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REFERENCE DESIGN
IRAUDAMP1 revB
USA
International Rectifier * 233 Kansas Street, El Segundo, CA 90245
High Power Class D Audio Power Amplifier using IR2011S
IRAUDAMP1 revB
High Power Class D Audio Power Amplifier using IR2011S
Features
Complete Analog Input Class D Audio Power Amplifier 500W + 500W Peak Stereo (2CH) Output THD+N=0.008% @1kHz, 100W, 4 High Efficiency 93% @350W, 1kHz, 4 Simple Self Oscillating Half-Bridge Topology Includes all Local House-keeping Power Supplies Protection Functions Wide Operating Supply Voltage Range 25 ~ 60V Immune to Power Supply Fluctuations
Description
The IRAUDAMP1 is an example of a simple complete class D audio power amplifier design using the IR2011S, high speed high voltage gate driver IC. The design contains protection functions and house keeping power supplies for ease of use. This reference design is intended to demonstrate how to use the IR2011S, implement protection circuits, and design an optimum PCB layout.
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Specifications
Vcc=50V, RL = 4 unless otherwise noted.
Output Stage Topology Modulator IR Devices Used Switching Frequency Rated Output Power
Half Bridge Self Oscillating, 2nd order Sigma-Delta Modulation, Analog Input IR2011S Gate Driver IRFB23N15D MOSFET 400kHz (Adjustable) 250W + 250W 350W + 350W 370W + 370W (Peak Power) 500W + 500W (Peak Power) 0.008% 93% 115dB 200 3Hz ~ 40kHz (-3dB) 100dB 80dB 4 50V, (operational 25V ~ 60V) +75mA, -125mA 4.0"(W) x 5.5"(D) x 1.5"(H)
THD+N Efficiency S/N Damping Factor Frequency Response Channel Separation Minimum Load Impedance Power Supply Quiescent Current Dimensions
No signal 1kHz, THD=1.0% 1kHz, THD=10% 1kHz, THD=1.0%, 60V 1kHz, THD=10%, 60V 1kHz, 100W, AES-17 LPF 1kHz, 350W, Class D stage IHF-A Weighted, BW=20kHz 8, 1KHz 100Hz 10kHz
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Instructions
Connection Diagram
A typical test setup is shown in Fig.1.
Fig.1 Test Setup
Pin Description J1 CH-1 IN J2 CH-2 IN J3 POWER J5 CH-1 OUT J6 CH-2 OUT
Analog input for CH-1 Analog input for CH-2 Positive and negative supply Output for CH-1 Output for CH-2
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Resetting Protection
1. 2. 3. 4. Turn off 50V at the same time Wait until supply voltage drops to less than 5V Apply 50V at the same time Apply audio signal
Power Supply
The IRAUDAMP1 requires a pair of symmetric dual power supplies ranging from 25V to 60V. A regulated power supply is preferable for performance measurements, but not always necessary. The bus capacitor, C38-41 on the board along with high frequency bypass C31, C32, C35, and C36; are designed to take care only of the high frequency ripple current components from the switching action. A set of bus capacitors having enough capacitance to handle the audio ripple current must be placed outside the board if an unregulated power supply is used.
Bus Pumping
Since the IRAUDAMP1 is a half bridge configuration, the bus pumping phenomenon occurs when the amplifier outputs low frequency signal is below 100Hz. The bus pumping phenomenon is unavoidable; significant bus voltage fluctuations caused by a reverse energy flow coming back to the power supply from the class D amplifier. This might cause an unacceptable instablility condition in the feedback system of a power supply. The bus pumping becomes worse in the following conditions. - lower the output frequency - lower the load impedance - higher the output voltage - smaller the bus capacitance in bus capacitors If the bus voltage become too high or too low, the IRAUDAMP1 will shutdown the switching operation, and remain in the off condition until resetting the protection using the method described above. One of the easiest countermeasures is to drive both of the channels out of phase so that the reverse energy from one channel is consumed by the other, and does not return to the power supply.
