UM10155 Discrete Class D High Power Audio Amplifier
Contents
1. C19 001aaf156 Fig 9 Short circuit and overcurrent protection UM10155 2 The Short circuit and overcurrent protection circuit must be used together with the Electronic enabling disabling circuit The output pins of IC1 and IC2 produce a HIGH logic level pulse when overcurrent is detected in either the low side MOSFET Q13 on the Demonstrator Board and high side MOSFET Q14 on the Demonstrator Board respectively The two signals are combined through the IC3 OR gate The resulting signal must be processed in the uP or other logic block One of the simplest solutions would be a latch circuit which on a high pulse forces the output go low This causes the Electronic enabling disabling circuit to disable the amplifier Through manual intervention and or after a certain while the latch should be reset to a HIGH logic level which in turn re enables the amplifier Table 3 Components Component Value R1 R4 270 Q R2 R8 4 7 kQ R5 R6 R7 R8 R9 R10 R11 R12 10 KQ C1 C2 4 7 nF D1 D5 Philips PDZ10B D2 D3 D4 D6 Philips PDZ5 1B Q1 Philips BC846 MM Q2 Philips BC856 IC1 IC2 Fast operational amplifier feed with 412 V and 12 V supplies ca Philips HEF4071 feed with 5 V Koninklijke Philips Electronics N V 2006 All rights reserved User manual2. Rev 02 5 September 2006 9 of 12 Philips Semiconductors UM1 01 55 UM10155_2 Discrete Class D High Power Audio Amplifier 6 3 Sonic performance versus Efficiency trade off The dead time that is allowed between Q13 and Q14 conduction determines the efficiency of the Demonstrator Board for a great deal a long dead time leads to better efficiency On the other side long dead time also leads to worse sonic performance it has important adverse consequences for e g THD Short dead time causes quiescent current to go up thus reducing efficiency and improving sonic performance The higher quiescent current is the result of more cross conduction of Q13 and Q14 So most of the power that is lost in this way is dissipated in Q13 and Q14 which may heat up excessively This may cause thermally instable behavior of the MOSFETs For that reason the Demonstrator Board is shipped in low quiescent current mode during initial evaluation the risk of damaging the MOSFETs through thermal runaway is thus reduced Nevertheless by modifying one resistor value the dead time can be shortened and evaluation in enhanced sonic performance mode can take place Changing R9 to a lower value decreases dead time It is left the responsibility of the experimenter to prevent thermal runaway but assistance from Philips will be available through the local sales representatives To reduce the risk of thermal runaway in the enhanced sonic performance mode
3. can optionally be used in an overcurrent protection scheme J7 power supply ground 0v J8 negative current sense can optionally be used in an overcurrent protection scheme J9 negative supply voltage 30 V to 45 V no need for a stabilized power supply J10 loudspeaker output use together with J11 J11 loudspeaker ground use together with J10 3 Printed circuit board layout Fig 3 Top copper layout 001aaf150 001aaf151 Fig 4 Bottom copper layout UM10155 2 Koninklijke Philips Electronics N V 2006 All rights reserved User manual Rev 02 5 September 2006 5 of 12 Philips Semiconductors UM10155 Discrete Class D High Power Audio Amplifier mar pa LIIS K r 4 PHILIPS My class D amp version 1 00 O c11 international C14 patent WO 03 090343 L 4 001aaf152 001aaf153 Fig 5 Component layout Fig 6 Top silk screen 4 Specifications Table 2 Specifications Symbol Parameter Conditions Value Vp supply voltage equal positive and negative 30 V to 45 V supply voltages PL output power Vp 45 V RL 4 Q 200 W RMS appropriate heatsink needed n efficiency P 100 W Rp 4Q gt 92 THD N total harmonic P 10 W frequency range lt 0 03 distortion plus noise f
