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参数资料
| 型号： | LM2577NADJ |
| 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, PDIP24 |
| 封装： | 0.300 INCH, PLASTIC, DIP-16 |
| 文件页数： | 17/31页 |
| 文件大小： | 1406K |
| 代理商： | LM2577NADJ |
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Application Hints (Continued)
step-up regulator, and this requires a larger bypass capacitor
to decouple the LM1577/LM2577 V
IN pin from this noise. For
most applications, a low ESR, 1.0 F cap will be sufficient, if
it is connected very close to the V
IN and Ground pins.
Transformer
Input
Dual
Maximum
Type
Voltage
Output
Voltage
Current
L
P = 100 H
5V
±10V
325 mA
1
N=1
5V
±12V
275 mA
5V
±15V
225 mA
10V
±10V
700 mA
10V
±12V
575 mA
2L
P = 200 H
10V
±15V
500 mA
N = 0.5
12V
±10V
800 mA
12V
±12V
700 mA
12V
±15V
575 mA
3L
P = 250 H
15V
±10V
900 mA
N = 0.5
15V
±12V
825 mA
15V
±15V
700 mA
In addition to this bypass cap, a larger capacitor (
≥ 47 F)
should be used where the flyback transformer connects to
the input supply. This will attenuate noise which may inter-
fere with other circuits connected to the same input supply
voltage.
6. Snubber Circuit
A “snubber” circuit is required when operating from input
voltages greater than 10V, or when using a transformer with
L
P
≥ 200 H. This circuit clamps a voltage spike from the
transformer primary that occurs immediately after the output
switch turns off. Without it, the switch voltage may exceed
the 65V maximum rating. As shown in Figure 21, the snub-
ber consists of a fast recovery diode, and a parallel RC. The
RC values are selected for switch clamp voltage (V
CLAMP)
that is 5V to 10V greater than V
SW(OFF). Use the following
equations to calculate R and C;
Power dissipation (and power rating) of the resistor is;
The fast recovery diode must have a reverse voltage rating
greater than V
CLAMP.
FLYBACK REGULATOR CIRCUIT EXAMPLE
from a single 5V input. The output regulation of this circuit is
shown in Figure 23 and Figure 25, while the load transient
response is shown in Figure 24 and Figure 26. Switching
waveforms seen in this circuit are shown in Figure 27.
Transformer
Manufacturers’ Part Numbers
Type
AIE
Pulse
Renco
1
326-0637
PE-65300
RL-2580
2
330-0202
PE-65301
RL-2581
3
330-0203
PE-65302
RL-2582
FIGURE 20. Flyback Transformer Selection Guide
01146819
FIGURE 21. Snubber Circuit
LM1577/LM2577
www.national.com
24
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LM2577N-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 |
| LM2577N-ADJ/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 |
| LM2577S-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 |
| LM2577S-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 |
| LM2577S-12/NOPB | 制造商:Texas Instruments 功能描述:DC/DC Converter IC |
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