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參數(shù)資料
| 型號： | LM25005MH |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 42V, 2.5A STEP-DOWN SWITCHING REGULATOR |
| 中文描述： | 4.25 A SWITCHING REGULATOR, 525 kHz SWITCHING FREQ-MAX, PDSO20 |
| 封裝： | TSSOP-20 |
| 文件頁數(shù)： | 18/21頁 |
| 文件大?。?/td> | 756K |
| 代理商： | LM25005MH |
Application Information
(Continued)
BIAS POWER DISSIPATION REDUCTION
Buck regulators operating with high input voltage can dissi-
pate an appreciable amount of power for the bias of the IC.
The V
regulator must step-down the input voltage V
to a
nominal V
level of 7V. The large voltage drop across the
V
CC
regulator translates into a large power dissipation within
the Vcc regulator. There are several techniques that can
significantly reduce this bias regulator power dissipation.
Figures 11 and 12 depict two methods to bias the IC from the
output voltage. In each case the internal Vcc regulator is
used to initially bias the VCC pin. After the output voltage is
established, the VCC pin potential is raised above the nomi-
nal 7V regulation level, which effectively disables the internal
V
regulator. The voltage applied to the VCC pin should
never exceed 14V. The V
CC
voltage should never be larger
than the V
IN
voltage.
20170018
FIGURE 11. VCC Bias from VOUT for 8V
<
VOUT
<
14V
20170019
FIGURE 12. VCC Bias with Additional Winding on the Output Inductor
L
www.national.com
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相關(guān)PDF資料 |
PDF描述 |
|---|---|
| LM25005MHX | 42V, 2.5A STEP-DOWN SWITCHING REGULATOR |
| LM25007 | 42V, 0.5A Step-Down Switching Regulator |
| LM25007MM | 42V, 0.5A Step-Down Switching Regulator |
| LM25007MMX | 42V, 0.5A Step-Down Switching Regulator |
| LM25007SD | 42V, 0.5A Step-Down Switching Regulator |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LM25005MH/NOPB | 功能描述:直流/直流開關(guān)調(diào)節(jié)器 42V,2.5A STEP-DOWN SWITCHING REG RoHS:否 制造商:International Rectifier 最大輸入電壓:21 V 開關(guān)頻率:1.5 MHz 輸出電壓:0.5 V to 0.86 V 輸出電流:4 A 輸出端數(shù)量: 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:PQFN 4 x 5 |
| LM25005MHX | 功能描述:直流/直流開關(guān)轉(zhuǎn)換器 RoHS:否 制造商:STMicroelectronics 最大輸入電壓:4.5 V 開關(guān)頻率:1.5 MHz 輸出電壓:4.6 V 輸出電流:250 mA 輸出端數(shù)量:2 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT |
| LM25005MHX/NOPB | 功能描述:直流/直流開關(guān)轉(zhuǎn)換器 RoHS:否 制造商:STMicroelectronics 最大輸入電壓:4.5 V 開關(guān)頻率:1.5 MHz 輸出電壓:4.6 V 輸出電流:250 mA 輸出端數(shù)量:2 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT |
| LM25007 | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:Boot Capacitor Regulation in LM25007 Constant-On-Time (COT) Converter |
| LM25007_08 | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:42V, 0.5A Step-Down Switching Regulator |
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