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LM2700 Folha de dados(PDF) 8 Page - Texas Instruments

Nome de Peças LM2700
Descrição Electrónicos  600kHz/1.25MHz, 2.5A, Step-up PWM DC/DC Converter
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Fabricante Electrônico  TI1 [Texas Instruments]
Página de início  http://www.ti.com
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LM2700 Folha de dados(HTML) 8 Page - Texas Instruments

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VOUT =
VIN
1-D
, D' = (1-D) =
VIN
VOUT
LM2700
SNVS152B – MAY 2004 – REVISED MAY 2004
www.ti.com
Typical Performance Characteristics (continued)
Frequency
Frequency
vs.
vs.
VIN
VIN
(600 kHz)
(1.25 MHz)
Operation
Figure 3. Simplified Boost Converter Diagram
(a) First Cycle of Operation (b) Second Cycle Of Operation
CONTINUOUS CONDUCTION MODE
The LM2700 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 regulator operates in two cycles.
In the first cycle of operation, shown in Figure 3 (a), the transistor is closed and the diode is reverse biased.
Energy is collected in the inductor and the load current is supplied by COUT.
The second cycle is shown in Figure 3 (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 approximately as:
(1)
where D is the duty cycle of the switch, D and D
′ will be required for design calculations.
8
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