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Subject
OB6211 Demo Board Manual
Description:
The OB6211 Demo Board consists of a stereo 20W, class-D, audio power amplifier completed with
a small number of external components mounted on a printed-circuit board. It can be used to
directly drive speakers with an external analog audio source as the input. The audio application of
2 channels single-ended(SE) or 1 channel bridge-tied-load(BTL) is presented. The detailed
features, block diagram, schematics, BOM, PCB layout, application notes and test data are
described.
Key Features:
Stereo 20W SE output into 4 load at 26V
Mono 40W BTL output into 8 load at 26V
Up to 95dB SNR
Soft power on/off and mute/unmute minimize pop noise
Revision History
Revise Date
Version
2012-11-01
00
© On-Bright Electronics
2*20W Class-D Audio Amplifier
Board Model: AUOB6211.00 1245
Doc. No: OB_DOC_DBM_A_621100
First Issue
- 1 -
AUOB6211.00 1245
Reason/Issue
OB_DOC_DBM_A_621100
Confidential
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Table of Contents
Summary of Contents for On-Bright OB6211
- Page 1 Doc. No: OB_DOC_DBM_A_621100 Description: The OB6211 Demo Board consists of a stereo 20W, class-D, audio power amplifier completed with a small number of external components mounted on a printed-circuit board. It can be used to directly drive speakers with an external analog audio source as the input. The audio application of 2 channels single-ended(SE) or 1 channel bridge-tied-load(BTL) is presented.
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Page 2: Table Of Contents
2.4.5 Power Up..........................7 3. EMI Test Report ............................8 3.1 Conducted EMI Test ........................8 3.2 Radiation EMI Test .......................... 8 4. Reference ..............................9 4.1 PCB layout ............................9 4.2 Bill of Material..........................11 © On-Bright Electronics Confidential OB_DOC_DBM_A_621100 - 2 -... -
Page 3: Features
Soft power on/off and mute/unmute minimize pop noise • Eliminates the need of external heat sink • Space-saving surface mount 28-Pin HSOP28 high power package • Meet EN55022-ClassB , EN55014 EMI standard • © On-Bright Electronics Confidential OB_DOC_DBM_A_621100 - 3 -... -
Page 4: Application Reference
2.1 Demo Board Block Diagram 2.1.1 2 channels single-ended application Fig. 1 2 channels single-ended application System Block Diagram 2.1.2 1 channel bridge-tied-load application Fig. 2 1 channel bridge-tied-load application System Block Diagram © On-Bright Electronics Confidential OB_DOC_DBM_A_621100 - 4 -... -
Page 5: Terminal & Switch & Jack
Note1: Gain select setting Gain G1@S2 G0@S2 Action Switch 20dB MUTE GAIN M@S1 26dB UNMUTE 20dB 32dB SHUTDOWN 26dB S@S1 36dB ACTIVE 32dB 36dB Table 2. Gain select setting Table 3. mute and shutdown setting © On-Bright Electronics Confidential OB_DOC_DBM_A_621100 - 5 -... -
Page 6: Schematic
2*20W Class-D Audio Amplifier AUOB6211.00 1245 2.3 Schematic © On-Bright Electronics Confidential OB_DOC_DBM_A_621100 - 6 -... -
Page 7: Demo Board Specifications
2.4.1 Quick Start List for Stand-Alone Operation Follow these steps to use the OB6211 demo board stand-alone or when connecting it into existing circuits or equipment. Connections to the demo board can be made by inserting stripped wire or using banana plugs for the power supply and output connections. -
Page 8: Emi Test Report
The demo board passed EMI requirement with more than 6dB margin 3.1 Conducted EMI Test EN55014 @ 5W4ohm report 3.2 Radiation EMI Test EN55022 CLASS B @ 5W4ohm report,(speaker cable length 50cm) © On-Bright Electronics Confidential OB_DOC_DBM_A_621100 - 8 -... -
Page 9: Reference
2*20W Class-D Audio Amplifier AUOB6211.00 1245 4. Reference 4.1 PCB layout TOP Component View Bottom Component View © On-Bright Electronics Confidential OB_DOC_DBM_A_621100 - 9 -... - Page 10 2*20W Class-D Audio Amplifier AUOB6211.00 1245 Top Copper View Bottom Copper View © On-Bright Electronics Confidential OB_DOC_DBM_A_621100 - 10 -...
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Page 11: Bill Of Material
S1,S2 DIP SWITCH,2channel BTL+,BTL-,GATE _L,GATE_R,GND, Test Point Connector,red,1.32mm type GNDL,GNDR OUTL,OUTR,VCC PCB: AUOB6211. OB6211 EVM PCB, double layer 82*71*1.6 1 00 1245 ICs: audio amplifier HSOP28 OB6211 * For different speaker impendence application, recommended L1,L2,C10,C17,C12,C19 value, please refer to datasheet. - Page 12 AUOB6211.00 1245 Disclaimer On-Bright Electronics reserves the right to make corrections, modifications, enhancements, improvements, and other changes to its documents, products and services at any time and to discontinue any product or service without notice. Customers should obtain the latest relevant information before placing orders and should verify that such information is current and complete.