phillips user-manual - um 10155
DESCRIPTION
Phillips user-manual for um10155TRANSCRIPT
UM10155Discrete Class D High Power Audio AmplifierRev. 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 mostimportant background information of the Philips Semiconductor DiscreteClass D High Power Audio Amplifier Demonstrator Board. With properheatsinking of the Power MOSFETs and a well dimensioned power supply,the PWM amplifier is capable of supplying 200 W of high quality audiopower into a 4 Ω loudspeaker.
Philips Semiconductors UM10155Discrete Class D High Power Audio Amplifier
Revision history
Rev Date Description
02 20060905 corrected Figure 9.
01 20060801 initial version
UM10155_2 © Koninklijke Philips Electronics N.V. 2006. All rights reserved.
User manual Rev. 02 — 5 September 2006 2 of 12
Contact informationFor additional information, please visit: http://www.semiconductors.philips.com
For sales office addresses, please send an email to: [email protected]
Philips Semiconductors UM10155Discrete Class D High Power Audio Amplifier
1. Introduction
The Universal Class D (UcD) version 1.00 demonstrator board implements a 200 W trueRMS (into a 4 Ω load) high quality audio power amplifier on a very compact printed-circuitboard. The amplifier is built-up of discrete components only, and makes use of Philipspatent WO 03/090343.
The demonstrator board is intended to illustrate the capability of Philips Power MOSFETsin discrete high-end PWM audio amplifier applications. The board is self-contained andonly requires a simple (non-stabilized) dual power supply, an audio source (e.g. functiongenerator, CD player) and a loudspeaker to demonstrate its capabilities. For evaluation athigh output power a provision is made to attach an appropriate heatsink to the MOSFETson the board.
Fig 1. General view
001aaf148
UM10155_2 © Koninklijke Philips Electronics N.V. 2006. All rights reserved.
User manual Rev. 02 — 5 September 2006 3 of 12
xxxx xxxxxxxxxxxxxxxxxxxxxxxxxxxxxx x xxxxxxxxxxxxxx xxxxxxxxxx xxx xxxxxx xxxxxxxxxxxxxxxxxxxxxxx xxxxxxxxxxxxxxxxxxxxxxxxxxx xxxxxx xx xxxxxxxxxxxxxxxxxxxxxxxxxxxxx xxxxxxxxxxxxxxxxxxxxxx xxxxxxxxxxx xxxxxxx xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx xxxxxxxxxxxxxx xxxxxx xx xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx xxxxxxxxxxxxxxxxxxxxxxxx xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx xxxxxxxxxxx xxxxx x x
UM
10155_2
User m
anual
Philips S
emiconduc
2.C
ircuit diagra
torsUM10155
Discrete C
lass D H
igh Pow
er Audio A
mplifier
m
001aaf149
C12100 nF
C1122 µF
C15680 nF
C16100 nF
C171000 µF
C13100 nF
C1422 µF
C18100 nF
C191000 µF
900 pF
240 Ω
J10
J11
J7
J8
J9
J5
J6
1000 pF
230 Ω
1
µH
© K
oninklijke Philips E
lectronics N.V. 2006. A
ll rights reserved.