4. f o3 22k0 R12 D6 Lcos Los R18 f I I I 45 BC857 22 kQ BAS321 T 100 pF T 100 nF 390 Q C12 C11 C16 C17 R5 Q4 C4 D8 m Q14 T 100 nF T 22 uF I 100 nF T 1000 uF J3 Ud En 220 pF PDZ12B R24 m R20 Pl 100 d co m R14 1PS76SB10 BAS316 100 pF B Bree P3 P BFe21 5 6 MQ PHP18NQ11T P Ji Q 472 479 a8 __ Q12 p 5600 I PBSS5140T p Ci R2 D1 R15 n8 4 7nF 1k2 4 d 4 39M2 nt TG ds 1PS76SB10 1 I Lt mn D2 t Donne J10 D7 28 uH 77 s 1PS76SB10 Pl T Sao nF Bass21 cz Lg R17 T 100 uF T 100 nF 390 0 T 3 jji Q9 Q13 BC857 R23 m D10 Ri9 D12 100 K Pt Lco 1PS76SB10 27 BAS316 100 pF ais PHP18NQ11T BF720 t J7 R27 Q11 4 PBSS5140T 82k0 C13 C14 C18 C19 D5 LI e p m PDZ12B C3 R8 R9 R10 J8 T 100 nF 2200 330 Q 2200 R25 Eos 0 050 J9 10Q 001aaf149 Fig 2 Circuit diagram ureJDeip yna 4 dwy oipny 13M0d ufiH a sse 3S1 SSLOLINN SIOJONPUODIWIIS Sdijiud Philips Semiconductors UM10155 Table 1 Connections Discrete Class D High Power Audio Amplifier Connector J1 J2 Function audio in signal audio in ground Remarks use together with J2 use together with J1 J3 amplifier enable when connected to ground J4 the amplifier is enabled J4 ground use together with J3 J5 positive supply voltage 30 V to 45 V no need for a stabilized power supply J6 positive current sense
5. UM10155 Discrete Class D High Power Audio Amplifier Rev 02 5 September 2006 User manual Document information Info Content Keywords Class D Audio Amplifier Universal Class D UcD PWM Audio Amplifier High Power Audio Abstract This user manual describes the operating instructions and the most important background information of the Philips Semiconductor Discrete Class D High Power Audio Amplifier Demonstrator Board With proper heatsinking of the Power MOSFETs and a well dimensioned power supply the PWM amplifier is capable of supplying 200 W of high quality audio power into a 4 Q loudspeaker PHILIPS Philips Semiconductors UM1 01 55 Discrete Class D High Power Audio Amplifier Revision history Rev Date Description 02 20060905 corrected Figure 9 01 20060801 initial version Contact information For additional information please visit http www semiconductors philips com For sales office addresses please send an email to sales addresses www semiconductors philips com UM10155 2 Koninklijke Philips Electronics N V 2006 All rights reserved User manual Rev 02 5 September 2006 2 of 12 Philips Semiconductors UM1 01 55 Discrete Class D High Power Audio Amplifier 1 Introduction UM10155_2 The Universal Class D UcD version 1 00 demonstrator board implements a 200 W true RMS into a 4 Q load high quality audio power amplifier on a very compact printed circuit boa
6. a thermal feedback loop can be implemented the operating temperature of the MOSFETs can be fed back to the dead time control by changing the fixed R9 value mounting a PTC resistor on the heatsink of the MOSFETs and connecting the PTC in parallel with R9 Again any changes are left the responsibility of the experimenter but assistance from Philips will be available through the local sales representatives Koninklijke Philips Electronics N V 2006 All rights reserved User manual Rev 02 5 September 2006 10 of 12 Philips Semiconductors UM10155 7 Legal information 7 1 Definitions Draft The document is a draft version only The content is still under internal review and subject to formal approval which may result in modifications or additions Philips Semiconductors does not give any representations or warranties as to the accuracy or completeness of information included herein and shall have no liability for the consequences of use of such information 7 2 Disclaimers General Information in this document is believed to be accurate and reliable However Philips Semiconductors does not give any representations or warranties expressed or implied as to the accuracy or completeness of such information and shall have no liability for the consequences of use of such information Right to make changes Philips Semiconductors reserves the right to make changes to information published in this document incl
