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參數(shù)資料
| 型號(hào)： | L6928D |
| 廠商： | STMICROELECTRONICS |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 1.65 A SWITCHING REGULATOR, 1400 kHz SWITCHING FREQ-MAX, PDSO8 |
| 封裝： | 3 MM, LEAD FREE, MSOP-8 |
| 文件頁(yè)數(shù)： | 16/16頁(yè) |
| 文件大?。?/td> | 268K |
| 代理商： | L6928D |
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L6928
Operation description
9/16
4.2
Short circuit protection
During the device operation, the inductor current increases during the high side turn ON
phase and decrease during the high side turn off phase based on the following equations:
Equation 1
Equation 2
In strong overcurrent or shortcircuit conditions the VOUT can be very close to zero. In this
case
I
ON increases and IOFF decreases. When the inductor peak current reaches the
current limit, the high side mosfet turns off and so the TON is reduced down to the minimum
value (250ns typ.) in order to reduce as much as possible
I
ON.
Anyway, if VOUT is low enough it can be that the inductor peak current further increases
because during the TOFF the current decays very slowly.
Due to this reason a second protection that fixes the maximum inductor valley current has
been introduced. This protection doesn't allow the high side MOSFET to turn on if the
current flowing through the inductor is higher that a specified threshold (valley current limit).
Basically the TOFF is increased as much as required to bring the inductor current down to
this threshold.
So, the maximum peak current in worst case conditions will be:
Equation 3
Where IPEAK is the valley current limit (1.4A typ.) and TON_MIN is the minimum TON of the
high side MOSFET.
I
ON
V
IN
V
OUT
–
()
L
---------------------------------- T
ON
=
I
OFF
V
OUT
()
L
------------------- T
OFF
=
I
PEAK
I
VALLEY
V
IN
L
--------- T
ON_MIN
+
=
相關(guān)PDF資料 |
PDF描述 |
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| L6928TR | 1.65 A SWITCHING REGULATOR, 1400 kHz SWITCHING FREQ-MAX, PDSO8 |
| L6995D | SWITCHING CONTROLLER, 270 kHz SWITCHING FREQ-MAX, PDSO20 |
| L6995STR | SWITCHING CONTROLLER, PDSO20 |
| L6997D | SWITCHING CONTROLLER, PDSO20 |
| L6997DTR | SWITCHING CONTROLLER, PDSO20 |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| L6928D013TR | 功能描述:直流/直流開關(guān)調(diào)節(jié)器 2.0 to 5.5V Step-Dwn 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 |
| L6928Q1 | 功能描述:直流/直流開關(guān)調(diào)節(jié)器 Hi EFFICIENCY MONOLITHIC SYNC 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 |
| L6928Q1TR | 功能描述:直流/直流開關(guān)調(diào)節(jié)器 HIGH EFFICIENCY MONO LITHIC SYNCHRONOUS 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 |
| L6928TQ1TR | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:High efficiency monolithic synchronous step down regulator |
| L6928TR | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:High efficiency monolithic synchronous step down regulator |
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