Design Idea DI-134
PeakSwitch®
Audio Amplifier Power Supply
Application
Device
Power Output
Input Voltage
Output Voltage
Topology
Audio
PKS606P
20 W, 43 W peak
90-265 VAC
12 V
Flyback
Design Highlights
snubberꢀR7ꢀandꢀC11ꢀreduceꢀEMIꢀbyꢀdampingꢀhigh-frequencyꢀ
ringing.ꢀCapacitorꢀC4ꢀdecouplesꢀtheꢀBYPASSꢀ(BP)ꢀpinꢀofꢀ
U1,ꢀ whichꢀ isꢀ theꢀ IC’sꢀ internallyꢀ regulatedꢀ supplyꢀ node.ꢀ
Anꢀintegrated,ꢀhigh-voltageꢀcurrentꢀsourceꢀprovidesꢀinitialꢀ
operatingꢀpowerꢀtoꢀU1.ꢀAꢀbiasꢀwindingꢀonꢀT1ꢀ(pinsꢀ4ꢀandꢀ
5),ꢀD6,ꢀC5ꢀandꢀR3ꢀprovideꢀoperatingꢀcurrentꢀtoꢀU1,ꢀafterꢀ
initialꢀstartup.ꢀOutputꢀvoltageꢀfeedbackꢀisꢀcoupledꢀacrossꢀ
theꢀsafetyꢀisolationꢀbarrierꢀbyꢀU2.ꢀTransistorꢀQ1,ꢀC19,ꢀR14ꢀ
andꢀD9ꢀpreventꢀtheꢀhigh-frequencyꢀgainꢀlossꢀthatꢀtheꢀU2ꢀ
phototransistorꢀnormallyꢀexperiences,ꢀwhichꢀpreventsꢀgroupsꢀ
ofꢀenabledꢀandꢀdisabledꢀswitchingꢀcyclesꢀ(pulseꢀbunching).ꢀ
UsingꢀtheꢀsignalꢀonꢀtheꢀEN/UVꢀpin,ꢀtheꢀcontrollerꢀwithinꢀ
U1ꢀregulatesꢀtheꢀoutputꢀvoltageꢀbyꢀenablingꢀandꢀdisablingꢀ
MOSFETꢀswitchingꢀcycles.
•ꢀ Deliversꢀ>2Xꢀpeakꢀpowerꢀwithoutꢀoutputꢀdistortion
•ꢀ Universalꢀinputꢀvoltageꢀrangeꢀoperationꢀallowsꢀaꢀsingleꢀ
designꢀtoꢀbeꢀsoldꢀworldwide
•ꢀ Highꢀefficiencyꢀ(>79%)ꢀacrossꢀentireꢀinputꢀrange
•ꢀ MeetsꢀEN55022ꢀBꢀconductedꢀEMIꢀlimits
•ꢀ Auto-restartꢀfeatureꢀallowsꢀindefinitelyꢀshortedꢀoutput
•ꢀ Thermalꢀshutdownꢀprotectsꢀsupplyꢀandꢀamplifier
Operation
TheꢀisolatedꢀflybackꢀconverterꢀshownꢀinꢀFigureꢀ1ꢀwasꢀdesignedꢀ
aroundꢀaꢀmemberꢀofꢀtheꢀPeakSwitchꢀICꢀfamily,ꢀtheꢀPKS606Pꢀ
(U1).ꢀAꢀdeviceꢀinꢀtheꢀPꢀpackageꢀ(8-pinꢀDIP)ꢀwasꢀselectedꢀtoꢀ
minimizeꢀtheꢀcostꢀandꢀsizeꢀofꢀtheꢀheatsinkꢀrequiredꢀforꢀpeakꢀ
powerꢀdelivery.
Onꢀtheꢀsecondaryꢀsideꢀofꢀtheꢀisolationꢀbarrier,ꢀD7ꢀrectifiesꢀtheꢀ
outputꢀofꢀT1ꢀandꢀchargesꢀC7ꢀandꢀC16.ꢀTheꢀsnubberꢀcircuitꢀ
(R5ꢀandꢀC10)ꢀacrossꢀD7ꢀattenuatesꢀtheꢀhighꢀfrequencyꢀringꢀ
thatꢀoccursꢀwhenꢀD7ꢀturnsꢀoff.ꢀ
Theꢀinputꢀcircuitryꢀconsistsꢀofꢀaꢀfuseꢀ(F1)ꢀandꢀEMIꢀfilterꢀ
componentsꢀ(R6,ꢀC9,ꢀL8,ꢀL4,ꢀC12,ꢀR9,ꢀR8ꢀandꢀC13).ꢀTheꢀACꢀ
inputꢀisꢀrectifiedꢀ(D1–D4)ꢀandꢀfilteredꢀ(C2)ꢀandꢀconnectedꢀ
acrossꢀtheꢀprimaryꢀsideꢀpowerꢀcomponentsꢀ(T1ꢀandꢀU1).
Outputꢀvoltageꢀfeedbackꢀisꢀderivedꢀfromꢀtwoꢀseparateꢀcircuits.ꢀ
TheꢀcircuitꢀformedꢀbyꢀVR2,ꢀtheꢀLEDꢀinꢀU2,ꢀC19ꢀandꢀR16ꢀ
providesꢀtheꢀhighꢀfrequencyꢀ(HF)ꢀportionꢀofꢀtheꢀfeedbackꢀ
Duringꢀtheꢀflybackꢀportionꢀofꢀeachꢀswitchingꢀcycle,ꢀanꢀRCD-
Zenerꢀclampꢀcircuitꢀ(L2,ꢀD5,ꢀR7,ꢀC11ꢀandꢀVR1)ꢀprotectsꢀtheꢀ
MOSFETꢀ integratedꢀwithinꢀU1.ꢀ FerriteꢀbeadꢀL2,ꢀ andꢀRCꢀ
C10
1.2 nF
100 V
R5
10 Ω
1/2 W
C11
VR3
1N53538
16 V
VR2
1N5238B
8.7 V
470 pF
1 kV
EE25
T1
12 V, 1.7 A
3.6 A PK
9,10
2
3
C2
150 µF
400 V
D1-D4
1N4005
D7
SB580
R1
3.9 MΩ
1/8 W
VR1
P6KE200A
200 V
R10
2 kΩ
R7
C12
2.2 nF
1 kV
6,7,8
4
300 Ω
1/8 W
D5
1N4937
R9
3.3 Ω
1/8 W
R12
8.45 kΩ
1%
R4
5
L2
3.3 µH
3 A
1 kΩ
R11
1 kΩ
FB
U2A
PC817D
L4
5 mH
PeakSwitch
U1
PKS606P
C7
220 µF
25 V
C16
220 µF
25 V
R8
D6
C17
150 nF
50 V
22 Ω
1N4148
D
C6
1/2 W
R3
4.7 kΩ
EN/UV
2.2 nF
250 VAC
L8
1.8 µH
BP
C5
47 µF
35 V
S
C4
330 nF
50 V
R14
51 kΩ
C13
39 pF
1 kV
U2B
PC817D
C9
220 nF
275 VAC
Q1
2N3904
R15
R16
1 kΩ
20 Ω
C19
470 nF
50 V
R6
U3
TLV431
1/8 W
C18
6.8 nF
50 V
F1
2 A
R13
1 kΩ
1%
2.2 MΩ
1/8 W
D9
1N4148
RTN
PI-4580-022307
L
N
Figure 1. 20 W Continuous, 43 W Peak Audio Amplifier Power Supply, Designed Around a PKS606P Device.
February 2007
DI-134
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