MC33368DR2(2000) 查看數據表（PDF） - ON Semiconductor
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MC33368DR2 Datasheet PDF : 20 Pages
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MC33368
2X Step–up
Isolation
Line Autoformer Transformer
115 Vrms
Input
Neutral
AC Power
Analyzer
PM 1000
W
VD
1
0
HI
VA PF Vrms Arms
A
Acf Ainst Freq HARM
L.O.
HI
V
L.O.
Voltech
EMI Filter
T
0.1
0 to 270 Vac
1.0 Output to
Power Factor
Correction
Circuit
An RFI filter is required for best performance when connecting the preconverter directly to the ac line. The filter attenuates the level of high frequency switching that
appears on the ac line current waveform. Figures 15 and 16 work well with commercially available two stage filters such as the Delta Electronics 03DPCG6. Shown
above is a single stage test filter that can easily be constructed with four ac line rated capacitors and a common–mode transformer. Coilcraft CMT3–28–2 was used
to test Figures 15 and 16. It has a minimum inductance of 28 mH and a maximum current rating of 2.0 A. Coilcraft CMT4–17–9 was used to test Figure 19. It has a
minimum inductance of 17 mH and a maximum current rating of 9.0 A. Circuit conversion efficiency η (%) was calculated without the power loss of the RFI filter.
Figure 17. Power Factor Test Setup
D2
D4
C5
1.0
92 to EMI D1
D3
270 Vrms Filter
16 Line
Vref
Vref
MC33368
1N4148
On/Off
Input
5.0 V Off
0 V On
R8
10 k
C9
330 µF
RD
2
AGnd
8
1.5 V
R5
1.3 M
Q Timer R
RS Latch
R
R
S
SQ
S
Set Dominant
Overvoltage
Comparator
Low
Load Detect
1.08 x Vref
15 V
UVLO
Zero
Current
Detect
13/8.0
1.2/1.0 6.9 V
Frequency
Clamp
Quickstart
Leading Edge
Blanking
Mult
5
R3
C2
Multiplier
10 k 0.01
4 Comp
C1
22
5.0 V
Reference
1 Vref
C6
0.1
VCC 3 FB
Vref
10 k
1.0 k
2N3904
1.0 k
VCC D8
R13
51 D6
12
C4
100
7 15 V
ZCD R4
T
22 k
Gate
11
PGnd
R11 Q1
10
10
13
FC
9
LEB
6
CS
DC
D5
Out
C3
330
MTW14N50E
R2
820 k
R7
0.1
R1
10 k
Figure 18. On/Off Control
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