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| 型号： | LM2588T-3.3/NOPB |
| 厂商： | National Semiconductor |
| 文件页数： | 26/38页 |
| 文件大小： | 0K |
| 描述： | IC REG MULTI CONFIG 3.3V TO220-7 |
| 产品培训模块： | SIMPLE SWITCHER® Regulators |
| 标准包装： | 45 |
| 系列： | SIMPLE SWITCHER® |
| 类型： | 升压（升压），回扫，正向转换器 |
| 输出类型： | 固定 |
| 输出数： | 1 |
| 输出电压： | 3.3V |
| 输入电压： | 4 V ~ 40 V |
| PWM 型： | 电流模式 |
| 频率 - 开关： | 100kHz ~ 200kHz |
| 电流 - 输出： | 5A |
| 同步整流器： | 无 |
| 工作温度： | -40°C ~ 125°C |
| 安装类型： | 通孔 |
| 封装/外壳： | TO-220-7 成形引线 |
| 包装： | 管件 |
| 供应商设备封装： | TO-220-7 |
| 配用： | 551011367-051-ND - BOARD WEBENCH BUILD IT LM2586/88 |
| 其它名称： | *LM2588T-3.3 *LM2588T-3.3/NOPB LM2588T-3.3 |
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SNVS117D – APRIL 1998 – REVISED APRIL 2013
Figure 56. Waveforms of a Synchronized
12V Boost Regulator
The scope photo in Figure 56 shows a LM2588 12V Boost Regulator synchronized to a 200 kHz signal. There is
a 700 ns delay between the falling edge of the sync signal and the turning on of the switch.
PROGRAMMING OUTPUT VOLTAGE
(SELECTING R1 AND R2)
Referring to the adjustable regulator in Figure 57 , the output voltage is programmed by the resistors R1 and R2
by the following formula:
V OUT = V REF (1 + R1/R2)
where V REF = 1.23V
(1)
Resistors R1 and R2 divide the output voltage down so that it can be compared with the 1.23V internal
reference. With R2 between 1k and 5k, R1 is:
R1 = R2 (V OUT /V REF ? 1)
where V REF = 1.23V
(2)
For best temperature coefficient and stability with time, use 1% metal film resistors.
SHORT CIRCUIT CONDITION
Due to the inherent nature of boost regulators, when the output is shorted (see Figure 57 ), current flows directly
from the input, through the inductor and the diode, to the output, bypassing the switch. The current limit of the
switch does not limit the output current for the entire circuit. To protect the load and prevent damage to the
switch, the current must be externally limited, either by the input supply or at the output with an external current
limit circuit. The external limit should be set to the maximum switch current of the device, which is 5A.
In a flyback regulator application ( Figure 58 ), using the standard transformers, the LM2588 will survive a short
circuit to the main output. When the output voltage drops to 80% of its nominal value, the frequency will drop to
25 kHz. With a lower frequency, off times are larger. With the longer off times, the transformer can release all of
its stored energy before the switch turns back on. Hence, the switch turns on initially with zero current at its
collector. In this condition, the switch current limit will limit the peak current, saving the device.
26
Product Folder Links: LM2588
Copyright ? 1998–2013, Texas Instruments Incorporated
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相关代理商/技术参数 |
参数描述 |
|---|---|
| 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 |
| LM2588T-ADJ | 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-ADJ | 制造商:Texas Instruments 功能描述:SWITCHING REG 5A ADJ 2588 TO2207 |
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