STCC05-B

8/13

Figure 8: Example of PCB layout improvement for higher immunity

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

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

Figure 10: Test circuit schematic

V

PS

MCU

RST\

V

DD

V

SS

1

2

4

1

3

3

V

PS

V

DD

RST\

Reset

5VREG

COM

STCC05

SMPS

BURST

GENERATOR

tr : 5ns

tp : 50 ns

MAINS

N

SYSTEM TESTED

10 cm

L

PE

N

L

PE

0.5kVto4 kV

BURST COUPLER

STCC05

MAINS FILTER

VDD

Cs

47uF

TR1

15V 5VA

SW3

Cps_1

100uF

BATTERY

9V5

Rzv 15k

MAINS

Cps_2

100nF

COMPRESSOR RELAY

RST

Cdd_2

100nF

SW1

Oscilloscope

U1

STCC05-B

1

2

3

4

5

6

7

8

9

10

11

12

18

19

20

16

15

14

13

17

Vps

SYN

INs

RL1

RL2

RL3

RL4

BZ1

BZ2

ENbz

COM

INBZ

ZVS

RST

VDD

IN1

IN2

IN3

IN4

OUTs

Cdd_1

100uF

VPS

LS

SPEED SENSOR

VPS

VPS

Czv

15nF

Optical Transmitter

ZVS

SW2

LS

ZVS

RELAY 3

VDD

Cup

100nF

SW4

Optical Receiver

RELAY 2

VDD

RST

TEST BOARD

BUZZER

RELAY 1

Cins

10nF

Rins

2.2k

Rs

560

D1~D4

1N4002

HFBR-0410

Optic Fiber

VDD

Cs

47uF

TR1

15V 5VA

SW3

Cps_1

100uF

BATTERY

9V5

Rzv 15k

MAINS

Cps_2

100nF

COMPRESSOR RELAY

RST

Cdd_2

100nF

SW1

Oscilloscope

U1

STCC05-B

1

2

3

4

5

6

7

8

9

10

11

12

18

19

20

16

15

14

13

17

Vps

SYN

INs

RL1

RL2

RL3

RL4

BZ1

BZ2

ENbz

COM

INBZ

ZVS

RST

VDD

IN1

IN2

IN3

IN4

OUTs

Cdd_1

100uF

VPS

LS

SPEED SENSOR

VPS

VPS

Czv

15nF

Optical Transmitter

ZVS

SW2

LS

ZVS

RELAY 3

VDD

Cup

100nF

SW4

Optical Receiver

RELAY 2

VDD

RST

TEST BOARD

BUZZER

RELAY 1

Cins

10nF

Rins

2.2k

Rs

560

D1~D4

1N4002

HFBR-0410

Optic Fiber