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參數(shù)資料
| 型號： | LM2622-ADJMWC |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 2.3 A SWITCHING REGULATOR, 1500 kHz SWITCHING FREQ-MAX, UUC |
| 封裝： | WAFER |
| 文件頁數(shù)： | 3/19頁 |
| 文件大?。?/td> | 478K |
| 代理商： | LM2622-ADJMWC |
Operation (Continued)
The phase margin can also be improved by adding C
C2 as
discussed earlier in the section. The equation for A
DC is
given below with additional equations required for the calcu-
lation:
mc ) 0.072fs (in V/s)
where R
L is the minimum load resistance, VIN is the maxi-
mum input voltage, g
m is the error amplifier transconduc-
tance found in the
Electrical Characteristics table, and R
D-
SON
is the value chosen from the graph ’R
DSON vs. VIN ’in
the
Typical Performance Characteristics section.
Layout Considerations
The input bypass capacitor C
IN, as shown in the typical
operating circuit, must be placed close to the IC. This will
reduce copper trace resistance which effects input voltage
ripple of the IC. For additional input voltage filtering, a 100nF
bypass capacitor can be placed in parallel with C
IN, close to
the V
IN pin, to shunt any high frequency noise to ground. The
output capacitor, C
OUT, should also be placed close to the
IC. Any copper trace connections for the C
OUT capacitor can
increase the series resistance, which directly effects output
voltage ripple. The feedback network, resistors R
FB1 and
R
FB2, should be kept close to the FB pin, and away from the
inductor, to minimize copper trace connections that can in-
ject noise into the system. Trace connections made to the
inductor and schottky diode should be minimized to reduce
power dissipation and increase overall efficiency. For more
detail on switching power supply layout considerations see
Application Note AN-1149:
Layout Guidelines for Switching
Power Supplies.
LM2622
www.national.com
11
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