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| 型号： | LM2588T-3.3/NOPB |
| 厂商： | National Semiconductor |
| 文件页数： | 25/38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
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 μ A of supply current (16 μ A to V IN and 40 μ A to the ON /OFF pin).
To turn the device back on, leave pin 1 floating, using an (isolation) diode, as shown in Figure 54 (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 capacitor(s) by tailoring the operating frequency. A
resistor connected 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 54 , 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 Table 4 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.
Table 4. Frequency Setting Resistor Guide
R SET (k Ω )
Open
200
47
33
22
Frequency (kHz)
100
125
150
175
200
Figure 55. Frequency Synchronization
FREQUENCY SYNCHRONIZATION
Another feature of the LM2588 is the ability to synchronize the switching frequency to an external source, using
the sync pin (pin 6). This feature allows the user to parallel multiple devices to deliver more output power.
A negative falling pulse applied to the sync pin will synchronize the LM2588 to an external oscillator (see
Use of this feature enables the LM2588 to be synchronized to an external oscillator, such as a system clock. This
operation allows multiple power supplies to operate at the same frequency, thus eliminating frequency-related
noise problems.
Copyright ? 1998–2013, Texas Instruments Incorporated
Product Folder Links: LM2588
25
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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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