- 您现在的位置：买卖IC网 > PDF目录80195 > LM2577S-15X (NATIONAL SEMICONDUCTOR CORP) 6 A SWITCHING REGULATOR, 62 kHz SWITCHING FREQ-MAX, PSSO5 PDF资料下载
参数资料
| 型号： | LM2577S-15X |
| 厂商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分类： | 稳压器 |
| 英文描述： | 6 A SWITCHING REGULATOR, 62 kHz SWITCHING FREQ-MAX, PSSO5 |
| 封装： | PLASTIC, TO-263, SMT-5 |
| 文件页数： | 16/31页 |
| 文件大小： | 1406K |
| 代理商： | LM2577S-15X |
第1页第2页第3页第4页第5页第6页第7页第8页第9页第10页第11页第12页第13页第14页第15页当前第16页第17页第18页第19页第20页第21页第22页第23页第24页第25页第26页第27页第28页第29页第30页第31页
Application Hints (Continued)
C. Calculate the minimum value of C
C
D. Calculate the maximum ESR of the +V
OUT and VOUT
output capacitors in parallel.
This formula can also be used to calculate the maximum
ESR of a single output regulator.
At this point, refer to this same section in the Step-Up
Regulator Design Procedurefor more information regard-
ing the selection of C
OUT.
3. Output Voltage Selection
This section is for applications using the LM1577-ADJ/
LM2577-ADJ. Skip this section if the LM1577-12/LM2577-12
or LM1577-15/LM2577-15 is being used.
With the LM1577-ADJ/LM2577-ADJ, the output voltage is
given by
V
OUT = 1.23V (1 + R1/R2)
Resistors R1 and R2 divide the output voltage down so it can
be compared with the LM1577-ADJ/LM2577-ADJ internal
1.23V reference. For a desired output voltage V
OUT, select
R1 and R2 so that
4. Diode Selection
The switching diode in a flyback converter must withstand
the reverse voltage specified by the following equation.
A suitable diode must have a reverse voltage rating greater
than this. In addition it must be rated for more than the
average and peak diode currents listed in Figure 19.
5. Input Capacitor Selection
The primary of a flyback transformer draws discontinuous
pulses of current from the input supply. As a result, a flyback
regulator generates more noise at the input supply than a
Duty Cycle
D
Primary Current Variation
I
P
Peak Primary Current
I
P(PK)
Switch Voltage when Off
V
SW(OFF)
Diode Reverse Voltage
V
R
V
OUT
+ N(V
IN
V
SAT)
Average Diode Current
I
D(AVE)
I
LOAD
Peak Diode Current
I
D(PK)
Short Circuit Diode Current
Power Dissipation of
LM1577/LM2577
P
D
01146878
FIGURE 19. Flyback Regulator Formulas
LM1577/LM2577
www.national.com
23
相关PDF资料 |
PDF描述 |
|---|---|
| LK4003-9RD1TB1 | 1-OUTPUT AC-DC PWR FACTOR CORR MODULE |
| LS2320-7ERD2TB1 | 2-OUTPUT 100 W AC-DC REG PWR SUPPLY MODULE |
| LWD-15-1224 | 2-OUTPUT 14.4 W AC-DC REG PWR SUPPLY MODULE |
| LWT-50H-5FF | 3-OUTPUT 50 W AC-DC REG PWR SUPPLY MODULE |
| LM1501-7RV2A | 1-OUTPUT 50 W AC-DC REG PWR SUPPLY MODULE |
相关代理商/技术参数 |
参数描述 |
|---|---|
| LM2577S-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 |
| LM2577S-ADJ/NOPB | 功能描述:直流/直流开关转换器 STEP-UP 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 |
| LM2577S-ADJ/NOPB | 制造商:Texas Instruments 功能描述:DC/DC Converter (DC-DC) / Switching Regu |
| LM2577SX-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 |
| LM2577SX-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 |
发布紧急采购，3分钟左右您将得到回复。