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LM2698MMX-ADJ 데이터시트(PDF) 8 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
부품명 LM2698MMX-ADJ
상세설명  SIMPLE SWITCHER 1.35A Boost Regulator
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제조업체  NSC [National Semiconductor (TI)]
홈페이지  http://www.national.com
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Operation
Continuous Conduction Mode
The LM2698 is a current-mode, PWM boost regulator. A
boost regulator steps the input voltage up to a higher output
voltage. In continuous conduction mode (when the inductor
current never reaches zero at steady state), the boost regu-
lator operates in two cycles.
In the first cycle of operation, shown in
Figure 1 (a), the
transistor is closed and the diode is reverse biased. Energy
is collected in the inductor and the load current is supplied by
C
OUT.
The second cycle is shown in
Figure 1 (b). During this cycle,
the transistor is open and the diode is forward biased. The
energy stored in the inductor is transferred to the load and
output capacitor.
The ratio of these two cycles determines the output voltage.
The output voltage is defined as:
where D is the duty cycle of the switch.
Inductor
The inductor is one of the two energy storage elements in a
boost converter.
Figure 2 shows how the inductor current
varies during a switching cycle. The current through an
inductor is quantified as:
20012602
FIGURE 1. Simplified Boost Converter Diagram
(a) First Cycle of Operation (b) Second Cycle Of Operation
20012605
FIGURE 2. (a) Inductor Current (b) Diode Current
www.national.com
8


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