Rev. 02 —
5 Septem
ber 20064 of 12 Fig 2. Circuit diagram
47 Ω
C3100 nF
C14.7 nF
C6100 nF
C5100 µF
C2100 nF
C1
C4220 pF
R3
560 Ω
R1
47 kΩ
R5
10 Ω
R29
10 Ω
R28
R8220 Ω
R7220 Ω
R647 kΩ
R111 kΩ
R132.2 kΩ R12
22 kΩ
R145.6 MΩ
R153.9 MΩ
R9330 Ω
R81 kΩ
R18390 Ω
R1
R260.05 Ω
R250.05 Ω
R164.7 kΩ
R21 kΩ
R10220 Ω
Q1
Q7
Q6
Q2
Q8
Q5
D1
1PS76SB10
D2
1PS76SB10
BF820
BC847
BF820
BF821
Q4BF721
Q12PBSS5140T
Q10BC857
BF821
Q14
D11
BAS316
D7
BAS321
D9
1PS76SB10
D8PDZ12B
D6BAS321
R20
27 Ω
PHP18NQ11T
Q3BC857
BC847
47 Ω
R4
J2
J1
J4
J3
C8100 nF
C7100 µF
C1
R211 kΩ
R17390 Ω
R1
Q11PBSS5140T
Q9BC857
Q15BF720
Q13
D12
BAS316
D10
1PS76SB10
D5PDZ12B
R19
27 Ω
L
28
R27
8.2 kΩ
PHP18NQ11T
Philips Semiconductors UM10155Discrete Class D High Power Audio Amplifier
3. Printed-circuit board layout
Table 1. Connections
Connector Function Remarks
J1 audio in - signal use together with J2
J2 audio in - ground 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 astabilized power supply)
J6 positive current sense can optionally be used in anovercurrent protection scheme
J7 power supply ground 0 V
J8 negative current sense can optionally be used in anovercurrent protection scheme
J9 negative supply voltage −30 V to −45 V (no need for astabilized power supply)
J10 loudspeaker output use together with J11
J11 loudspeaker ground use together with J10
Fig 3. Top copper layout Fig 4. Bottom copper layout
001aaf150 001aaf151
UM10155_2 © Koninklijke Philips Electronics N.V. 2006. All rights reserved.
User manual Rev. 02 — 5 September 2006 5 of 12
Philips Semiconductors UM10155Discrete Class D High Power Audio Amplifier
4. Specifications
4.1 Pop-less/click-less start-up and shutdownA provision has been added to the circuit to provide pop-less/click-less start-up andshutdown. To make use of the start-up facility, make sure that the supply power (pins J5and J9) is applied prior to enabling the amplifier (connecting J3 to J4). To benefit from thepop-less shutdown feature, disable the amplifier (disconnect J3 and J4) prior to removingthe supply power.
4.2 Overcurrent protectionA provision has been added to the circuit to monitor the current flowing through the PowerMOSFETs (Q13 and Q14). The voltage appearing between pins J5 and J6 is proportionalto the current in MOSFET Q14 (ratio: 50 mV/A) and the voltage between J8 and J9 isproportional to the current in MOSFET Q13 (ratio: 50 mV/A). With the use of an external
Fig 5. Component layout Fig 6. Top silk-screen
001aaf152 001aaf153
J3
J4
J5
J6
J10
J11
J8
J9
J7
J1
J2
C5
class D amp.version 1.00
internationalpatent
WO 03/090343
PHILIPS
Q14Q13
C7
+
+
+ +
+
+
C14
C11C17
C15
L1
C19
Table 2. Specifications
Symbol Parameter Conditions Value
VP supply voltage equal positive and negativesupply voltages
±30 V to ±45 V
PL output power VP = ±45 V; RL = 4 Ω;appropriate heatsink needed
200 W (RMS)
η efficiency PL = 100 W; RL = 4 Ω > 92 %
THD+N total harmonicdistortion-plus-noise
PL = 10 W; frequency rangefrom 20 Hz to 20 kHz
< 0.03 %
S/N signal-to-noise ratio > 120 dB
fPWM PWM frequency idle ~ 400 kHz
Voffset offset voltage DC value < 50 mV
UM10155_2 © Koninklijke Philips Electronics N.V. 2006. All rights reserved.
User manual Rev. 02 — 5 September 2006 6 of 12
Philips Semiconductors UM10155Discrete Class D High Power Audio Amplifier
circuit these two signals may be used to disable the amplifier (disconnect J3 and J4) incase of an overcurrent situation. Similarly the J3-J4 pin combination can be used todisable the amplifier in case of other fault conditions.
4.3 Important noticeThe ‘High Power Class D Audio Amplifier Demonstrator Board’ is meant to demonstratethe capabilities of the specific Class D Amplifier design and its semiconductorcomponents. No provisions for short-circuit and overcurrent protection were made on thedemonstrator board itself. Neither was an operating temperature compensation featureimplemented 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’ isnot intended to be used for long term operation or under extreme temperature conditionswhen delivering substantial output power.