Input Audio Signal
A proper input signal is an analog signal below 20kHz, up to 5Vrms, having a source impedance of less than 600 . A 30-60KHz input signal can cause LC resonance in the output LPF, resulting in an abnormally large amount of reactive current flowing through the switching stage. The IRAUDAMP1 has a C-R network to dump the resonant energy and protect the board in such a condition. However, these sub-sonic input frequencies should be avoided.
Load Impedance
The IRAUDAMP1 is designed for a load impedance of 4 and larger. The frequency response will have a small peak at the corner frequency of the output LC LPF if the loading impedance is higher than 4. The IRAUDAMP1 is stable with capacitive loading, however, it should be realized that the frequency response will be degraded by a heavy capacitive loading of more than 0.1F.
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Adjustments of DC offset and Switching Frequency
Component Number R10 R26 R22 R27 Adjustment DC offset for CH-1 Switching Frequency for CH-1 DC offset for CH-2 Switching Frequency for CH-2
Adjustments have to be done at an idling condition with no signal input. Note: The PWM switching frequency in this type of self oscillating scheme greatly impacts the audio performances, especially in the case where two or more channels are in close proximity.
Thermal Considerations
The IRAUDAMP1 unitlizes a relatively thick aluminum block heatsink for peak power output handling capabilities. It can handle continuous 1/8 of the rated power, which is generally considered to be a normal operating condition in safety standards, for a considerable length of time such as one hour. The size of the heatsink, however, is not sufficient to handle continuous rated power. Fig.2 shows the relationship between total power dissipation and temperature rise at equilibrium. If testing requires running conditions with continuous power a higher than 1/8 of the rated power, then, attach extensions to the top of the heatsink using three M4 screw taps prepared for this purpose. Please note that the heatsink is electrically connected to the GND pin.
60.00 Heatsink Temperature Delta (C) Ta=25 degC 50.00 40.00 30.00 20.00 10.00 0.00 0.00
2.00
4.00
6.00
8.00
10.00
Total Pow er (W)
Fig.2 Heatsink Thermal Characteristic at Equilibrium
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Functional Description
Feed back
+V C C
++
Integrator LT1220
Level Shifter 2N5401
IR2011S Gate Driver
LPF
GND
Comparator 74HC04
IRFB23N15
-V C C D
-VCC Fig. 3 Simplified Block Diagram of Amplifier
Self Oscillating PWM modulator The IRAUDAMP1 class D audio power amplifier is based on a self oscillating type PWM modulator for the lowest component count and a robust design. This topology is basically an analog version of a 2nd order sigma delta modulation having a class D switching stage inside the loop. The benefit of the sigma delta modulation in comparison to the carrier signal based modulator is that all the error in the audible frequency range is shifted away into the inaudible upper frequency range by nature of its operation, and it can apply a sufficient amount of correction. Another important benefit of the selfoscillating modulator is that it will cease operation if something interrupts the oscillating sequences. This is generally beneficial in a class D application because it makes the amplifier more robust.
Looking at CH-1 as an example, OP amp U1 forms a front end 2nd order integrator with C17 & C18. This integrator receives a rectangular waveform from the class D switching stage and outputs a quadratic oscillatory waveform as a carrier signal. To create the modulated PWM, the input signal shifts the average value of this quadratic waveform, through R10, so that the duty varies according to the instantaneous value of the analog input signal. The level shift transistor Q1 converts the carrier signal from a voltage form into a current form and sends it to the logic gates sitting on the negative DC bus via the level shift resistor R44, which conerts the signal back into a voltage form. The signal is then quantized by the threshold of the CMOS inverter gate U2. The PWM signal out of the inverter is split into two signals, with opposite polarity, one for high side MOSFET drive signal, the other for the low side MOSFET drive signal. The dual AND gates of U4 are used to implement the shutdown function, a high shutdown signal will ensure the outputs of the AND gates are low which in turn ensures the inputs to the gate driver are low.
