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参数资料
| 型号： | LM2588T-12/NOPB |
| 厂商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分类： | 稳压器 |
| 英文描述： | 9.5 A SWITCHING REGULATOR, 200 kHz SWITCHING FREQ-MAX, PSFM7 |
| 封装： | LEAD FREE, BENT STAGGERED, TO-220, 7 PIN |
| 文件页数： | 17/30页 |
| 文件大小： | 1280K |
| 代理商： | LM2588T-12/NOPB |
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Typical Boost Regulator Applications (Continued)
Application Hints
LM2588 SPECIAL FEATURES
SHUTDOWN CONTROL
A feature of the LM2588 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
operation, an isolation diode is required (as shown in Figure
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 A of supply current
(16 A to V
IN and 40 A to the ON /OFF pin). To turn the
device back on, leave pin 1 floating, using an (isolation)
diode, as shown in Figure 41 (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 LM2588 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 41, the pin can be used to adjust the
frequency while still providing the shut down function. A
curve in the Performance Characteristics Section graphs the
resistor value to the corresponding switching frequency. The
table in Figure 42 shows resistor values corresponding to
commonly used frequencies.
However, changing the LM2588’s operating frequency from
its nominal value of 100 kHz will change the magnetics
selection and compensation component values.
01242053
*The LM2588 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.
FIGURE 40. +24V to +48V Boost Regulator
01242054
FIGURE 41. Shutdown Operation
R
SET(k
)
Frequency (kHz)
Open
100
200
125
47
150
33
175
22
200
FIGURE 42. Frequency Setting Resistor Guide
01242055
FIGURE 43. Frequency Synchronization
LM2588
www.national.com
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LM2588T-3.3 | 功能描述:直流/直流开关转换器 RoHS:否 制造商:STMicroelectronics 最大输入电压:4.5 V 开关频率:1.5 MHz 输出电压:4.6 V 输出电流:250 mA 输出端数量:2 最大工作温度:+ 85 C 安装风格:SMD/SMT |
| LM2588T-3.3/NOPB | 功能描述:直流/直流开关转换器 RoHS:否 制造商:STMicroelectronics 最大输入电压:4.5 V 开关频率:1.5 MHz 输出电压:4.6 V 输出电流:250 mA 输出端数量:2 最大工作温度:+ 85 C 安装风格:SMD/SMT |
| LM2588T-5.0 | 功能描述:直流/直流开关转换器 RoHS:否 制造商:STMicroelectronics 最大输入电压:4.5 V 开关频率:1.5 MHz 输出电压:4.6 V 输出电流:250 mA 输出端数量:2 最大工作温度:+ 85 C 安装风格:SMD/SMT |
| LM2588T-5.0/NOPB | 功能描述:直流/直流开关转换器 RoHS:否 制造商:STMicroelectronics 最大输入电压:4.5 V 开关频率:1.5 MHz 输出电压:4.6 V 输出电流:250 mA 输出端数量:2 最大工作温度:+ 85 C 安装风格:SMD/SMT |
| LM2588T50 | 制造商:Texas Instruments 功能描述:SWITCHING REG 5A 5.0V 2588 TO-220 |
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