参数资料
型号: LM2577M-12/NOPB
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, PDSO24
封装: 0.300 INCH, SO-24
文件页数: 16/31页
文件大小: 1406K
代理商: LM2577M-12/NOPB
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
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相关PDF资料
PDF描述
LM2577NADJ 6 A SWITCHING REGULATOR, 62 kHz SWITCHING FREQ-MAX, PDIP24
LM2577S-15/NOPB 6 A SWITCHING REGULATOR, 62 kHz SWITCHING FREQ-MAX, PSSO5
LM2577SADJ 6 A SWITCHING REGULATOR, 62 kHz SWITCHING FREQ-MAX, PSSO5
LM2577S-12X 6 A SWITCHING REGULATOR, 62 kHz SWITCHING FREQ-MAX, PSSO5
LM2577TADJFLOWLB03 6 A SWITCHING REGULATOR, 62 kHz SWITCHING FREQ-MAX, PZFM5
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