STCC05-B Datasheet, PDF (8/13 Pages) STMicroelectronics – HOME APPLIANCE CONTROL CIRCUIT

STCC05-B
Figure 8: Example of PCB layout improvement for higher immunity
2
SMPS
V_PS
V_PS
3
V_DD
5VREG
Reset
RST\
STCC05
COM
1
V_DD
3
RST\
4 _MCU
V_SS
1
■ STCC05 ELECTROMAGNETIC COMPATIBILITY
Standards such as IEC61000-4-x evaluate the electromagnetic compatibility of appliance systems. To test
the immunity level of the STCC05 to the IEC61000-4-4 (Electrical Fast Transient Bursts), a board repre-
sentative of usual application control unit should be considered by applying the immunity design rules
defined in the previous paragraph.
IEC61000-4-4 test does not allow any measurement equipment to be connected to the tested system, as
it would corrupt the test results. That is why this board should include a remote monitoring circuit based
on optic fibers. Thus, without any electrical link with an oscilloscope, it is possible to monitor the V_DD volt-
age as well as the /RST or the ZVS outputs of the STCC05, during the IEC61000-4-4 test. This optical link
detects parasitic commutations of outputs as short as 60ns.
With this board, and the burst generator coupled to the mains as specified in the IEC61000-4-4 standard
(see the following principle diagram), the STCC05 has been tested successfully at 4kV.
Figure 9: IEC61000-4-4 Electrical Fast Transient
Burst general STCC05 test circuit
0.5 kV to 4 kV
tr : 5ns
tp : 50 ns
BURST
GENERATOR
MAINS
MAINS FILTER
L
PE
N
BURST COUPLER
SYSTEM TESTED
L
PE
STCC05
N
10 cm
Figure 10: Test circuit schematic
MAINS
TR1 15V 5VA
VPS
VDD
D1~D4
1N4002
SPEED SENSOR
VPS
Rins
2.2k
Rzv 15k
Cps_1
100uF
Czv
15nF
Cins
10nF
RELAY 1
RELAY 2
RELAY 3
COMPRESSOR RELAY
VPS
Oscilloscope
Optical Receiver
Cps_2
100nF
BUZZER
Rs
560
U1
STCC05-B
1
Vps
2 _SYN
3 _INs
4 _RL1
5 _RL2
6 _RL3
7 _RL4
8 _BZ1
9 _BZ2
10 _ENbz
20
VDD
RST ¹⁹
ZVS ¹⁸
OUTs ¹⁷
IN1 ¹⁶
IN2 ¹⁵
IN3 ¹⁴
IN4 ¹³
INBZ ¹²
COM ¹¹
Cdd_1
100uF
Cdd_2
100nF
RST
ZVS
Cup
100nF
LS
SW1
SW2
VDD
SW3
SW4
Cs
47uF
HFBR-0410
Optic Fiber
Optical Transmitter
BATTERY
9V5
VDD
RST
LS
ZVS
TEST BOARD
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