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參數資料
| 型號： | LM2586 |
| 廠商： | National Semiconductor Corporation |
| 英文描述： | Octal D-type Edge-Triggered Flip-Flops With 3-State Outputs 20-PDIP -40 to 85 |
| 中文描述： | 第3A激的SIMPLE SWITCHER穩(wěn)壓器，帶有關斷 |
| 文件頁數： | 21/28頁 |
| 文件大?。?/td> | 778K |
| 代理商： | LM2586 |
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Typical Boost Regulator Applications
(Continued)
Note 24:
The LM2586 will require a heat sink in these applications. The size of the heat sink will depend on the maximum ambient temperature. To calculate the
thermal resistance of the IC and the size of the heat sink needed, see the “Heat Sink/Thermal Considerations” section in the Application Hints.
Application Hints
LM2586 SPECIAL FEATURES
SHUTDOWN CONTROL
A feature of the LM2586 is its ability to be shut down using
the ON /OFF pin (pin 1). This feature conserves input power
by turning off the device when it is not in use. For proper op-
eration, an isolation diode is required (as shown in Figure
38).
The device will shut down when 3V or greater is applied on
the ON /OFF pin, sourcing current into pin 1. In shut down
mode, the device will draw typically 56 μA of supply current
(16 μA to V
and 40 μA to the ON /OFF pin). To turn the de-
vice back on, leave pin 1 floating, using an (isolation) diode,
as shown in Figure 38 (for normal operation, do not source
or sink current to or from this pin— see the next section).
FREQUENCY ADJUSTMENT
The switching frequency of the LM2586 can be adjusted with
the use of an external resistor. This feature allows the user to
optimize the size of the magnetics and the output capaci-
tor(s) by tailoring the operating frequency. A resistor con-
nected from pin 1 (the Freq. Adj. pin) to ground will set the
switching frequency from 100 kHz to 200 kHz (maximum).
As shown in Figure 38 the pin can be used to adjust the fre-
quency while still providing the shut down function.Acurve in
the Performance Characteristics Section graphs the resistor
value to the corresponding switching frequency. The table in
Figure 39 shows resistor values corresponding to commonly
used frequencies.
However, changing the LM2586’s operating frequency from
its nominal value of 100 kHz will change the magnetics se-
lection and compensation component values.
DS012516-57
FIGURE 37. +24V to +48V Boost Regulator
DS012516-58
FIGURE 38. Shutdown Operation
R
SET
(k
)
Open
200
47
33
22
Frequency (kHz)
100
125
150
175
200
FIGURE 39. Frequency Setting Resistor Guide
www.national.com
21
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相關代理商/技術參數 |
參數描述 |
|---|---|
| LM2586S-12 | 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 輸出端數量:2 最大工作溫度:+ 85 C 安裝風格:SMD/SMT |
| LM2586S-12/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 輸出端數量:2 最大工作溫度:+ 85 C 安裝風格:SMD/SMT |
| LM2586S-3.3 | 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 輸出端數量:2 最大工作溫度:+ 85 C 安裝風格:SMD/SMT |
| LM2586S-3.3/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 輸出端數量:2 最大工作溫度:+ 85 C 安裝風格:SMD/SMT |
| LM2586S-5.0 | 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 輸出端數量:2 最大工作溫度:+ 85 C 安裝風格:SMD/SMT |
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