參數(shù)資料
型號(hào): LM2524D
廠商: National Semiconductor Corporation
英文描述: Regulating Pulse Width Modulator
中文描述: 調(diào)節(jié)脈沖寬度調(diào)制器
文件頁數(shù): 18/22頁
文件大?。?/td> 1172K
代理商: LM2524D
Typical Applications
(Continued)
This equation shows that the input, or inductor, current is
larger than the output current by the factor (1 + t
ON
/t
OFF
).
Since this factor is the same as the relation between V
o
and
V
IN
, I
IN(DC)
can also be expressed as:
So far it is assumed
η
= 100%, where the actual efficiency or
η
will be somewhat less due to the saturation voltage of
Q1 and forward on voltage of D1. The internal power loss
due to these voltages is the average I
L
current flowing, or I
,
through either V
SAT
or V
. For V
= V
D1
= 1V this power
loss becomes I
IN(DC)
(1V).
η
MAX
is then:
This equation assumes only DC losses, however
η
is
further decreased because of the switching time of Q1 and
D1.
L
www.national.com
18
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