Instruction/ maintenance manual of the product SI824XCLASSD-KIT SI8241 Silicon Laboratories
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Rev. 0.2 11/10 Copyright © 2010 by Si licon La bo ratories Si824xClassD-KIT Si824xClassD-KIT C LASS D A UDIO A MPLIFIER R EFERENCE D ESIGN U SER ’ S G UIDE 1.
Si824xClassD-KIT 2 Rev. 0.2 3. Hardware Overview and Demo 3.1. Reference Desi gn Board Architecture The Silicon Labs Class D reference de sign architecture uses a phase-shif t, self-oscillating mo dulation approach that is capabl e of achieving far greater signal-to-no ise ra tio than clock driven amplifiers (see Figure 2).
Si824xClassD-KIT Rev. 0.2 3 3.3. Powering up the Class D Amplifier and Playing Music After th e audio source , audio Y -cable, supplies, and speak ers have been prop erly connected as sho wn in Figure 3. 1. T urn on the ±12 V supplies. 2. Then, turn on the ±5 0 V supplies.
Si824xClassD-KIT 4 Rev. 0.2 4. Additional Features an d Architectural Considerations 4.1. Gate Drive Structure Figure 5 illustrates the ease with which the Si8241 can d riv e a two-state, half-bridge class D amplifier .
Si824xClassD-KIT Rev. 0.2 5 Figure 6. Over Current Protection Circuit 4.5. Undervolt age Protection The undervolt age protection comp arator monitors the positive bus volt age and releases the undervolt age lockout when the voltage is above 37 V . The amplifier star ts up after a one -second delay .
Si824xClassD-KIT 6 Rev. 0.2 5. Si8241-Based Cl ass D Amplifier Connection Description The Si8241-based Cla ss D Amplifier has two Si8241 ISOdrive rs and two Si8410 digit al isolators installe d. Refer to Figure 7 for the locations of th e various I/O connectors and major compone nts.
Si824xClassD-KIT Rev. 0.2 7 6. Schematics Figure 8. Si824x Class D Audio Amplifier Reference Des ign Schematic (1 of 2).
Si824xClassD-KIT 8 Rev. 0.2 Figure 9. Si824x Class D Audio Amplifier Refe rence Design Schematic (2 of 2).
Si824xClassD-KIT Rev. 0.2 9 7. Bill of Materials T able 1. Si824x Class D Audio Amplifier Reference Desig n Bill of Materials Qty Ref Description Mfr .
Si824xClassD-KIT 10 Rev. 0.2 4 C67–C70 82 µF , 63 V , KZE Series Electrolytic Cap EKZE630ESS820M JC5S Chemi-Con 565-1 721-ND 4 C71–C74 0.1 µF , 100 V , X7R, 1206 Ceramic Capa citor 12061C1 04MA T2A A VX 478-3786-6-ND 4 C75–C78 0.01 µF , 100 V , COG , 1206 Ceramic Capa citor 12061C1 03JA T2A A VX 478-3783-6-ND 2C 7 9 , C 8 0 0.
Si824xClassD-KIT Rev. 0.2 11 2 IC19, IC20 IC Comp Grnd-sens- ing LowPwr 8SOIC L T1671CS8#PBF Linear T ech L T1671CS8#PBF-ND 2 IC21, IC22 Isodriver Narrow Body Si8241BB-B-IS1 Silabs 7 J1–J7 1/4 inch-Faston 62409-1 Ty c o Electronics A24742-ND 1 J8 3 Pin Co nn Header 22-23-2031 Molex Inc.
Si824xClassD-KIT 12 Rev. 0.2 2R 1 6 , R 1 7 12.1 k , 2010 1% SMT Resistor ERJ-12SF1212U Panasonic ECG P12 .1KACCT -ND 3 R18, R21, R60 20 k , 0603 1% SMT Resistor ERJ-3EKF2002V Panasonic ECG P20.0KHCT -ND 2R 2 9 , R 3 0 4.99 k , 0603 1% SMT Resistor ERJ-3EKF4991V Panasonic ECG P4.
Si824xClassD-KIT Rev. 0.2 13 4 Insulator Insulator Mica .860X.520" .141" TO- 22 0 4672 Keystone 4672K-ND 4S c r e w Hdwr Mtg Screw TO- 220CASE 4/40 THR 1PC 4690 Keystone 4690K-ND 4S c r e w .
Si824xClassD-KIT 14 Rev. 0.2 8. Ordering Guide Ordering Part Number T ype Si824xClassD-KIT Audio Class D Amplifier re fe renc e design kit using Si8241BB-B-IS1.
Si824xClassD-KIT Rev. 0.2 15 D OCUMENT C HANGE L IST Revision 0.1 to Revision 0.2 Updated T able 1, “Si824x C lass D Audio Am plifier Reference Design Bill of Materials,” on page 9.
Si824xClassD-KIT 16 Rev. 0.2 C ONT ACT I NFORMATION Silicon Laboratori es Inc. 400 West Cesar Chavez Austin, TX 78701 T el: 1+(512) 416-8500 Fax: 1+(512) 416-9669 T oll Free: 1+(877) 444-30 32 Please visit the Silicon Labs T echnical Supp ort web page: https://www .
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