AN12948A PANASONIC
Document overview
- Manufacturer or author: Provided By digicamel.com
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Technical content
Datasheet sections
1Publication date: April 2007 SDF00042AEB DATA SHEET AN12948APart No.
Audio Power IC for Note PC Overview AN12948A is the stereo BTL amplifier which contained the AGC circuit for clip prevention of a speaker output and headphone amplifier within charge pump. This IC performs a mode change by pararel cont rol system. (Standby function ON/OFF change etc.) Features y In order to realize high efficiency of output power, it adopts CMOS power amplifier circuit . y Max. Power: 1.4 W (VCCSP = 5 V, RL = 8 Ω, THD = 10%)
2.2 W (VCCSP = 5 V, RL = 4 Ω, THD = 10%)
y The resistance and the capacitor of a detector circuit which were being used for the conventional AGC. y The filter circuit for the frequency response deci sion can be composed of the input circuit. y Built-in direct drive headphone amplifier within charge pump. y STBY function (countermeasure pop noise) The standby terminal of the speaker amplifier and the hea dphone amplifier is prepared by each of two terminals. When either of two terminals becomes "High", it is standby OFF. y AGC ON/OFF function y AGC ON Level select function y AGC attack time select function y AGC recovery time select function y Cellular phone measures RF noise prevention y Built-in over current protection Applications y For the notebook personal computer Package y 48-pin plastic quad flat package with heat slug (QFP type) Type y Silicon monolithic BI-CMOS IC
Block Diagram (Application Circuit Example) Note) This circuit and these circuit constants show an example and do not guarantee the design as a mass-production set. 123 45 6789 1 0 1 1 1 2 36 35 34 33 32 31 30 29 28 27 26 25 Protector VCC_SPL 1 μF AGC DET AGCL GND_SPL VCC_SPR 1 μF VREFSP Protector AGCR RL = 4 Ω to 8 Ω GND_SPR 1 μF VSS 1 μF VCC_CP Charge Pump REG+_ 1 μF VCC_HP HP_INR HP_OUTR HP_OUTL HP_INL SP_OUTR RL = 4 Ω to 8 Ω SP_OUTL SP_INL SP_INR VCC 1 μF AGC Control ON/OFF ON Level Attack time Recovery time AGC_Lv1 AGC_Attack AGC_Recovery1 AGC_Recovery2 AGC_Lv2 Test2 Test3 Test4 1 μF 10 kΩ 10 kΩ 1 μF 820 pF 10 kΩ10 kΩ 820 pF 10 kΩ 20 kΩ 1 μF 20 kΩ 10 kΩ 1 μF +6 dB +6 dB VCC 3.3 V 1 μF VCC_SP 5.0 V GND_CP 0 dB 0 dB +14 dB +14 dB +14 dB +14 dB 0 dB 0 dB Test1 AGC_ON/OFF 1 μF N.C. HP_STBY2 HP_STBY1 SP_STBY2 SP_STBY1 HP STBY ON/OFF SP STBY ON/OFF N.C. 68 Ω 68 Ω
Pin Descriptions Power Supply for SP L-channel amp system Power supplyVCC_SPL19 Power Supply for SP R-channel amp system Power supplyVCC_SPR18 SP amp. R-channel output (−) OutputSP_OUTR–17 SP amp. R-channel output (−)OutputSP_OUTR–16 SP amp. R-channel output (+)OutputSP_OUTR+15 SP amp. R-channel output (+) OutputSP_OUTR+14 Ground for SP R-channel amp system GroundGND_SPR13 N.C.⎯N.C.12 AGC-recovery-time selectionInputAGC_Recovery211 AGC-recovery-time selectionInputAGC_Recovery110 The output terminal of SP input amp. R-channelOutputPREOUT_R9 The feedback terminal of SP input amp. R-channelInputSP_INR8 Power Supply VCC Terminal for testing (please connect to Ground) Ground The feedback terminal of SP input amp. L-channel The output terminal of SP input amp. L-channel Terminal of reference voltage for SP amp. Terminal for testing (please connect to Ground) N.C. Ground for SP L-channel amp system SP amp. L-channel output (+) SP amp. L-channel output (+) SP amp. L-channel output (−) SP amp. L-channel output (−) Ground AGC ON/OFF selection Terminal for testing (please connect to Ground) AGC-attack-time selection AGC-on-level selection Power Supply Ground Input Output Input Ground Output Output Output Output Ground Input Input Input AGC-on-level selection Power Supply for HP amp.
Description
AGC_ON/OFF6 Test15 AGC_Attack4 SP_OUTL+23 SP_OUTL+22 SP_OUTL–21 SP_OUTL–20 SP_INL29 PREOUT_L28 N.C.25 GND_SPL24 VCC32 Test331 GND30 AGC_Lv23 AGC_Lv12 VCC_HP1 Pin namePin No.
Pin Descriptions (continued) The feedback terminal of HP amp. R-channelInputHP_INR48 HP amp. R-channel outputOutputHP_OUTR47 GroundGroundGND46 HP amp. L-channel outputOutputHP_OUTL45 The feedback terminal of HP amp. L-channelInputHP_INL44 Negative Power Supply supplied from Charge pumpPower supplyVSS43 Charge pump outputOutputVSS_CP42 Capacitor Connect Terminal2 for Charge pumpOutputC241 Ground for Charge pumpGroundGND_CP40 Capacitor Connect Terminal1 for Charge pump Power Supply for Charge pump Terminal for testing (please connect to Ground) HP Standby On/Off control HP Standby On/Off control Output Power Supply Input Input SP Standby On/Off control SP Standby On/Off control VCC_CP38 Test437 HP_STBY236 HP_STBY135 SP_STBY234 SP_STBY133 Pin namePin No.
5.75VCC_SPL VCC_SPR A⎯ICCSupply current2 NoteUnitRatingSymbolParameterA No. °C−55 to +150TstgStorage temperature5 °C−30 to +75ToprOperating ambient temperature4 *2mW355PDPower dissipation3 *1V 5.75 VCC VCC_HP VCC_CPSupply voltage1 Note) *1: The values under the condition not exceeding the above absolute maximum ratings and the power dissipation. *2 : The power dissipation shown is the value at Ta = 75°C for the independent (unmounted) IC package with a heat sink. *3 : Except for the power dissipation, operating ambient temperature, and storage temperature, all ratings are for Ta = 25°C. NoteUnitRangeSymbolParameter V 4.5 to 5.5VCC_SPL VCC_SPR 3.0 to 5.5 VCC VCC_HP VCC_CPSupply voltage range Note) *: The values under the condition not exceeding the above absolute maximum ratings and the power dissipation. Absolute Maximum Ratings Operating Supply Voltage Range
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