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ML4812IP Folha de dados(PDF) 7 Page - Micro Linear Corporation

Nome de Peças ML4812IP
Descrição Electrónicos  Power Factor Controller
Download  16 Pages
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Fabricante Electrônico  MICRO-LINEAR [Micro Linear Corporation]
Página de início  http://www.microlinear.com
Logo MICRO-LINEAR - Micro Linear Corporation

ML4812IP Folha de dados(HTML) 7 Page - Micro Linear Corporation

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ML4812
7
ENABLE
VREF
VREF
GEN.
9V
INTERNAL
BIAS
5V VREF
VCC
+
VCC (V)
0
30
20
40
10
25
20
15
10
5
0
25
20
15
10
5
0
TEMPERATURE (degrees)
–60
20
60
140
100
–20
–40
40
80
120
0
OPERATING CURRENT
STARTUP
IREF (mA)
040
100
20
60
120
80
0
-4
-8
-12
-16
-20
-24
Figure 10. Reference Load Regulation
Figure 8. Under-Voltage Lockout Block Diagram
Figure 9a. Total Supply Current vs. Supply Voltage
Figure 9b. Supply Current (ICC) vs. Temperature
TYPICAL APPLICATIONS
INPUT INDUCTOR (L1) SELECTION
The central component in the regulator is the input boost
inductor. The value of this inductor controls various
critical operational aspects of the regulator. If the value is
too low, the input current distortion will be high and will
result in low power factor and increased noise at the
input. This will require more input filtering. In addition,
when the value of the inductor is low the inductor dries
out (runs out of current) at low currents. Thus the power
factor will decrease at lower power levels and/or higher
line voltages. If the inductor value is too high, then for a
given operating current the required size of the inductor
core will be large and/or the required number of turns
will be high. So a balance must be reached between
distortion and core size.
One more condition where the inductor can dry out is
analyzed below where it is shown to be maximum duty
cycle dependent.
For the boost converter at steady state:
V
V
D
OUT
IN
ON
=
-
1
(1)
Where DON is the duty cycle [TON/(TON + TOFF)]. The
input boost inductor will dry out when the following
condition is satisfied:
Vt V
D
IN
OUT
ON
()
(
)
<´ -
1
(2)
or
VD
V
INDRY
ON
OUT
=-
´
[(max)]
1
(3)
VINDRY: voltage where the inductor dries out.
VOUT: output DC voltage.
Effectively, the above relationship shows that the resetting
volt-seconds are more than setting volt-seconds. In energy
transfer terms this means that less energy is stored in the
inductor during the ON time than it is asked to deliver
during the OFF time. The net result is that the inductor
dries out.


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