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LM3224 Scheda tecnica(PDF) 9 Page - Texas Instruments

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Il numero della parte LM3224
Spiegazioni elettronici  615kHz/1.25MHz Step-up PWM DC/DC Converter
Download  26 Pages
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Produttore elettronici  TI1 [Texas Instruments]
Homepage  http://www.ti.com
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LM3224 Scheda tecnica(HTML) 9 Page - Texas Instruments

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VIN
COUT
PWM
L
RLOAD
V
IN
L
C
OUT
R
LOAD
X
V
IN
L
C
OUT
R
LOAD
Cycle
1
Cycle
2
(a)
(b)
+
V
OUT
-
+
V
OUT
-
D
0
_
10
_
20
_
30
_
40
_
50
_
100
_
0.1
1
_
10
_
100
_
1000
_
LOAD CURRENT (mA)
60
_
70
_
80
_
90
_
10000
_
VOUT = 8V
VIN = 4.2V
VIN = 5.5V
VIN = 2.7V
VIN = 3.3V
LM3224
www.ti.com
SNVS277B – DECEMBER 2004 – REVISED SEPTEMBER 2005
Typical Performance Characteristics (continued)
1.25MHz Efficiency
vs.
Load Current
Operation
Figure 2. Simplified Boost Converter Diagram
(a) First Cycle of Operation (b) Second Cycle Of Operation
CONTINUOUS CONDUCTION MODE
The LM3224 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 2 (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 2 (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:
Copyright © 2004–2005, Texas Instruments Incorporated
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