參數(shù)資料
型號(hào)： LM27402SQX
廠(chǎng)商： NATIONAL SEMICONDUCTOR CORP
元件分類(lèi)： 穩(wěn)壓器
英文描述： SWITCHING CONTROLLER, 1350 kHz SWITCHING FREQ-MAX, QCC16
封裝： 4 X 4 MM, 0.80 MM HEIGHT, 0.65 MM PITCH, LLP-16
文件頁(yè)數(shù)： 4/32頁(yè)
文件大?。?/td> 653K
代理商： LM27402SQX
30092622
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
12
LM27402
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LM27402SQX/NOPB 功能描述:DC/DC 開(kāi)關(guān)控制器 RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開(kāi)關(guān)頻率: 輸出電壓:1.215 V to 80 V 輸出電流:3.5 A 輸出端數(shù)量:1 最大工作溫度:+ 125 C 安裝風(fēng)格: 封裝 / 箱體:CPAK
LM27403 制造商:TI 制造商全稱(chēng):Texas Instruments 功能描述:Synchronous Buck Controller with Temperature-Compensated, Inductor-DCR-Based Overcurrent Protection and Programmable Thermal Shutdown
LM27403EVM 制造商:Texas Instruments 功能描述:LM27403EVM - Boxed Product (Development Kits)
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