , solve for R UVH :
R UVH =
R UV 1 x ( V HYS - 23 P A x R UV 2 )
23 P A x ( R UV 1 + R UV 2 )
(94)
13. PWM DIMMING METHOD
PWM dimming can be performed several ways:
Method #1: Connect the dimming MosFET (Q 3 ) with the drain to the nDIM pin and the source to AGND. Apply
an external PWM signal to the gate of Q DIM . A pull down resistor may be necessary to properly turn off Q 3 .
Method #2: Connect the anode of a Schottky diode to the nDIM pin. Apply an external inverted PWM signal to
the cathode of the same diode.
The DDRV pin should be connected to the gate of the dimFET with or without level-shifting circuitry as described
in the PWM DIMMING section. The dimFET should be rated to handle the average LED current and the nominal
output voltage.
14. ANALOG DIMMING METHOD
Analog dimming can be performed several ways:
Method #1: Place a potentiometer in series with the R CSH resistor to dim the LED current from the nominal I LED
to near zero.
Method #2: Connect a controlled current source as detailed in the ANALOG DIMMING section to the CSH pin.
Increasing the current sourced into the CSH node will decrease the LEDs from the nominal I LED to zero current in
the same manner as the thermal foldback circuit.
38
Copyright ? 2008–2013, Texas Instruments Incorporated
Product Folder Links: LM3421 LM3421-Q1 LM3423 LM3423-Q1
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LM3423BS2LYEV/NOPB | 功能描述:LED 照明开发工具 LM3423BS2LY EVAL BOARD 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: |
| LM3423MH | 制造商:Texas Instruments 功能描述:LED DRVR 3Segment 5V/9V/12V/15V/18V/24V 20-Pin TSSOP EP Rail 制造商:Texas Instruments 功能描述:LED DRIVER, HI V, 4.5~75V, POWERWISE |
| LM3423MH/NOPB | 功能描述:LED照明驱动器 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 |
| LM3423MHBKBSTEV | 制造商:Texas Instruments 功能描述:Development Kits And Tools, The Lm3421/23 Are Versatile High Voltage N-Channel Mosfet Controllers For LED Drivers Evaluation Board |
| LM3423MHBKBSTEV/NOPB | 功能描述:BOARD EVAL BUCK BOOST LM3423 RoHS:是 类别:编程器，开发系统 >> 评估板 - LED 驱动器 系列:PowerWise® 标准包装:1 系列:PowerWise® 电流 - 输出 / 通道:20mA 输出及类型:1，非隔离 输出电压:17V 特点:可调光 输入电压:2.7 ~ 5.5 V 已供物品:板 已用 IC / 零件:LM3508 相关产品:LM3508TLX-ND - IC LED DRVR WHT BCKLGT 9USMDLM3508TLDKR-ND - IC LED DRVR WHT BCKLGT 9MICROSMDLM3508TLCT-ND - IC LED DRVR WHT BCKLGT 9MICROSMDLM3508TLTR-ND - IC LED DRVR WHT BCKLGT 9MICROSMD |
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