參數(shù)資料
型號(hào)： LM3488
廠商： National Semiconductor Corporation
元件分類： 基準(zhǔn)電壓源/電流源
英文描述： 500kHz and 1MHz High Efficiency 1.5A Switching Regulators; Package: SO; No of Pins: 8; Temperature Range: -40?°C to 85?°C
中文描述： 射頻放大器
文件頁(yè)數(shù)： 14/24頁(yè)
文件大?。?/td> 626K
代理商： LM3488
Functional Description
(Continued)
TABLE 1.
(Continued)
T
OFF(SYNC)
(μsec)
4
5
6
7
8
9
10
R
SYNC
range (k
)
55 to 90
70 to 110
85 to 140
100 to 160
120 to 190
135 to 215
150 to 240
It is also necessary to have the width of the synchronization
pulse narrower than the duty cycle of the converter. It is also
necessary to have the synchronization pulse width
≥
300nsecs.
The FA/SYNC/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/SYNC/SD pin, the LM3488
stops switching and goes into a low current mode. The total
supply current of the IC reduces to less than 10μA under
these conditions.
Figure 8
and
Figure 9
show implementation of shutdown
function when operating in Frequency adjust mode and syn-
chronization mode respectively. In frequency adjust mode,
connecting the FA/SYNC/SD pin to ground forces the clock
to run at a certain frequency. Pulling this pin high shuts down
the IC. In frequency adjust or synchronization mode, a high
signal for more than 30ms shuts down the IC.
10138816
FIGURE 6. Frequency Adjust
10138815
FIGURE 7. Frequency Synchronization
10138816
FIGURE 8. Shutdown Operation in Frequency Adjust Mode
L
www.national.com
14
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