MC33981BHFK Freescale Semiconductor, MC33981BHFK Datasheet - Page 27

• Manufacturer Part Number: MC33981BHFK
• Description: HF 4.0MOHM RDSON SWITCH
• Manufacturer: Freescale Semiconductor

several antenna types must be used:
EMC RESULTS AND IMPROVEMENTS
+ 1.0mH) switching at 20 kHz with duty = 80%. The current in
the load was 17 A continuous.
Analog Integrated Circuit Device Data
Freescale Semiconductor
Key
1
2
3
4
5
6
7
To measure radiated emission over all frequency ranges,
• 0.15 MHz to 30 MHz: 1.0 m vertical monopole in
• 30 MHz to 200 MHz: a biconical antenna used in
• 200 MHz to 1,000 MHz: a log-periodic antenna used in
The 33981 OUT is connected to an inductive load (0.47 
EUT (grounded locally if
required in test plan)
Test harness
Load simulator (placement
and ground connection)
Power supply (location
optional)
Artificial Network (AN)
Ground plane (bonded to
shielded enclosure)
Low relative permittivity
support (
vertical polarization.
vertical and horizontal polarization.
vertical and horizontal polarization.
Figure 24. Test Bench for Radiated Emission

 1.4)
10 High quality double-
11 Bulkhead connector
12 Measuring instrument
13 RF absorber material
14 Stimulation and monitoring
8
–
Biconical antenna
–
shielded coaxial cable
(50 )
system
BOARD SETUP
in
switching times are the maximum values. A capacitor of
1000 F is connected between VPWR and GND.
CONDUCTED MEASUREMENTS
TEST SETUP
accordance with the CISPR 25 standard, the test bench in
Figure 26
Figure
The initial configuration of our 33981 board is represented
No SR capacitor is used. Therefore, the obtained
To perform a conducted emission measurement in
Figure 26. Conducted Emission Test Setup
25.
Figure 25.
was developed.
33981
33981
EMC AND EMI RECOMMENDATIONS
Initial Configuration
Out
TYPICAL APPLICATIONS
V
PWR
Power Supply
LISN
Measurement
Point for
Conducted
Emission
EUT
Non-Conductive
Material
Load (1.0 mH + 0.47 Ω)
Optical PWM Signal
GND
33981
27