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Under normal conditions the SD signal is low and the drive signal are passed directly through the AND gates to the IR2011S gate driver. The IR2011 drives two IRFB23N15D MOSFETs in the power stage to provide the amplified Digital PWM waveform. The amplified analog output is recreated by demodulating the amplified PWM . This is done by means of the LC Low Pass Filter formed by L1 and C51, which filters out the class D switching signal .
Switching Frequency
The self oscillating frequency is determined by the total delay time inside the loop. The following parameters affect the frequency. - Delay time in logic circuits - The gate driver propagation delay - MOSFET switching speed - Integration time constant in the front end integrator, e.g. R1, R23, R26, C17, and C18 for CH-1. - Supply Voltages
Gate Driver
The IRAUDAMP1 uses the IR2011S gate driver IC which is suitable for high speed, high speed switching applications up to 200V. In this design, the difference between ton and toff is used to generate a dead-time (a blanking time in between the on state of the two MOSFETs). Because of this, there is no gate timing adjustment on the board.
MOSFET Gate Resistor
In order to add a little more dead-time and compensate for the finite switching transient time in the MOSFET, a schottky diode is added in parallel with the gate resistor. The gate resistor (R31 and R50 in CH-1) adds about 10nS of delay time at turn on by limiting the gate charging current to the IRFB23N15D. The schottky diode bypasses the gate resistor in the gate discharge path, so that there is no falling edge delay. The delay at the rising edge adds dead time.
Startup Circuit
A self oscillating scheme contains class D switching stage that requires a start-up triggering signal to charge the high side bootstrap capacitor . The starter circuits, Q9 and Q10, detect the rising edge of -Vcc and turn the low side MOSFETs on for about 200mS to charge the bootstrap capacitors C23 and C24, then release the loop allowing the oscillation to start.
Housekeeping Voltage Regulators
The IRAUDAMP1 contains following regulators to accommodate all the necessary functions on the board. Regulator Component # Usage +5V Q18 OP Amps in the modulator -5V Q17 OP Amps in the modulator, Startup circuit -Vcc+5V U13, U14 Logic ICs -Vcc+12V U11 Gate driver IC, Protection circuits
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Protection
The IRAUDAMP1 includes protection features for overvoltage (OVP), overcurrent (OCP), and DC current protection. All of the protection uses OR logic so that any of the protection features when activated will disengage the output relay to cut off the load and protect the speakers. OCP and OVP functions are latched, DC protection is unlatched. To reset the protection, the bus voltage has to be reset to zero volts before re-applying power. The protection circuitry will also shutdown the amplifier if a fault condition is detected.
Fig.4 Functional Block Diagram of Protection DC protection
DC voltage output protection is provided to protect the speakers from DC current. This abnormal condition occurs only when the power amplifier fails and one of the MOSFETs remains in the ON state. DC protection is activated if the output has more than 3V DC offset. DC protection is unltached, and the amplifier will resume normal operation about 2 seconds after a fault condition has been removed.
Over Current Protection
Over Current Protection will activate and shut down the entire amplifier if the amount of current sensed at the positive power supply in either channel exceeds the preset value. If an overcurrent condition occurs, the voltage generated across a shunt resistor turns on the OCP detection transistors, Q2 and Q4 to send a signal to the protection logic.
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Over Voltage Protection
Over Voltage Protection shuts down the amplifier if the bus voltage between -Vcc and +Vcc exceeds 126V, the threshold is determined by the sum of the zener voltages of Z1, Z2, and Z3. OVP protects the board from the bus pumping phenomena which occurs at very low audio signal frequencies by shutting down the amplifier.
