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參數資料
| 型號： | LM27402MHX |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | SWITCHING CONTROLLER, 1350 kHz SWITCHING FREQ-MAX, PDSO16 |
| 封裝： | 5 X 4.40 MM, 0.90 MM HEIGHT, 0.65 MM PITCH, ETSSOP-16 |
| 文件頁數： | 4/32頁 |
| 文件大?。?/td> | 653K |
| 代理商： | LM27402MHX |
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FIGURE 2. Current Limit Timing Diagram
In the example shown in Figure 2, the LM27402 immediately
turns off the high-side FET when an over-current pulse is de-
tected. After the third over-current event is detected, 24
switching cycles occur before the fourth over-current pulse is
detected. Since the current limit logic does not count 32
switching cycles between two over-current events, the inter-
nal current limit counter is not reset and continues counting
until the LM27402 enters hiccup mode. The soft-start capac-
itor is then discharged to initialize startup and a wait period of
1.28 ms occurs.
NEGATIVE CURRENT LIMIT
To prevent excess negative current, the LM27402 imple-
ments a negative current limit through the low-side FET.
Negative current limit is only enabled when an over-voltage
event is detected. Should an over-voltage fault occur, the low-
side FET will turn off if the SW pin voltage exceeds a positive
100mV during the low-side on time, thereby protecting the
powertrain from excessive negative current.
POWER GOOD
The PGOOD pin of the LM27402 is used to signal when the
output is out of regulation or during non-regulated pre-biased
conditions. This means that current limit, UVLO, over-voltage
threshold, under-voltage threshold, or a non regulated output
will cause the PGOOD pin to pull low. To prevent glitches to
PGOOD, a 20
μs de-glitch filter is built into the LM27402.
Figure 3 illustrates when the PGOOD flag is asserted low.
www.national.com
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LM27402
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相關代理商/技術參數 |
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|---|---|
| LM27402MHX/NOPB | 功能描述:DC/DC 開關控制器 High Perf Sync Buck Cntrlr RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開關頻率: 輸出電壓:1.215 V to 80 V 輸出電流:3.5 A 輸出端數量:1 最大工作溫度:+ 125 C 安裝風格: 封裝 / 箱體:CPAK |
| LM27402SQ | 制造商:Rochester Electronics LLC 功能描述: 制造商:Texas Instruments 功能描述: |
| LM27402SQ/NOPB | 功能描述:DC/DC 開關控制器 RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開關頻率: 輸出電壓:1.215 V to 80 V 輸出電流:3.5 A 輸出端數量:1 最大工作溫度:+ 125 C 安裝風格: 封裝 / 箱體:CPAK |
| LM27402SQEVAL/NOPB | 功能描述:電源管理IC開發(fā)工具 LM27402SQ EVAL BOARD RoHS:否 制造商:Maxim Integrated 產品:Evaluation Kits 類型:Battery Management 工具用于評估:MAX17710GB 輸入電壓: 輸出電壓:1.8 V |
| LM27402SQX | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:High Performance Synchronous Buck Controller with DCR Current Sensing |
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