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| 型号： | LMX2575HVMX-12 |
| 厂商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分类： | 稳压器 |
| 英文描述： | 3.2 A SWITCHING REGULATOR, 63 kHz SWITCHING FREQ-MAX, PDSO24 |
| 封装： | SMT-24 |
| 文件页数： | 6/30页 |
| 文件大小： | 676K |
| 代理商： | LMX2575HVMX-12 |
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(Continued)
PROCEDURE (Adjustable Output Voltage Versions)
EXAMPLE (Adjustable Output Voltage Versions)
3. Output Capacitor Selection (C
OUT)
A. The value of the output capacitor together with the induc-
tor defines the dominate pole-pair of the switching regulator
loop. For stable operation, the capacitor must satisfy the fol-
lowing requirement:
The above formula yields capacitor values between 10 F
and 2000 F that will satisfy the loop requirements for stable
operation. But to achieve an acceptable output ripple volt-
age, (approximately 1% of the output voltage) and transient
response, the output capacitor may need to be several times
larger than the above formula yields.
B. The capacitor’s voltage rating should be at last 1.5 times
greater than the output voltage. For a 10V regulator, a rating
of at least 15V or more is recommended.
Higher voltage electrolytic capacitors generally have lower
ESR numbers, and for this reasion it may be necessary to
select a capacitor rate for a higher voltage than would nor-
mally be needed.
3. Output Capacitor Selection (C
OUT)
A.
However, for acceptable output ripple voltage select
C
OUT ≥ 220 F
C
OUT = 220 F electrolytic capacitor
4. Catch Diode Selection (D1)
A. The catch-diode current rating must be at least 1.2 times
greater than the maximum load current. Also, if the power
supply design must withstand a continuous output short, the
diode should have a current rating equal to the maximum
current limit of the LM2575. The most stressful condition for
this diode is an overload or shorted output. See diode selec-
tion guide in
Figure 8.
B. The reverse voltage rating of the diode should be at least
1.25 times the maximum input voltage.
4. Catch Diode Selection (D1)
A. For this example, a 3A current rating is adequate.
B. Use a 40V MBR340 or 31DQ04 Schottky diode, or any of
the suggested fast-recovery diodes in
Figure 8.
5. Input Capacitor (C
IN)
An aluminum or tantalum electrolytic bypass capacitor lo-
cated close to the regulator is needed for stable operation.
5. Input Capacitor (C
IN)
A 100 F aluminum electrolytic capacitor located near the in-
put and ground pins provides sufficient bypassing.
To further simplify the buck regulator design procedure, National Semiconductor is making available computer design software to
be used with the Simple Switcher line of switching regulators. Switchers Made Simple (version 3.3) is available on a (312") dis-
kette for IBM compatible computers from a National Semiconductor sales office in your area.
www.national.com
14
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