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Si824xClassD-KIT
Rev. 0.2 3
3.3. Powering up the Class D Amplifier and Playing Music
After the audio source, audio Y-cable, supplies, and speakers have been properly connected as shown in Figure 3.
1. Turn on the ±12 V supplies.
2. Then, turn on the ±50 V supplies. Notice that LED1 should turn on for about 1 sec and then turn off. This on and
off sequence clears any overcurrent protection faults and indicates to the user that the amplifier is ready to
amplify the audio input signal. If the LED does not turn off after about 1 sec, cycle on and off the ±12 V supplies.
Repeat this step until the LED turns off. If the LED never turns off, the board has probably been damaged.
3. With the audio source's volume turned down to its lowest output level, start the audio source.
4. Adjust the volume to the desired listening level.
5. Enjoy your music!
Note: If the power being delivered to the speakers is too great, the overcurrent protection circuitry will trip and shut
off audio to the speakers, protecting the amplifier. LED1 will turn on in this condition. See "4.4. Overcurrent
Protection" on page 4 for more details on clearing this fault condition.
Figure 3. Si824xClassD-KIT (Top View)
Figure 4. Si824xClassD-KIT (Bottom View)
Speaker B
(up to 150 W)
_
_
Speaker A
(up to 150 W)
Audio Source/
MP3 Player
+12 V (500 mA)
-12 V (500 mA)
+50 V (3 A)
-50 V (3 A)
PGND
GND