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LM3524DN Datasheet(PDF) 18 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
Part # LM3524DN
Description  Regulating Pulse Width Modulator
PDF  22 Pages
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Manufacturer  NSC [National Semiconductor (TI)]
Direct Link  http://www.national.com
Logo NSC - National Semiconductor (TI)

LM3524DN Datasheet(HTML) 18 Page - National Semiconductor (TI)

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Typical Applications (Continued)
This equation shows that the input, or inductor, current is
larger than the output current by the factor (1 + t
ON/tOFF).
Since this factor is the same as the relation between V
o and
V
IN,IIN(DC) can also be expressed as:
So far it is assumed
η = 100%, where the actual efficiency or
η
MAX 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 IIN,
through either V
SAT or VD1. For VSAT =VD1 = 1V this power
loss becomes I
IN(DC) (1V).
η
MAX is then:
This equation assumes only DC losses, however
η
MAX is
further decreased because of the switching time of Q1 and
D1.
www.national.com
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