MC33368 Motorola, MC33368 Datasheet - Page 13

• Manufacturer Part Number: MC33368
• Description: HIGH VOLTAGE GREENLINEE POWER FACTOR CONTROLLER
• Manufacturer: Motorola

5.0 V
0 V
MOTOROLA ANALOG IC DEVICE DATA
Neutral
1N4148
On/Off
115 Vrms
Input
Line
270 Vrms
Off
On
Input
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
92 to
Autoformer
330 F
R3
10 k
R5
1.3 M
10 k
Filter
EMI
R8
C9
V ref
C2
0.01
AGnd
2X Step–up
Isolation
Transformer
Mult
D2
D1
RD
8
2
5
1.5 V
Multiplier
V ref
D3
D4
Load Detect
AC Power
(%) was calculated without the power loss of the RFI filter.
Analyzer
PM 1000
4
Low
1
Comp
C1
22
1.0 k
Figure 17. Power Factor Test Setup
Quickstart
0
C5
1.0
Q
1.08 x V ref
Overvoltage
Comparator
W
V D Acf Ainst Freq HARM
Set Dominant
MC33368
R S Latch
R
R
S
S
S
Timer
1
VA
Figure 18. On/Off Control
Q
V ref
C6
0.1
PF V rms A rms
1.0 k
R
MC33368
Reference
5.0 V
V ref
Leading Edge
Zero
Current
Detect
Blanking
UVLO
2N3904
15 V
Frequency
Clamp
A
V CC
L.O.
1.2/1.0
HI
10 k
16
3
Voltech
13/8.0
Line
FB
6.9 V
HI
L.O.
V
V CC
ZCD
Gate
PGnd
10
13
FC
LEB
CS
12
11
9
6
7
15 V
D8
22 k
0.1
R4
C4
100
EMI Filter
R13
51
R11
10
T
D6
Q1
T
1.0
Power Factor
MTW14N50E
0 to 270 Vac
Output to
Correction
Circuit
R7
0.1
D5
820 k
10 k
13
R2
R1
C3
330
Out
DC