HV9919DB1 Supertex, HV9919DB1 Datasheet - Page 9

• Manufacturer Part Number: HV9919DB1
• Description: LED Lighting Development Kits SINGLE HI CURR LED DRIVER DEMOBOARD
• Manufacturer: Supertex

EMI Signature
Board suspended about 3” above reference plane.
Limit Line:
Detector:
IF Bandwidth:
Shielding:
Without shielding :
With shielding :
The performance graphs above were obtained from the
board not having specific measures to suppress common
mode emissions, such as inclusion of a common mode in-
ductor in the AC line input circuitry. The above graphs show
how shielding can significantly reduce emissions, particu-
Supertex inc.
CISPR 15 Quasi Peak (9kHz to 30MHz)
Peak Hold
9kHz
2 copper shields, surrounding the power section on top and bottom of the board, terminated at the source
of the MOSFET.
100dBµV
100dBµV
50dBµV
50dBµV
10kHz
10kHz
110dBµV
110dBµV
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1235 Bordeaux Drive, Sunnyvale, CA 94089
90
90
100kHz
100kHz
66
66
80
80
9
larly in the upper frequency range. The shielding also was
instrumental in reducing the lower frequency emissions by
reducing magnetic field coupling from the main inductors
to the EMI filter inductors (EMI filter section kept outside of
shielded area).
1MHz
1MHz
56
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Tel: [phone]
56
10MHz
10MHz
60
60
●
www.supertex.com
HV9931DB2v1