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參數(shù)資料
| 型號： | LM3407 |
| 廠商： | National Semiconductor Corporation |
| 英文描述： | 350 mA, Constant Current Output Floating Buck Switching Converter for High Power LEDs |
| 中文描述： | 350毫安，恒流輸出浮點高功率LED的降壓開關(guān)轉(zhuǎn)換器 |
| 文件頁數(shù)： | 12/16頁 |
| 文件大?。?/td> | 321K |
| 代理商： | LM3407 |
30046625
FIGURE 6. Relationship between I
OUT
, I
L(peak)
and I
L(ripple)
Table 1
provides the suggested inductance of the inductor for
500 kHz and 1 MHz switching frequency operation with
C
OUT
= 4.7μF and I
L(ripple)
= 0.8 x I
OUT
TABLE 1. Suggested Inductance Value of the Inductor
VIN / V
Number of LED
4
1
2
3
5
6
7
Inductor selection table for F
SW
= 500 kHz, C
OUT
= 4.7μF (1μF for 1 LED)
5
22 μH
10
22 μH
22 μH
15
22 μH
22 μH
20
22 μH
33 μH
25
22 μH
33 μH
30
22 μH
47 μH
Inductor selection table for F
SW
= 1 MHz, C
OUT
= 4.7μF (1μF for 1 LED)
5
22 μH
10
22 μH
22 μH
15
22 μH
22 μH
20
22 μH
22 μH
25
22 μH
33 μH
30
22 μH
33 μH
22 μH
22 μH
33 μH
33 μH
22 μH
22 μH
33 μH
22 μH
22 μH
33 μH
22 μH
22 μH
22 μH
22 μH
22 μH
22 μH
33 μH
22 μH
22 μH
33 μH
22 μH
22 μH
22 μH
22 μH
22 μH
22 μH
FREE-WHEELING DIODE
The LM3407 is a non-synchronous floating buck converter
that requires an external free-wheeling diode to provide a path
for recirculating current from the inductor to the LED array
when the power switch is turned OFF. Selecting the free-
wheeling diode depends on both the output voltage and cur-
rent. The diode must have a rated reverse voltage higher than
the input voltage of the converter and a peak current rating
higher than the expected maximum inductor current. Using a
schottky diode with a low forward voltage drop can reduce
power dissipation and enhance conversion efficiency.
www.national.com
12
L
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LM3407_09 | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:350 mA, Constant Current Output Floating Buck Switching Converter for High Power LEDs |
| LM3407_11 | 制造商:TI 制造商全稱:Texas Instruments 功能描述:LM3407 350 mA, Constant Current Output Floating Buck Switching Converter |
| LM3407EVAL | 功能描述:BOARD EVALUATION FOR LM3407 RoHS:否 類別:編程器，開發(fā)系統(tǒng) >> 評估板 - LED 驅(qū)動器 系列:PowerWise® 標(biāo)準(zhǔn)包裝:1 系列:PowerWise® 電流 - 輸出 / 通道:20mA 輸出及類型:1，非隔離 輸出電壓:17V 特點:可調(diào)光 輸入電壓:2.7 ~ 5.5 V 已供物品:板 已用 IC / 零件:LM3508 相關(guān)產(chǎn)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 |
| LM3407EVAL/NOPB | 功能描述:電源管理IC開發(fā)工具 LM3407 EVAL BOARD RoHS:否 制造商:Maxim Integrated 產(chǎn)品:Evaluation Kits 類型:Battery Management 工具用于評估:MAX17710GB 輸入電壓: 輸出電壓:1.8 V |
| LM3407MY | 制造商:Texas Instruments 功能描述:Conv DC-DC Single Step Down 4.5V to 30V 8-Pin MSOP EP T/R 制造商:Texas Instruments 功能描述:BUCK SW CONVERTER, 350MA, POWERWISE |
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