Power On/Off Sequence Timing
The IRAUDAMP1 is a robust design that can handle any power up/down sequence. However, symmetrical power up is recommended to properly initiate the self oscillation. In order for the unit to startup correctly, the negative power supply has to be initialized from zero volts. Fig.5 shows a preferred power up sequence. At start-up, a DC output voltage appears at the output of the LPF due to the charging of the bootstrap capacitors. To avoid this unwanted DC output signal being to fed to the load, the output relay RLY1 engages approximately 2 seconds after the startup condition is completed. Fig 6 below shows the start-up timing with the audio output not being activated until approximately 2 seconds after the power supplies are stable and the amplifier has reached steady state operation.
Fig.5 Start-up Timing (BLU: Switching, RED: Audio Output)
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Typical Performance
Vcc=50V, RL = 4 unless otherwise noted.
International Rectifier A-A FREQUENCY RESPONSE 02/25/04 10:06:24
International Rectifier A-A CROSSTALK or SEPARATION vs FREQUENCY 02/25/04 17:05:17
+2 +0 -2 d B V -4 -6
+0 -20 -40 -60 d B -80 -100
-8 -10 20
-120
50
100
200
500
1k
2k Hz
5k
10k
20k
50k
200k
-140 20 50 100 200 500 Hz 1k 2k 5k 10k 20k
Sweep 1 1 2 2
Trace 1 2 1 2
Color Blue Cyan Red Green
Line Style Solid Solid Solid Solid
Thick 1 1 1 1
Data Anlr.Ampl!Normalize Anlr.Level B!Normalize Anlr.Ampl!Normalize Anlr.Level B!Normalize
Axis Left Left Left Left
Comment 4 ohm 8 ohm
Sweep 1 1 Trace 1 2 Color Blue Cyan Line Style Solid Solid Thick 1 1 Data Anlr.Crosstalk Anlr.Crosstalk Axis Left Left Comment 4 ohm 4 ohm
A-A FREQ RESP.at2
A-A XTALK VS FREQ.at2
Fig.6 Frequency characteristics Frequency
Fig.7 Channel Separation v.s.
International Rectifier
T
100
4 Loading, Vcc = 25V, 30V, 40V, 50V, 60V
A-A THD+N vs FREQUENCY
02/27/04 18:39:45
International Rectifier
1 0.5 0.2 0.1 0.05 0.02
4 Loading, Vcc = 50V, 1W / 50W / 100W
A-A THD+N vs FREQUENCY
02/25/04 11:17:24
10
1 % 0.1 %
0.01 0.005 0.002 0.001 0.0005
0.01
0.001 100m
200m
500m
1
2
5 W
10
20
50
100
200
600
0.0002 0.0001 20 50 100 200 500 Hz
Sweep 1 2 3 Trace 1 1 1 Color Blue Red Magenta Line Style Solid Solid Solid Thick 1 1 1 Data Anlr.THD+N Ratio Anlr.THD+N Ratio Anlr.THD+N Ratio Axis Left Left Left Comment rev.3.3, 1W, 4 ohm 50W 100w
1k
2k
5k
10k
20k
Sweep 1 2 3 4 5
Trace 1 1 1 1 1
Color Yellow Red Magenta Blue Cyan
Line Style Solid Solid Solid Solid Solid
Thick 2 2 2 2 2
Data Anlr.THD+N Ratio Anlr.THD+N Ratio Anlr.THD+N Ratio Anlr.THD+N Ratio Anlr.THD+N Ratio
