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參數(shù)資料
| 型號： | LM3102MH |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | SIMPLE SWITCHER㈢ Synchronous 1MHz 2.5A Step-Down Voltage Regulator |
| 中文描述： | SWITCHING REGULATOR, 1000 kHz SWITCHING FREQ-MAX, PDSO20 |
| 封裝： | PLASTIC, TSSOP-20 |
| 文件頁數(shù)： | 11/18頁 |
| 文件大?。?/td> | 330K |
| 代理商： | LM3102MH |
(5)
The LM3102 can be remotely shutdown by pulling the voltage
of the EN pin below 1V. In this shutdown mode, the SS pin is
internally grounded, the on-timer is disabled, and bias cur-
rents are reduced. Releasing the EN pin allows normal oper-
ation to resume because the EN pin is internally pulled up.
30021325
FIGURE 1. Shutdown Implementation
Current Limit
Current limit detection is carried out during the off-time by
monitoring the re-circulating current through the synchronous
MOSFET. Referring to the Functional Block Diagram, when
the main MOSFET is turned off, the inductor current flows
through the load, the PGND pin and the internal synchronous
MOSFET. If this current exceeds 2.7A, the current limit com-
parator toggles, and as a result disabling the start of the next
on-time period. The next switching cycle starts when the re-
circulating current falls back below 2.7A (and the voltage at
the FB pin is below 0.8V). The inductor current is monitored
during the on-time of the synchronous MOSFET. As long as
the inductor current exceeds 2.7A, the main MOSFET will re-
main inhibited to achieve current limit. The operating frequen-
cy is lower during current limit due to a longer off-time.
Figure 2 illustrates an inductor current waveform. On aver-
age, the output current I
is the same as the inductor
current I
, which is the average of the rippled inductor current.
In case of current limit (the current limit portion of Figure 2),
the next on-time will not initiate until that the current drops
below 2.7A (assume the voltage at the FB pin is lower than
0.8V). During each on-time the current ramps up an amount
equal to:
(6)
During current limit, the LM3102 operates in a constant cur-
rent mode with an average output current I
OUT(CL)
equal to
2.7A + I
LR
/ 2.
30021326
FIGURE 2. Inductor Current - Current Limit Operation
11
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相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| LM3102MH/NOPB | 功能描述:直流/直流開關調節(jié)器 SYNC 1MHZ 2.5A STEP- DOWN VLTG REG RoHS:否 制造商:International Rectifier 最大輸入電壓:21 V 開關頻率: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: 安裝風格:SMD/SMT 封裝 / 箱體:PQFN 4 x 5 |
| LM3102MHX | 制造商:Texas Instruments 功能描述:Conv DC-DC Single Step Down 4.5V to 42V 20-Pin TSSOP EP T/R |
| LM3102MHX/NOPB | 功能描述:直流/直流開關轉換器 RoHS:否 制造商:STMicroelectronics 最大輸入電壓:4.5 V 開關頻率: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 安裝風格:SMD/SMT |
| LM3102QMH/NOPB | 功能描述:直流/直流開關調節(jié)器 SIMPLE SWITCHER Sync 1MHz 2.5A SD Vtg Reg RoHS:否 制造商:International Rectifier 最大輸入電壓:21 V 開關頻率: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: 安裝風格:SMD/SMT 封裝 / 箱體:PQFN 4 x 5 |
| LM3102QMHX/NOPB | 功能描述:直流/直流開關調節(jié)器 SIMPLE SWITCHER Sync 1MHz 2.5A SD Vtg Reg RoHS:否 制造商:International Rectifier 最大輸入電壓:21 V 開關頻率: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: 安裝風格:SMD/SMT 封裝 / 箱體:PQFN 4 x 5 |
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