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33981 데이터시트(PDF) 24 Page - Freescale Semiconductor, Inc

부품명 33981
상세설명  Single High Side Switch
PDF  37 Pages
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제조업체  FREESCALE [Freescale Semiconductor, Inc]
홈페이지  http://www.freescale.com
Logo FREESCALE - Freescale Semiconductor, Inc

33981 데이터시트(HTML) 24 Page - Freescale Semiconductor, Inc

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Analog Integrated Circuit Device Data
24
Freescale Semiconductor
33981
TYPICAL APPLICATIONS
EMC AND EMI RECOMMENDATIONS
Figure 24. Test Bench for Radiated Emission
EMC RESULTS AND IMPROVEMENTS
The 33981 OUT is connected to an inductive load (0.47
Ω
+ 1.0mH) switching at 20 kHz with duty = 80%. The current in
the load was 17 A continuous.
BOARD SETUP
The initial configuration of our 33981 board is represented
in Figure 25.
No SR capacitor is used. Therefore, the obtained
switching times are the maximum values. A capacitor of
1000
μF is connected between VPWR and GND.
Figure 25.
33981 Initial Configuration
CONDUCTED MEASUREMENTS
TEST SETUP
To perform a conducted emission measurement in
accordance with the CISPR 25 standard, the test bench in
Figure 26, Conducted Emission Test Setup, on page 24 was
developed.
Figure 26. Conducted Emission Test Setup
EFFECTS OF SOME PARAMETERS
The conducted emissions level rise with the duty cycle.
When the duty increases the di/dt on the VPWR line is higher.
The device has to deliver more current and provide more
energy. Figure 27 describes the effect of duty cycle increase
on the VPWR current waveform. The conducted emission
level rises with the output frequency. This is due to the
increasing number of commutations.
Key
1 EUT (grounded locally if
required in test plan)
8
Biconical antenna
2 Test harness
–
–
3 Load simulator (placement
and ground connection)
10 High quality double-
shielded coaxial cable
(50
Ω)
4 Power supply (location
optional)
11 Bulkhead connector
5 Artificial Network (AN)
12 Measuring instrument
6 Ground plane (bonded to
shielded enclosure)
13 RF absorber material
7 Low relative permittivity
support (
ερ ≤ 1.4)
14 Stimulation and monitoring
system
Out
GND
VPWR
33981
Power Supply
LISN
Measurement
Point for
Conducted
Emission
EUT
Non-Conductive
Material
Optical PWM Signal
Load (1.0 mH + 0.4
Ω)



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