Axis Left Left Left Left Left
Comment 30v 25v 40v 50v 60v
A-A THD+N VS power.at2
A-A THD+N VS FREQ.at2
Fig.8 THD+N v.s. Output Power
Fig.9 THD+N v.s. Frequency (4)
International Rectifier
+0 -20 -40 d B r A -100 -120 -140 10 20 50 -60 -80
A-A FFT SPECTRUM ANALYSIS
02/25/04 18:11:00
International Rectifier
+0 -20 -40 d B r A -100 -120 -140 -60 -80
A-A FFT SPECTRUM ANALYSIS
02/25/04 18:08:39
100
200
500 Hz
1k
2k
5k
10k
20k
10
20
50
100
200
500 Hz
1k
2k
5k
10k
20k
Sweep 1
Trace 1
Color Blue
Line Style Solid
Thick 1
Data Fft.Ch.1 Ampl
Axis Left
Comment 1V, 4 ohm, referenced to 30v
Sweep 1
Trace 1
Color Blue
Line Style Solid
Thick 1
Data Fft.Ch.1 Ampl
Axis Left
Comment 4 ohm, referenced to 30V
A-A FFT.at2
A-A FFT.at2
Fig.10 Spectrum (1kHz, 1V, 4, fSW=400KHz)
Fig.11 Residual Noise Spectrum (no signal, 4, fSW=400KHz)
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Efficiency v.s. Pow er (+-50V, Class D Stage)
100 95 90 85 80 75 70 65 60 55 50 0 100 200 P o w er (W ) 300 400
Typical Switching Waveforms
8o
4o
Vcc = 50V, fSW=400kHz
Fig.12 Efficiency v.s. Output Power
(a) 20v/div, 0.5S/div
(b) 20nS/div, Rising Edge (c) 20nS/div, Falling Edge Fig.13 Switching Waveform at Output Node (TP5)
(a) 50W / 4 1KHz, THD+N=0.0078% Fig.14 Distortion Waveform
(b) 352W / 4, 1KHz, THD+N=10%
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Schematic Diagrams
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IRAUDAMP1 Bill of Materials
Qty Manufacturer Manuf. Part# 2 IR 4 IR 3 IR 1 2 Lite-On 1 Trading USA, Inc. 12 Diodes Inc. 2 1 1 2 2 2 3 4 2 3 1 4 3 1 2 Phoenix Contact Phoenix Contact Panasonic Panasonic Panasonic Diodes Inc. Diodes Inc. Diodes Inc. CUI Inc Building Fasteners Building Fasteners Building Fasteners Building Fasteners
LTST-C150GKT
Designator U6,U7 Q6,Q5,Q8,Q7 D14,D16,D21 L2,L1 LED1
Part Type IR2011S IRFB23N15D MURS120DICT Heatsink 18uH LTST-C150GKT
IR2011S IRFB23N15D MURS120DICT
Description High and Low Side Driver N-Channel MOSFET fast recovery diode Heatsink inductor, T-106-2, t=37, AWG18 LED, SMD
1N4148W-7 1714971 1714984 2SB0789A0L 2SD0968A0L
D1,D2,D3,D4,D5,D1 7,D20,D23,D24,D25, 1N4148WDICT-ND D22,D99 J6,J5 J3 Q17 Q18,Q19 U99,U98 Z5,Z1 D15,Z3,Z2 D19,Z6,D18,Z4 J1,J2 MKDS5/2-9.5 MKDS5/3-9.5 2SB789A 2SD968A UNR4223 24V 51V 5.6V CP-1418-ND Washer Screw Screw Screw U11 U12,U1 L3 D9,D6,D7,D8,D26 Q10,Q9,Q16 Q14,Q15,Q2,Q3,Q4, Q1 Q12 U13,U14 LM2594HVM-ADJ LT1220CS8 330uH
DIODE terminal 2P terminal 3P 2SB789A, SMD 2SD968A, SMD UNR4223, zener diode, SMD zener diode zener diode, SMD CONN_RCA JACK washer lock int tooth #8 zinc Screw, 4-40 Philips, L=0.5" 6-32 x 1/4, Philips Screw, M4 Philips, L=12mm Step-Down Voltage Regulator OP AMP inductor, SMD
