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参数资料
| 型号： | LM2585-5.0MDC |
| 厂商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分类： | 稳压器 |
| 英文描述： | 7 A SWITCHING REGULATOR, 125 kHz SWITCHING FREQ-MAX, UUC |
| 封装： | DIE |
| 文件页数： | 9/29页 |
| 文件大小： | 708K |
| 代理商： | LM2585-5.0MDC |
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Step-Up (Boost) Regulator Operation
Figure 30 shows the LM2585 used as a step-up (boost)
regulator. This is a switching regulator that produces an
output voltage greater than the input supply voltage.
A brief explanation of how the LM2585 Boost Regulator
works is as follows (refer to
Figure 30). When the NPN
switch turns on, the inductor current ramps up at the rate of
V
IN/L, storing energy in the inductor. When the switch turns
off, the lower end of the inductor flies above V
IN, discharging
its current through diode (D) into the output capacitor (C
OUT)
at a rate of (V
OUT VIN)/L. Thus, energy stored in the
inductor during the switch on time is transferred to the output
during the switch off time. The output voltage is controlled by
adjusting the peak switch current, as described in the flyback
regulator section.
DS012515-48
By adding a small number of external components (as shown in
Figure 30), the LM2585 can be used to produce a regulated output voltage that is greater than
the applied input voltage. The switching waveforms observed during the operation of this circuit are shown in
Figure 31. Typical performance of this regulator is
shown in
Figure 32.
FIGURE 30. 12V Boost Regulator
DS012515-49
A: Switch Voltage, 10 V/div
B: Switch Current, 2 A/div
C: Inductor Current, 2 A/div
D: Output Ripple Voltage,
100 mV/div, AC-Coupled
Horizontal: 2 s/div
FIGURE 31. Switching Waveforms
DS012515-50
FIGURE 32. V
OUT Response to Load Current Step
LM2585
www.national.com
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PDF描述 |
|---|---|
| LM2585-5.0MWC | 7 A SWITCHING REGULATOR, 125 kHz SWITCHING FREQ-MAX, UUC |
| LM2585-12MDC | 7 A SWITCHING REGULATOR, 125 kHz SWITCHING FREQ-MAX, UUC |
| LM2585-12MWC | 7 A SWITCHING REGULATOR, 125 kHz SWITCHING FREQ-MAX, UUC |
| LM2631MTC-ADJ/NOPB | SWITCHING CONTROLLER, 345 kHz SWITCHING FREQ-MAX, PDSO20 |
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LM2585S-12 | 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 |
| LM2585S-12/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 |
| LM2585S-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 |
| LM2585S-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 |
| LM2585S-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 |
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