參數(shù)資料
型號(hào)： LM3478MMX
廠商： NATIONAL SEMICONDUCTOR CORP
元件分類： 穩(wěn)壓器
英文描述： High Efficiency Low-Side N-Channel Controller for Switching Regulator
中文描述： 1 A SWITCHING CONTROLLER, 1000 kHz SWITCHING FREQ-MAX, PDSO8
封裝： MSOP-8
文件頁(yè)數(shù)： 12/21頁(yè)
文件大小： 624K
代理商： LM3478MMX
Functional Description
(Continued)
FREQUENCY ADJUST/SHUTDOWN
The switching frequency of LM3478 can be adjusted be-
tween 100kHz and 1MHz using a single external resistor.
This resistor must be connected between FA/SD pin and
ground, as shown in
Figure 6
. Please refer to the typical
performance characteristics to determine the value of the
resistor required for a desired switching frequency.
The FA/SD pin also functions as a shutdown pin. If a high
signal (refer to the electrical characteristics for definition of
high signal) appears on the FA/SD pin, the LM3478 stops
switching and goes into a low current mode. The total supply
current of the IC reduces to less than 10 μA under these
conditions.
Figure 7
shows implementation of shutdown function when
operating in frequency adjust mode. In frequency adjust
mode, connecting the FA/SD pin to ground forces the clock
to run at a certain frequency. Pulling this pin high shuts down
the IC. In frequency adjust mode, a high signal for more than
30μs shuts down the IC.
10135513
FIGURE 4. Increasing the Slope of the Compensation Ramp
10135551
FIGURE 5.
V
SL
vs R
SL
L
www.national.com
12
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
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LM3478MMX/S5000472 制造商:Texas Instruments 功能描述:
LM3478Q 制造商:NSC 制造商全稱:National Semiconductor 功能描述:High Efficiency Low-Side N-Channel Controller for Switching Regulator
LM3478QMM 制造商:NSC 制造商全稱:National Semiconductor 功能描述:High Efficiency Low-Side N-Channel Controller for Switching Regulator
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