UNR4223
BZT52C24-7 BZT52C51-7 BZT52C5V6-7 RCJ-041 INT LWZ 008 PMS 440 0050 PH PMS 632 0025 PH MPMS 004 0012 PH
National LM2594HVM-ADJ Semiconductor
LT1220CS8 PM3316-331M MA2YD2300L MMBT3904-7 MMBT5401 MMBT5551DICT-ND NJM78L05UA
Linear Technology J W Miller 1 Magnetics 5 Panasonic 3 Diodes Inc. 6 Diodes Inc. 1 Diodes Inc. 2 NJR
MA2YD23 DIODE MMBT3904DICT-ND 2N3904, SMD MMBT5401DICT-ND 2N5401, SMD MMBT5551DICT-ND 2N5551, SMD Positive Voltage NJM78L05UA-ND Regulator
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Qty Manufacturer Manuf. Part# 1 NJR 2 Panasonic 6 Panasonic 3 Panasonic 7 Panasonic 12 Panasonic 5 Panasonic 2 2 2 3 1 2 4 Panasonic Panasonic Panasonic Panasonic Panasonic Panasonic Panasonic
NJM78M09FA ERJ-6GEYJ102V ERJ-6GEYJ101V ERJ-6GEYJ104V ERJ-6GEYJ100V ERJ-6GEYJ103V ERJ-6GEYJ223V ERJ-6GEYJ334V ERJ-6GEYJ4R7V ERJ-6GEYJ471V ERJ-6GEYJ473V ERJ-6GEYJ681V ERJ-6GEYJ561V ERJ-6GEYJ9R1V ECJ-2VB1H103K ECJ-2VB1E104K ECJ-3YB1C105K ECJ-3VB1E334K ECJ-2VC2A221J ECJ-2VC2A102J ECJ-2VB1H102K ECJ-3YB2A104K ECJ-2FB1C105K ECJ-2VB1H272K ECE-V1CS100SR ECE-V1CA101WP ECE-V1EA470UP ECW-U1224KC9 ERJ-1TYJ103U ERJ-1TYJ100U ERJ-1TYJ221U ST32TB102
Designator U10 R7,R99 R17,R25,R23,R24,R 80,R98 R43,R41,R42 R47,R19,R66,R48,R 64,R66,R81 R70,R43,R18,R20,R 12,R14,R13,R65,R83 ,R82,R63,R67 R68,R69,R30,R29,R 28 R8,R9 R49,R51 R35,R36 R71,R77,R78 R46 R84,R85 R32,R31,R50,R52 C27,C25,C14,C15,C 12,C13,C54,C53,C99 ,C98 C57,C10,C8 C16,C45,C44 C24,C23 C1,C2 C20,C21,C17,C18 C63 C28,C26 C11,C9 C84
Part Type NJM78M09FA-ND 1K 100 100K 10 10K 22K 330K 4.7 470 47K 680 560 9.1 0.01uF, 50V 0.1uF, 25V 1uF, 16V 0.33uF, 25V 220pF, 100V 1000pF, 100V 1000pF, 50V 0.1uF, 100V 1uF, 16V 2.7nF, 50V
Description Positive Voltage Regulator resistor, 0805 resistor, 0805 resistor, 0805 resistor, 0805 resistor, 0805 resistor, 0805 resistor, 0805 resistor, 0805 resistor, 0805 resistor, 0805 resistor, 0805 resistor, 0805 resistor, 0805 capacitor, 0805 capacitor, 0805 capacitor, 1206 capacitor, 1206 capacitor, 0805 capacitor, 0805 capacitor, 0805 capacitor, 1206 capacitor, 0805 Capacitor, 50v, 0805 aluminum cap, SMD aluminum cap, SMD aluminum cap, SMD capacitor, 2820 resistor, 2512 resistor, 2512 resistor, 2512 POTENTIOMETER
10 Panasonic 3 3 2 2 4 1 2 2 Panasonic Panasonic Panasonic Panasonic Panasonic Panasonic Panasonic Panasonic
1 Panasonic 5 Panasonic 3 Panasonic 3 Panasonic 4 3 3 2 Panasonic Panasonic Panasonic Panasonic BC 2 Components
