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参数资料
| 型号： | LM2592HV3.3MWC |
| 厂商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分类： | 稳压器 |
| 英文描述： | 4 A SWITCHING REGULATOR, 173 kHz SWITCHING FREQ-MAX, UUC |
| 封装： | WAFER |
| 文件页数： | 7/24页 |
| 文件大小： | 720K |
| 代理商： | LM2592HV3.3MWC |
Application Information (Continued)
UNDERVOLTAGE LOCKOUT
Some applications require the regulator to remain off until
the input voltage reaches a predetermined voltage. An und-
ervoltage lockout feature applied to a buck regulator is
shown in
same feature to an inverting circuit. The circuit in
features a constant threshold voltage for turn on and turn off
(zener voltage plus approximately one volt). If hysteresis is
needed, the circuit in
Figure 10 has a turn ON voltage which
is different than the turn OFF voltage. The amount of hyster-
esis is approximately equal to the value of the output volt-
age. If zener voltages greater than 25V are used, an addi-
tional 47 k
resistor is needed from the ON /OFF pin to the
ground pin to stay within the 25V maximum limit of the ON
/OFF pin.
lNVERTING REGULATOR
The circuit in
Figure 11 converts a positive input voltage to a
negative output voltage with a common ground. The circuit
operates by bootstrapping the regulator’s ground pin to the
negative output voltage, then grounding the feedback pin,
the regulator senses the inverted output voltage and regu-
lates it.
This example uses the LM2592HV-5.0 to generate a 5V
output, but other output voltages are possible by selecting
other output voltage versions, including the adjustable ver-
10129436
FIGURE 7. Delayed Startup
10129437
FIGURE 8. Undervoltage Lockout for Buck Regulator
10129484
This circuit has an ON/OFF threshold of approximately 13V.
FIGURE 9. Undervoltage Lockout for Inverting Regulator
LM2592HV
www.national.com
15
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LM2592HVS-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 |
| LM2592HVS-3.3/NOPB | 功能描述:直流/直流开关转换器 PWR CONVERTER 150KHz 2A ST-DOWN VLTG REG 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 |
| LM2592HVS-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 |
| LM2592HVS-5.0/NOPB | 功能描述:直流/直流开关转换器 PWR CONVERTER 150KHz 2A ST-DOWN VLTG REG 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 |
| LM2592HVS-5.0/NOPB | 制造商:Texas Instruments 功能描述:DC/DC Converter (DC-DC) / Switching Regu |
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