參數(shù)資料
型號： LM1577KADJ
廠商： National Semiconductor Corporation
英文描述： SIMPLE SWITCHER-R Step-Up Voltage Regulator
中文描述： SIMPLE SWITCHER系列- R的升壓穩(wěn)壓器
文件頁數(shù)： 21/27頁
文件大?。?/td> 870K
代理商： LM1577KADJ
Application Hints
(Continued)
Transformer
Input
Dual
Maxi-
mum
Output
Current
325 mA
275 mA
225 mA
700 mA
575 mA
500 mA
800 mA
700 mA
575 mA
900 mA
825 mA
700 mA
Type
Voltage
Output
Voltage
±
10V
±
12V
±
15V
±
10V
±
12V
±
15V
±
10V
±
12V
±
15V
±
10V
±
12V
±
15V
L
P
= 100 μH
N = 1
5V
5V
5V
10V
10V
10V
12V
12V
12V
15V
15V
15V
1
2
L
P
= 200 μH
N = 0.5
3
L
P
= 250 μH
N = 0.5
In addition to this bypass cap, a larger capacitor (
≥
47 μF)
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
≥
200 μH. 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
)
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
The circuit of Figure 22 produces
±
15V (at 225 mA each)
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
Type
1
2
3
Manufacturers’ Part Numbers
AIE
Pulse
326-0637
PE-65300
330-0202
PE-65301
330-0203
PE-65302
Renco
RL-2580
RL-2581
RL-2582
FIGURE 20. Flyback Transformer Selection Guide
DS011468-19
FIGURE 21. Snubber Circuit
www.national.com
21
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