5. Wiring diagram and powering-up
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
4 Ω to 8 Ω
10 mF 30 V to 45 V
10 mF 30 V to 45 V
001aaf154
J3
J4
J5
J6
J10
J11
J8
J9
J7
J1
J2signal
groundC5
class D amp.version 1.00
internationalpatent
WO 03/090343
PHILIPS
Q14Q13
C7
+
+
+ +
+
+
C14
C11C17
C15
L1
C19
UM10155_2 © Koninklijke Philips Electronics N.V. 2006. All rights reserved.
User manual Rev. 02 — 5 September 2006 7 of 12
Philips Semiconductors UM10155Discrete Class D High Power Audio Amplifier
6. Adding external features
6.1 Electronic enabling/disabling of the amplifier
Electronic enabling/disabling can be used for:
• Implementing pop-less and click-less start-up and shut-down
• 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 asBC846) and the resistor must limit the base current of the transistor to approximately1 mA (in case of logic level driving, that would mean R = 4.7 kΩ).
Enable signal:
(HIGH = enable)
(LOW = disable)
Fig 8. Enabling/disabling of the amplifier
001aaf155
J3
J4
J5
J6
J10
J11
J8
J9
J7
J1
J2
enablesignal
C5
class D amp.version 1.00
internationalpatent
WO 03/090343
PHILIPS
Q14Q13
C7
+
+
+ +
+
+
C14
C11C17
C15
L1
C19
UM10155_2 © Koninklijke Philips Electronics N.V. 2006. All rights reserved.
User manual Rev. 02 — 5 September 2006 8 of 12
Philips Semiconductors UM10155Discrete Class D High Power Audio Amplifier
6.2 Short-circuit and overcurrent protection
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 isdetected in either the low side MOSFET (Q13 on the Demonstrator Board) and high sideMOSFET (Q14 on the Demonstrator Board) respectively. The two signals are combinedthrough the IC3 OR-gate. The resulting signal must be processed in the ‘µP or other logic’block. One of the simplest solutions would be a latch circuit, which on a high pulse forcesthe output go low. This causes the ‘Electronic enabling/disabling circuit’ to disable theamplifier. Through manual intervention and/or after a certain while, the latch should bereset to a HIGH logic level, which in turn re-enables the amplifier.
Fig 9. Short-circuit and overcurrent protection
001aaf156
J3
J4
J5
J6
J10
J11
J8
J9
J7
J1
J2 C5
class D amp.version 1.00
internationalpatent
WO 03/090343
PHILIPS
Q14Q13
C7
+
+
+ +
+
+
C14
C11C17
C15
R4R3
R6
R5
R8
R9
D1 D3
R12
D6
R7
D2
R11
D4
R10
IC1
IC3
IC2
D5
Q1
Q2
C2
R1
R2 C1
L1
C19
µP OROTHERLOGIC
to enabling/disabling circuit
Table 3. Components
Component Value
R1, R4 270 Ω
R2, R3 4.7 kΩ
R5, R6, R7, R8, R9, R10, R11, R12 10 kΩ
C1, C2 4.7 nF
D1, D5 Philips PDZ10B
D2, D3, D4, D6 Philips PDZ5.1B
Q1 Philips BC846
Q2 Philips BC856
IC1, IC2 Fast operational amplifier; feed with +12 V and−12 V supplies
IC3 Philips HEF4071; feed with 5 V
UM10155_2 © Koninklijke Philips Electronics N.V. 2006. All rights reserved.
User manual Rev. 02 — 5 September 2006 9 of 12
Philips Semiconductors UM10155Discrete Class D High Power Audio Amplifier
6.3 Sonic performance versus Efficiency trade-offThe dead-time that is allowed between Q13 and Q14 conduction determines theefficiency of the Demonstrator Board for a great deal; a long dead-time leads to betterefficiency. On the other side, long dead-time also leads to worse sonic performance; it hasimportant adverse consequences for e.g. THD.
Short dead-time causes quiescent current to go up, thus reducing efficiency andimproving sonic performance. The higher quiescent current is the result of morecross-conduction of Q13 and Q14. So, most of the power that is lost in this way isdissipated in Q13 and Q14, which may heat-up excessively. This may cause thermallyinstable behavior of the MOSFETs. For that reason, the Demonstrator Board is shipped inlow quiescent current mode – during initial evaluation the risk of damaging the MOSFETsthrough thermal runaway is thus reduced.