C59,C60,C29,C43,C 10uF, 16V 42 C56,C58,C55 C62,C48,C61 C31,C36,C32,C35 R34,R74,R33 R61,R62,R76 R73,R72 R26,R27 100uF, 16V 47uF, 25V 0.22uF, 100V 10K, 1W 10, 1W 220, 1W 1K
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Qty Manufacturer Manuf. Part# BC ST32TB502 2 Components TC7WH04FU(TE12L) 2 Toshiba 2 Toshiba 1 Panasonic 1
TC7WH08FU(TE12L) XN0431400L
Designator R22,R21 U3,U2 U5,U4 Q13 RLY1 Q11
Part Type 5K TC7WH04FU TC7WH08FU XN04314 SP Relay ZXMN2A01 Flat Washer
Description POTENTIOMETER TRIPLE INVERTER DUAL 2-INPUT AND GATE NPN-PNP Transistor DPST-NO RELAY, 15A MOSFET, Nch flat washer for heat sink spacer resistor, 2010 resistor, 2010 aluminum cap aluminum cap SPDT 3P Switch power resistor, 2W Lock Washer, #4
Omron G4W-2214PUSHP-DC12 Electronics, Inc
ZXMN2A01FTA
1 Zetex Inc. 1 McMaster 2 Vishay / Dale 2 Vishay / Dale United Chemi2 Con United Chemi3 Con TYCO 1 ELECTRONIC S-EM/T&B 4 Vishay / Dale 4 2 AVX 2 AVX 4
SPC Technology
98370A009
CRCW20104642F100 CRCW20105621F100 SMG50VB10RM5X11LL SMG50VB10RM5X11LL TT11AG-PC-1 WSR-2 .05< 1% WLS-04-017-SZ BF074E0224J BF074E0474J 4880 CRCW20101001F100 8423 TNPW08051001BT9 TNPW08051002BT9 TNPW08051101BT9 TNPW08051022BT9 ERJ-6GEYJ682V SME63VB471M12X25LL
R1,R2 R10,R15 C46,C47 C3,C4,C5 S1
46.4K, 1W 5.62K, 1%, 1W 10uF, 50V 10uF, 50V switch
R38,R37,R75,R79 50mOHM, 2W Lock Washer C33,C37 C51,C52 0.22uF, 100V 0.47uF, 100V
Aavid Thermalloy
2 Vishay / Dale 4 HH Smith 2 2 1 1 2 Vishay / Dale Vishay / Dale Vishay / Dale Vishay / Dale Vishay / Dale United Chemi4 Con 1 1
R5,R3
R4,R6 R16,R11 R86 R87 R45,R44
capacitor, box capacitor, box To-220 mounting To-220 mounting kit kit, Type4880 1K, 1W, 1% resistor, 2010 standoff, HEX Standoff threaded, L=0.5" 1K, 0.1% resistor, 0805 10K, 0.1% resistor, 0805 1.10K resistor, 1%, 0806 10.2K resistor, 1%, 0805 6.8K resistor, 0805 aluminum cap Printed Wiring Board
C39,C40,C38,C41 470uF, 63V PWB
0
R40,R39,R53,R54,R 55,R57,R58,R59,R56 ,R60,C50,C49,C30,C 34,C22,C19,C7,C6,D 10,D11,D13,D12
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Inductor Spec
Part number: NPT0104 Inductance: 18uH Rated Current: 10A Core: T106-2, Micrometals Wire: AWG18, magnet wire # of Turns: 37 Finish: Varnished
Mechanical Dimensions:
PCB layout
(1.1) (0.15)
(0.5)
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Functional Allocation
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Mechanical Drawings
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IR WORLD HEADQUARTERS: 233 Kansas St., El Segundo, California 90245 Tel: (310) 252-7105 Data and specifications subject to change without notice. 2005 www.irf.com 21

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