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ML4803CS-2 bảng dữ liệu(PDF) 8 Page - Micro Linear Corporation

tên linh kiện ML4803CS-2
Giải thích chi tiết về linh kiện  8-Pin PFC and PWM Controller Combo
PDF  13 Pages
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nhà sản xuất  MICRO-LINEAR [Micro Linear Corporation]
Trang chủ  http://www.microlinear.com
Logo MICRO-LINEAR - Micro Linear Corporation

ML4803CS-2 bảng dữ liệu(HTML) 8 Page - Micro Linear Corporation

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ML4803
8
February 1999
Figure 4. Voltage Control Loop
60
40
20
0
–20
–40
–60
FREQUENCY (Hz)
0.1
10
1000
1
100
Power Stage
Overall Gain
Compensation
Network Gain
0
50
100
150
200
FREQUENCY (Hz)
0.1
1
10
1000
100
Power Stage
Overall
Compensation
Network
Figure 5. Voltage Loop Gain
Figure 6. Voltage Loop Phase
50
40
30
20
10
0
VEAO (V)
02
7
5
13
6
4
FF @ –55ºC
TYP @ –55ºC
TYP @ 155ºC
SS @ 155ºC
TYP @ ROOM TEMP
Figure 7. Internal Ramp Current vs. VEAO
R
fC
COMP
COMP
=
´´ ´
1
2
p
(3)
R
Hz
nF
k
COMP =
´´
=
1
628 30
16
330
.
W
C
f
R
ZERO
COMP
=
´´
´
1
2
10
p
(4)
C
Hz
k
F
ZERO =
´´
=
1
6 28 3
330
016
.
.
W
m
INTERNAL VOLTAGE RAMP
The internal ramp current source is programmed by way of
the VEAO pin voltage. Figure 7 displays the internal ramp
current vs. the VEAO voltage. This current source is used
to develop the internal ramp by charging the internal
30pF +12/–10% capacitor. See Figures 10 and 11. The
frequency of the internal programming ramp is set
internally to 67kHz.
PFC CURRENT SENSE FILTERING
In DCM, the input current wave shaping technique used
by the ML4803 could cause the input current to run away.
In order for this technique to be able to operate properly
under DCM, the programming ramp must meet the boost
inductor current down-slope at zero amps. Assuming the
programming ramp is zero under light load, the OFF-time
will be terminated once the inductor current reaches zero.
Subsequently the PFC gate drive is initiated, eliminating
the necessary dead time needed for the DCM mode. This
forces the output to run away until the VCC OVP shuts
down the PFC. This situation is corrected by adding an
TYPICAL APPLICATIONS (Continued)
ML4803
ML4803
IVEAO
35µA
IOUT
VO
220µF
RLOAD
667
Ω
330k
Ω
11.3M
Ω
0.15µF
15nF
POWER
STAGE
COMPENSATION
VEAO
∆VEAO +
–



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