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参数资料
| 型号： | LM5045MHX |
| 厂商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分类： | 稳压器 |
| 英文描述： | SWITCHING CONTROLLER, 540 kHz SWITCHING FREQ-MAX, PDSO28 |
| 封装： | ETSSOP-28 |
| 文件页数： | 16/28页 |
| 文件大小： | 610K |
| 代理商： | LM5045MHX |
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The UVLO and OVP can also be set together using a 3 re-
sistor divider ladder as shown in Figure 15. R
1 is calculated
as explained in the basic UVLO divider selection. Using the
same values, as in the above two examples, for the UVLO
and OVP set points, R
1 and R3 remain the same at 100k
and 1.5k
. The R
2 is 2.7k obtained by subtracting R3 from
4.2k
.
Remote configuration of the controller’s operational modes
can be accomplished with open drain device(s) connected to
the UVLO pin as shown in Figure 16.
Figure 17 shows an application of the OVP comparator for
Remote Thermal Protection using a thermistor (or multiple
thermistors) which may be located near the main heat
sources of the power converter. The negative temperature
coefficient (NTC) thermistor is nearly logarithmic, and in this
example a 100k
thermistor with the β material constant of
4500 Kelvin changes to approximately 2k
at 130C. Setting
R
1 to one-third of this resistance (665) establishes 130C as
the desired trip point (for VREF = 5V). In a temperature band
from 20C below to 20C above the OVP threshold, the volt-
age divider is nearly linear with 25mV per C sensitivity.
R
2 provides temperature hysteresis by raising the OVP com-
parator input by R
2 x 20A. For example, if a 22k resistor is
selected for R
2, then the OVP pin voltage will increase by 22k
x 20A = 506mV. The NTC temperature must therefore fall
by 506mV / 25mV per C = 20C before the LM5045 switches
from standby mode to the normal mode.
30145444
FIGURE 16. Remote Standby and Disable Control
30145414
FIGURE 17. Remote Thermal Protection
23
www.national.com
LM5045
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LM5045MHX/NOPB | 功能描述:电流型 PWM 控制器 RoHS:否 制造商:Texas Instruments 开关频率:27 KHz 上升时间: 下降时间: 工作电源电压:6 V to 15 V 工作电源电流:1.5 mA 输出端数量:1 最大工作温度:+ 105 C 安装风格:SMD/SMT 封装 / 箱体:TSSOP-14 |
| LM5045SQ | 制造商:TI 制造商全称:Texas Instruments 功能描述:Full-Bridge PWM Controller with Integrated MOSFET Drivers |
| LM5045SQ/NOPB | 功能描述:电流型 PWM 控制器 Full-Bridge PWM Cntrlr RoHS:否 制造商:Texas Instruments 开关频率:27 KHz 上升时间: 下降时间: 工作电源电压:6 V to 15 V 工作电源电流:1.5 mA 输出端数量:1 最大工作温度:+ 105 C 安装风格:SMD/SMT 封装 / 箱体:TSSOP-14 |
| LM5045SQX | 制造商:TI 制造商全称:Texas Instruments 功能描述:Full-Bridge PWM Controller with Integrated MOSFET Drivers |
| LM5045SQX/NOPB | 功能描述:IC PWM CTRLR FULL BRIDG 28LLP RoHS:是 类别:集成电路 (IC) >> PMIC - AC-DC 转换器，离线开关 系列:PowerWise® 标准包装:1 系列:FPS™ 输出隔离:隔离 频率范围:61kHz ~ 73kHz 输入电压:8 V ~ 26 V 输出电压:650V 功率（瓦特）:12W 工作温度:-40°C ~ 115°C 封装/外壳:8-DIP（0.300"，7.62mm） 供应商设备封装:8-MDIP 包装:Digi-Reel® 其它名称:FSL206MRBNFSDKR |
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