Cypress CY3274, Руководство пользователя

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48 CY3274 Cypress High Voltage Programmable PLC Development Kit Guide, Doc. # 001-53598 Rev. *G
PLC Development Board
4.3.5 High Voltage with Switched Mode Power Supply (SMPS)
This section takes the power from the powerline and generates necessary low DC voltage for the
operation of the PLC transceiver and other components on the chip.
Table 4-3. Key High Voltage with SMPS Components
The key components are circled in the following schematic
Figure 4-8. Power Supply Schematic
4.3.6 Transmit Filter, Transmit Amplifier, and Receive Filter
The transmit signal from the FSK_OUT pin of the CY8CPLC20 device is filtered (for FCC and
CENELEC compliance) and amplified (for driving the signal on the powerline). The passive receive
filter prepares the signal for the FSK_IN pin of the CY8CPLC20 device.
Table 4-4. Key Transmit Amplifier and Filtering Components
Component Description
J7 This is the two pin connector where the AC cable hooks up to the powerline.
F1 Protection fuse for the circuit.
D7 Full wave bridge rectifier diode IC.
T3 Common mode choke.
U6 iW1690-07 – iWatt high performance AC/DC power supply controller.
T2 Flyback transformer.
U5 5-V regulator.
Component Description
U2, U3
These opamps filter the signal from the CY8CPLC20 removing the harmonics. The filter
stages are only required to meet FCC Part 15 and/or European CENELEC EN50065-1:2001
signaling specifications. They are not required to achieve robust PLC communication.
U4, Q1, Q2 These opamp and high gain transistors are used for the power amplification stage.
4.7uF, 400V
C31
750k, 1%
R32
820k, 1%
R34
PGND
PGND
470pF
C28
GND
330uF, 16V
C32
GND
VPWR
Vin
3
1
Vout
2
GND
U5
LD1117DT50CTR
GND
VDD
GND
Vout
7
Isense
6
IBC
4
GND
5
Vin
2
Vcc
8
Vsense
1
Rin
3
U6
iW1690-07
PGND
1 2
B1100
D9
1.0
R37
68k, 1%
R36
100k
R38
2
3
1
Q4
TS13003HV
3.9
R35
PGND
6.8k, 1%
R40
12k, 1%
R39
10uF, 50V
C35
9
8
1
4
5
2
T2
1 2
3 4
24mH
T3
-
2
~
3
+
1
~
4
DF10S
D7
LINE
NEUTRAL
1.5mH
L3
22uH
L4
10.0uF
C33
0.1uF
C27
GND
10.0uF
C26
10.0k
R33
0.1uF
C34
4.7uF, 400V
C30
1 2
B1100
D8
GND
X1-CAP
Y1-CAP
0.022uF
C29
10, 5W
R41
402
R5
DS1
GND
BLUE
PWR