7. ervice names and trademarks are the property of their respective owners Koninklijke Philips Electronics N V 2006 All rights reserved User manual Rev 02 5 September 2006 11 of 12 Philips Semiconductors UM1 01 55 Discrete Class D High Power Audio Amplifier 8 Contents 1 Introduction 2 0 e eee eee eee 3 2 Circuit diagram 0 eee eee eee 4 3 Printed circuit board layout 5 4 Specifications 2660 nel pr mns 6 4 1 Pop less click less start up and shutdown 6 4 2 Overcurrent protection 6 4 3 Important notice 0 eee eee 7 5 Wiring diagram and powering up 7 6 Adding external features 8 6 1 Electronic enabling disabling of the amplifier 8 6 2 Short circuit and overcurrent protection 9 6 3 Sonic performance versus Efficiency trade off 10 7 Legal information sesse 11 7 1 Definitlons creek REG Lud 11 7 2 DisclaiMErS dess scsi creuant einemi orae 11 7 3 Patents xis nanan ues tex x RE dE 11 7 4 Trademarks nuaa nananana 11 8 Contents Rp 9E a 12 Please be aware that important notices concerning this document and the product s described herein have been included in section Legal information PHILIPS Koninklijke Philips Electronics N V 2006 All rights reserved For more information please visit http www semiconductors philips com For sales office addresses email to sa
8. les addresses www semiconductors philips com Date of release 5 September 2006 Document identifier UM10155 2
9. onstrator Board is meant to demonstrate the capabilities of the specific Class D Amplifier design and its semiconductor components No provisions for short circuit and overcurrent protection were made on the demonstrator board itself Neither was an operating temperature compensation feature implemented on the board The circuit on the board is reduced to its essentials In this implementation the High Power Class D Audio Amplifier Demonstrator Board is not intended to be used for long term operation or under extreme temperature conditions when delivering substantial output power 5 Wiring diagram and powering up UM10155 2 PHILIPS gt class D amp version 1 00 J3 J5 A _ J4 J6 _ O P mm ai C11 signal P ys L Z 10mF 30Vto45V ground Tors 401080 L1 1 Z ois 914 a J11 7 Q 7 _ T M 5 9 8 oy gt O J8 10mF 30Vto45V v international C14 J9 patent WO 03 090343 en 001aaf154 Audio input J1 is signal J2 is ground Initially leave J6 and J8 unconnected J7 and J11 are at the same ground potential Fig 7 Wiring diagram Koninklijke Philips Electronics N V 2006 All rights reserved User manual Rev 02 5 September 2006 7 of 12 Philips Semiconductors UM1 01 55 Discrete Class D High Power Audio Amplifier 6 Adding external feat
10. rd The amplifier is built up of discrete components only and makes use of Philips patent WO 03 090343 PHILIPS Ph ass D om Internat potent 001aaf148 Fig 1 General view The demonstrator board is intended to illustrate the capability of Philips Power MOSFETs in discrete high end PWM audio amplifier applications The board is self contained and only requires a simple non stabilized dual power supply an audio source e g function generator CD player and a loudspeaker to demonstrate its capabilities For evaluation at high output power a provision is made to attach an appropriate heatsink to the MOSFETs on the board Koninklijke Philips Electronics N V 2006 All rights reserved User manual Rev 02 5 September 2006 3 of 12 9002 1equiejdes c Z0 ed jenuew sasn cL sO Z SSLOLWN pamasa SUDU Ily 9002 A N 91U01193 3 sdijiug exfipuruoy R29 J5 100 dt R16 A ce R6 R7 4 7 kQ 0 05 2 T 100 nF 47 KQ 2200 i R13 i
