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Silicon Laboratories SI824XCLASSD-KIT SI8241 manual

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Table of contents for the manual

  • Page 1

    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. Kit Content s The Si824x Class D Audio Amplifier Refe renc e Design Kit contains the following items:  Audio Class D A mplifier refere nce design board featur ing:  Si8241 ISOdriv[...]

  • Page 2

    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). This self- oscillating i[...]

  • Page 3

    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. Notice that LED1 should turn on for about 1 sec and then turn off. Th is o[...]

  • Page 4

    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 . The boot supply tied to D1 must be 12 V higher than the –50 V reference (–38 V) so that the MOSFET s each have a 12 V drive si[...]

  • Page 5

    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 . Note that the red LED remains lit when the amplif[...]

  • Page 6

    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. Relevant user connectio n points are detailed below .  J1 +50 [...]

  • Page 7

    Si824xClassD-KIT Rev. 0.2 7 6. Schematics Figure 8. Si824x Class D Audio Amplifier Reference Des ign Schematic (1 of 2)[...]

  • Page 8

    Si824xClassD-KIT 8 Rev. 0.2 Figure 9. Si824x Class D Audio Amplifier Refe rence Design Schematic (2 of 2)[...]

  • Page 9

    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 . Part Number Mfr Digikey Part Number 2C 1 , C 2 1µ F , 2 5V , X 5 R , 0805 Ceramic Capa citor 08053D105KA T2A A VX 478-1409-6-ND 2C 3 , C 4 1 µF , 16 V , 3216 T antalum Capa citor T491A105M016A T K[...]

  • Page 10

    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 0.47 µF , 250 [...]

  • Page 11

    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. WM4201-ND 2 J9, J10 Conn RCA Jack Metal R/A YEL PCB RCJ-014 [...]

  • Page 12

    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 P4.99KHCT -ND 4 R23, R24, R39, R40 100 k  , 0603 1% SMT Re[...]

  • Page 13

    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 Hdwr Mtg Screw 1/ 4" 4/40 , PCB L- Bracket Mount 9900 Keystone 9900K-ND 4 Lock Wa s h e r Hdw r Mtg Lock- washer Plastic 2PC 4693 Keystone 4693K-[...]

  • Page 14

    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.[...]

  • Page 15

    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.[...]

  • Page 16

    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 .silabs.com/support/pages/contacttechnicalsupport.aspx and register to submit a techn[...]