RDK-91 Power Integrations, RDK-91 Datasheet - Page 33

• Manufacturer Part Number: RDK-91
• Description: KIT DESIGN REF TINYSWITCH-III
• Manufacturer: Power Integrations
• Series: TinySwitch®-IIIr

Specifications of RDK-91

• Main Purpose: AC/DC, Primary Side
• Outputs And Type: 1, Non-Isolated
• Power - Output: 12W
• Voltage - Output: 12V
• Current - Output: 1A
• Voltage - Input: 85 ~ 265VAC
• Regulator Topology: Flyback
• Board Type: Fully Populated
• Utilized Ic / Part: TNY274, TNY275, TNY276, TNY277, TNY278, TNY279, TNY280
• Product: Accessories & Kits
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Frequency - Switching: -
• Other names: 596-1194

14 Audible Noise
An open-frame (no enclosure) unit was tested with an Audio Precision Analyzer, using a
microphone positioned one inch from the core of transformer T1. The test was done with
the unit in an acoustically isolated and dampened chamber. The load was adjusted until
a maximum reading was obtained.
35 dBrA is considered the acceptable limit for frequencies below 18 kHz. An enclosure
will typically further reduce measurable acoustic noise levels by an additional 10 dBrA.
Audio Precision
Figure 29 – Audible Noise V
Audio
Figure 31 – Audible Noise V
Note: Shaded area obscured due to ambient noise.
Page 33 of 37
d
B
A
d
B
A
r
r
+80
+70
+60
+50
+40
+30
+20
+10
+80
+70
+60
+50
+40
+30
+20
+10
-10
-20
-30
-10
-20
-30
+0
+0
0
0
Color
Green
Color
Green
Line Style
Solid
Line Style
Solid
2k
2k
Thick
1
Thick
1
I
4k
4k
I
OUT
OUT
Data
Fft.Ch.1 Ampl
Data
Fft.Ch.1 Ampl
=1 A.
6k
6k
= 350 mA.
Axis
Left
Axis
Left
8k
8k
Arts_audionoise1.at2
Arts_audionoise1.at2
10k
10k
Hz
Hz
12k
12k
IN
IN
= 120 VAC;
= 230 VAC;
14k
14k
16k
16k
18k
08/17/05 15:04:17
18k
08/17/05
20k
20k
22k
22k
Audio Precision
Figure 30 – Audible Noise V
Audio Precision
Figure 32 – Audible Noise V
B
A
d
d
B
A
r
r
+80
+70
+60
+50
+40
+30
+20
+10
+80
+70
+60
+50
+40
+30
+20
+10
-10
-20
-30
-10
-20
-30
+0
+0
Tel: [phone] Fax: [phone]
0
0
Color
Green
Color
Green
Line Style
Solid
Line Style
Solid
2k
2k
Thick
1
Thick
1
4k
4k
I
I
OUT
OUT
Data
Fft.Ch.1 Ampl
Data
Fft.Ch.1 Ampl
6k
6k
= 1 A.
=1.2 A.
Axis
Left
Axis
Left
8k
8k
Arts_audionoise1.at2
Arts_audionoise1.at2
Power Integrations
10k
10k
www.powerint.com
Hz
Hz
12k
IN
12k
IN
= 120 VAC;
= 230 VAC;
14k
14k
16k
16k
18k
18k
08/17/05 15:11:39
08/17/05 15:09:38
20k
20k
22k
22k