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8

Document Number 83685

Rev. 1.5, 26-Oct-04

SFH6731/ SFH6732

Vishay Semiconductors

Figure 20. Test Circuit for Common Mode Transient Immunity and Typical Waveforms

isfh6731_19

All diodes are 1N916 or 1N3064

The Probe and Jig Capacitances are included in C1 and C2

Pulse generator

tr,tf =5ns

f=100kHz

10% Duty cycle

1

2

3

4

Input IF

Monitoring

Node

C1 = 120 pF

C2 =15pF R2=5kOhm

R3 = 619 Ohm

VCC

Gnd

VCC

5V

Output Vo

Monitoring

Node

D1

D2

D3

D4

IF

R1

0.1

µF

Bypass

8

7

6

5

R1

IF (ON)

2.15 kOhm

1.6 mA

681 Ohm

5mA

1.1 kOhm

3mA

Input IF

Output VO

IFon

50% IFon

0mA

VOH

1.3 V

tPLH

tPHL

VOL

isfh6731_20

0.1

µF

Bypass

Output VO

Monitoring

Node

1

2

3

4

6

7

8

VCC

A

B

R

Pulse Generator

+

–

VCM

5

Output VO

VCM

400V/50V

Switch at A: IF = 1.6 mA

0V

VOH

VO (min)

VOL

VO (max)

Switch at B: IF =0mA

VCC

Gnd