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1.5WATTVY-L Datasheet, PDF (1/3 Pages) Volgen Kaga Electronics Inc. – Correspond to Analog Ciruits, Ultra Low Noise 8mVp-p Small Size, Long-Life, Isolated Type DC-DC Converter
Application Notes
Correspond to Analog Ciruits, Ultra Low Noise 8mVp-p
Small Size, Long-Life, Isolated Type DC-DC Converter
1.5 Watt VY-L Series
<EMI Evaluation Test>
<Method to decrease the noise level>
VY-L series is most suitable for analog and digital circuit which has Usually for VY-L series, output capacitors are not required. However, in order to
achieved ultra low noise.
obtain lower noise level by taking advantage of the performance of the converte
The test data below is an EMI test data which proves that it passed the make sure to design the printed board with special attention to the following item
FCC Class B (3m) standards
The input/ output noise can be lowered.
RADIATED EMISSION FCC Class B <3m>
1. Use low impedance capacitor with good high frequency characteristic.
2. Shorten the lead of each capacitor as much as possible, and make it low lead
Model Name
VY05-12W06L
inductance.
Serial No.
ES1
3. Make the wiring loop space between the (+) and (-) of both input and output p
Power Supply
+5V
side as small as possible. The possibilities of leakage inductance can be
Load
±12V 65mA
decreased.
DET. Mode
Peak
4. Design the print pattern of the main circuit as thick and short as possible.
Limits
30MHz - 1000KHz
5. The pin side of VY-L series do not have a metallic shield, so if the pin side of
Band Number
3 Meas Mode : D
printed circuit board is ground plane, the radiation noise will be shut off and
Antenna Mode
Horizontal
noise can be lowered.
Test Equip.
TR4172, TR14307
Figure 7
Model Name
Serial No.
Power Supply
Load
DET. Mode
Limits
Band Number
Antenna Mode
Test Equip.
VY05-12W06L
ES1
+5V
±12V 65mA
Peak
30MHz- 1000KHz
3 Meas Mode : D
Vertical
TR4172, TR14307
Figure 9
Lowering the noise level of VY-SL series
C1=33µF C2=4.7µF C3=0.47µF (Electrolytic or multilayer ceramic)
Figure 10
Lowering the noise level of VY-WL series
C1=33µF C2, C3=4.7µF C4, C5=0.47µF (Electrolytic or multilayer ceramic)
Figure
Figure 11
Output noise of VY-05-12W06L (measured by figure 11 circuit)
+12V65mA
3.8mVp-p 100%
10mV/div
2µs/div
* The above test has been performed at the following site.
Testing institution: Shindengen Electric Manufacturing Co., Ltd. EMI Laboratory
Field intensity measuring set: R-205
Power supply terminal interfering voltage measuring set: C-205
Kaga Electronics/Volgen DC-DC CONVERTERS
-12V65mA
4.2mVp-p 0%
10mV/div
2µs/div
10mV
Figure 12
2μs
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