Nevertheless, by modifying one resistor value, the dead-time can be shortened andevaluation in enhanced sonic performance mode can take place. Changing R9 to a lowervalue decreases dead-time. It is left the responsibility of the experimenter to preventthermal runaway, but assistance from Philips will be available through the local salesrepresentatives.
To reduce the risk of thermal runaway in the enhanced sonic performance mode, athermal feedback loop can be implemented: the operating temperature of the MOSFETscan be fed-back to the dead-time control by changing the fixed R9 value, mounting a PTCresistor 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 fromPhilips will be available through the local sales representatives.
UM10155_2 © Koninklijke Philips Electronics N.V. 2006. All rights reserved.
User manual Rev. 02 — 5 September 2006 10 of 12
Philips Semiconductors UM10155Discrete Class D High Power Audio Amplifier
7. Legal information
7.1 Definitions
Draft — The document is a draft version only. The content is still underinternal review and subject to formal approval, which may result inmodifications or additions. Philips Semiconductors does not give anyrepresentations or warranties as to the accuracy or completeness ofinformation included herein and shall have no liability for the consequences ofuse of such information.
7.2 Disclaimers
General — Information in this document is believed to be accurate andreliable. However, Philips Semiconductors does not give any representationsor warranties, expressed or implied, as to the accuracy or completeness ofsuch information and shall have no liability for the consequences of use ofsuch information.
Right to make changes — Philips Semiconductors reserves the right tomake changes to information published in this document, including withoutlimitation specifications and product descriptions, at any time and withoutnotice. This document supersedes and replaces all information supplied priorto 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
malfunction of a Philips Semiconductors product can reasonably be expectedto result in personal injury, death or severe property or environmentaldamage. Philips Semiconductors accepts no liability for inclusion and/or useof Philips Semiconductors products in such equipment or applications andtherefore such inclusion and/or use is at the customer’s own risk.
Applications — Applications that are described herein for any of theseproducts are for illustrative purposes only. Philips Semiconductors makes norepresentation or warranty that such applications will be suitable for thespecified use without further testing or modification.
7.3 PatentsNotice is herewith given that the subject device uses one or more of thefollowing patents and that each of these patents may have correspondingpatents in other jurisdictions.
WO 03/090343 — owned by Koninklijke Philips Electronics N.V. (int. patentapplication)
7.4 TrademarksNotice: All referenced brands, product names, service names and trademarksare the property of their respective owners.
UM10155_2 © Koninklijke Philips Electronics N.V. 2006. All rights reserved.
User manual Rev. 02 — 5 September 2006 11 of 12
Philips Semiconductors UM10155Discrete Class D High Power Audio Amplifier
8. Contents
1 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32 Circuit diagram. . . . . . . . . . . . . . . . . . . . . . . . . . 43 Printed-circuit board layout . . . . . . . . . . . . . . . 54 Specifications. . . . . . . . . . . . . . . . . . . . . . . . . . . 64.1 Pop-less/click-less start-up and shutdown . . . . 64.2 Overcurrent protection . . . . . . . . . . . . . . . . . . . 64.3 Important notice . . . . . . . . . . . . . . . . . . . . . . . . 75 Wiring diagram and powering-up. . . . . . . . . . . 76 Adding external features. . . . . . . . . . . . . . . . . . 86.1 Electronic enabling/disabling of the amplifier . . 86.2 Short-circuit and overcurrent protection . . . . . . 96.3 Sonic performance versus Efficiency trade-off 107 Legal information. . . . . . . . . . . . . . . . . . . . . . . 117.1 Definitions . . . . . . . . . . . . . . . . . . . . . . . . . . . . 117.2 Disclaimers . . . . . . . . . . . . . . . . . . . . . . . . . . . 117.3 Patents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 117.4 Trademarks . . . . . . . . . . . . . . . . . . . . . . . . . . . 118 Contents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
© 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: [email protected].
Date of release: 5 September 2006
Document identifier: UM10155_2
Please be aware that important notices concerning this document and the product(s)described herein, have been included in section ‘Legal information’.