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参数资料
| 型号： | LM3423BBLSCSEV/NOPB |
| 厂商： | National Semiconductor |
| 文件页数： | 23/67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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LM3421/23
100
k :
10V
R SNS
SNVS574E – JULY 2008 – REVISED MAY 2013
Q2
100 nF
DDRV
Figure 31. Buck Level-Shifted PWM Circuit
V O
LM3421/23
R SNS
DPOL
10V
100
k :
Q2
V CC
Q6
100 pF
10 k :
DDRV
Figure 32. Boost Level-Shifted PWM Circuit
LM3423 ONLY: DPOL, FLT, TIMR, and LRDY
The LM3423 has four additional pins: DPOL, FLT, TIMR, and LRDY. The DPOL pin is simply used to invert the
DDRV polarity . If DPOL is left open, then it is internally pulled high and the polarity is correct for driving a series
N-channel dimFET. If DPOL is pulled low then the polarity is correct for using a series P-channel dimFET in high-
side dimming applications. For a parallel P-channel dimFET, as used in the buck topology, leave DPOL open for
proper polarity.
Among the LM3423's other additional pins are TIMR and FLT which can be used in conjunction with an input
disconnect MosFET switch as shown in Figure 33 to protect the module from various fault conditions.
A fault is detected and an 11.5 μA (typical) current is sourced from the TIMR pin whenever any of the following
conditions exist:
1. LED current is above regulation by more than 30%.
2. OVLO has engaged.
3. Thermal shutdown has engaged.
An external capacitor (C TMR ) from TIMR to AGND programs the fault filter time as follows:
C TMR =
t FLT x 11.5 P A
1.24 V
(33)
When the voltage on the TIMR pin reaches 1.24V, the device is latched off and the N-channel MosFET open
drain FLT pin transitions to a high impedance state. The TIMR pin will be immediately pulled to ground (reset) if
the fault condition is removed at any point during the filter period. Otherwise, if the timer expires, the fault will
remain latched until one of three things occurs:
Copyright ? 2008–2013, Texas Instruments Incorporated
23
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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