11. rom 20 Hz to 20 kHz S N signal to noise ratio gt 120 dB fPwM PWM frequency idle 400 kHz Vottset offset voltage DC value 50mV UM10155 2 4 1 4 2 Pop less click less start up and shutdown A provision has been added to the circuit to provide pop less click less start up and shutdown To make use of the start up facility make sure that the supply power pins J5 and J9 is applied prior to enabling the amplifier connecting J3 to J4 To benefit from the pop less shutdown feature disable the amplifier disconnect J3 and J4 prior to removing the supply power Overcurrent protection A provision has been added to the circuit to monitor the current flowing through the Power MOSFETs Q13 and Q14 The voltage appearing between pins J5 and J6 is proportional to the current in MOSFET Q14 ratio 50 mV A and the voltage between J8 and J9 is proportional to the current in MOSFET Q13 ratio 50 mV A With the use of an external Koninklijke Philips Electronics N V 2006 All rights reserved User manual Rev 02 5 September 2006 6 of 12 Philips Semiconductors UM1 01 55 4 3 Discrete Class D High Power Audio Amplifier circuit these two signals may be used to disable the amplifier disconnect J3 and J4 in case of an overcurrent situation Similarly the J3 J4 pin combination can be used to disable the amplifier in case of other fault conditions Important notice The High Power Class D Audio Amplifier Dem
12. uding without limitation specifications and product descriptions at any time and without notice This document supersedes and replaces all information supplied prior to the publication hereof Suitability for use Philips Semiconductors products are not designed authorized or warranted to be suitable for use in medical military aircraft space or life support equipment nor in applications where failure or UM10155_2 Discrete Class D High Power Audio Amplifier malfunction of a Philips Semiconductors product can reasonably be expected to result in personal injury death or severe property or environmental damage Philips Semiconductors accepts no liability for inclusion and or use of Philips Semiconductors products in such equipment or applications and therefore such inclusion and or use is at the customer s own risk Applications Applications that are described herein for any of these products are for illustrative purposes only Philips Semiconductors makes no representation or warranty that such applications will be suitable for the specified use without further testing or modification 7 3 Patents Notice is herewith given that the subject device uses one or more of the following patents and that each of these patents may have corresponding patents in other jurisdictions WO 03 090343 owned by Koninklijke Philips Electronics N V int patent application 7 4 Trademarks Notice All referenced brands product names s
13. ures 6 1 Electronic enabling disabling of the amplifier PHILIPS class D amp version 1 00 J3 J5 7 i enable N O signal Ji Y C17 gt BB C11 J2 C5 I d L zs L1 ois 914 A J7 A c7 O international C14 9 patent WO 03 090343 E 001aaf155 Enable signal HIGH enable LOW disable Fig 8 Enabling disabling of the amplifier Electronic enabling disabling can be used for Implementing pop less and click less start up and shut down e Shutting down the amplifier in case of a failure condition short circuit overcurrent over temperature The transistor in the enabling disabling circuit must be low current 60 V type such as BC846 and the resistor must limit the base current of the transistor to approximately 1 mA in case of logic level driving that would mean R 4 7 kQ UM10155 2 Koninklijke Philips Electronics N V 2006 All rights reserved User manual Rev 02 5 September 2006 8 of 12 Philips Semiconductors UM10155 Discrete Class D High Power Audio Amplifier 6 2 Short circuit and overcurrent protection J3 J4 J1 J2 DOON international C14 s m D r L3 vV R3 C2 m Je R4 T U D6 2 c SBF 11 cay R11 a L 3 m Tors uP OR R6 OTHER Qi4 M J10 LOGIC _ 11 E F D2 fo enabling J7 R5 7 disabling circuit v R7 IC1 R9 T 3 H C P E RI Ko D1 1 z t J9 R2 Le E R8 o T gi R10 IC2 R12
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